Dry Eye Disease: Symptoms, Causes, Diagnosis and Treatment

Author: Dr Val Phua
Estimated reading time: 20 minutes

Dry eye disease is a common condition in which the tear film does not adequately protect, lubricate or maintain the health of the eye’s surface.

The eyes may not produce enough tears, the tears may evaporate too quickly, or the tear film may become unstable because its water, oil and mucus components are not functioning properly.

Possible symptoms include:

Dryness
Burning or stinging
Grittiness
A sensation of sand in the eyes
Watery eyes
Redness
Light sensitivity
Tired or heavy eyes
Contact-lens discomfort
Blurred or fluctuating vision
Difficulty reading or using screens

Dry eye is not simply an inconvenience or a shortage of water in the eyes. It is a multifactorial ocular-surface disease involving tear-film instability, inflammation, nerve function, eyelid health and environmental factors.

The latest Tear Film and Ocular Surface Society international consensus, TFOS DEWS III, emphasises that dry eye may arise through several interacting mechanisms and that treatment should be tailored to the factors affecting the individual patient rather than using the same eyedrop for everyone.

Dry eye can range from mild, occasional discomfort to severe ocular-surface disease capable of causing:

Persistent pain
Corneal epithelial breakdown
Corneal infection
Scarring
Reduced vision
Difficulty functioning at work or home

Most patients can be helped, but successful treatment often requires identifying and addressing several contributing problems.

The Quick Answer

What Is Dry Eye Disease?

Dry eye disease occurs when the tear film cannot maintain a healthy, comfortable and optically smooth surface over the eye.

The problem may involve:

Insufficient watery tear production
Excessive tear evaporation
Poor meibomian oil quality
Eyelid inflammation
Incomplete blinking
Abnormal tear composition
Ocular-surface inflammation
Altered corneal nerve function
Environmental stress

Many patients have a combination of aqueous deficiency and evaporative dry eye rather than one pure subtype.

What Are the Most Common Symptoms?

Dry eye may cause:

Burning
Stinging
Grittiness
Foreign-body sensation
Redness
Watery eyes
Fluctuating blur
Vision that clears after blinking
Light sensitivity
Eye fatigue
Difficulty opening the eyes on waking
Discomfort in air-conditioned rooms
Reduced contact-lens wearing time

Symptoms may be worse:

At the end of the day
During screen use
In air conditioning
In windy or smoky environments
During prolonged reading
When using contact lenses
After eye surgery
When sleep is inadequate

Why Are My Eyes Watering if They Are Dry?

Dry eyes can trigger reflex tearing.

When the ocular surface becomes irritated, the lacrimal glands may release a sudden flow of watery tears. These reflex tears may lack sufficient oil and mucus to remain stable, so they spill over the eyelids without adequately correcting the underlying tear-film problem.

Watery eyes can therefore be a symptom of dry eye rather than proof that tear production is normal.

Can Dry Eye Affect Vision?

Yes.

The tear film is the first optical surface through which light passes.

An unstable tear film may cause:

Intermittent blur
Ghosting
Glare
Halos
Fluctuating astigmatism
Difficulty reading fine print
Poor-quality vision despite good eye-chart acuity

A typical clue is that vision briefly improves after blinking or applying lubricating drops.

Can Dry Eye Be Cured Permanently?

Some temporary forms resolve after the triggering factor is removed.

Chronic dry eye is often controlled rather than permanently cured, particularly when associated with:

Meibomian-gland dysfunction
Ageing
Autoimmune disease
Eyelid abnormalities
Long-term medication
Previous eye surgery
Reduced corneal sensation

Symptoms and ocular-surface health can often improve substantially with an individualised treatment plan.

Understanding the Tear Film

The Tear Film Is More Than Water

The tear film is a thin, complex layer covering the cornea and conjunctiva.

Its functions include:

Lubricating the eye
Creating a smooth optical surface
Delivering oxygen and nutrients
Washing away debris
Protecting against infection
Supporting corneal healing
Reducing friction during blinking

The Aqueous Component

The lacrimal glands produce the watery portion of tears.

It contains:

Water
Electrolytes
Proteins
Antimicrobial substances
Growth factors
Inflammatory regulators

Reduced aqueous production is an important feature of aqueous-deficient dry eye.

The Oily Component

The meibomian glands within the eyelids produce oil called meibum.

This oil spreads over the tear surface and:

Slows evaporation
Supports tear-film stability
Prevents tears from spilling too quickly
Reduces friction between the eyelids and eye

Poor meibomian-gland function is a major cause of evaporative dry eye.

The Mucin Component

Mucins are produced by conjunctival goblet cells and epithelial cells.

They help the watery tears spread evenly across the normally water-repellent corneal surface.

Mucin deficiency or epithelial disease may cause poor tear-film adherence and rapid break-up.

The Lacrimal Functional Unit

Tear production depends on communication between:

Corneal nerves
Conjunctiva
Lacrimal glands
Meibomian glands
Eyelids
Brainstem nerve pathways

A disturbance in one component may affect the others.

This is one reason dry-eye symptoms do not always match a single clinical test.

The Main Types of Dry Eye

Aqueous-Deficient Dry Eye

Aqueous-deficient dry eye occurs when the lacrimal glands do not produce enough watery tears.

Possible causes include:

Sjögren disease
Age-related lacrimal-gland dysfunction
Autoimmune disease
Scarring affecting the tear glands or ducts
Certain medications
Radiation
Severe inflammation
Reduced corneal nerve stimulation

Possible findings include:

Low tear volume
Reduced tear meniscus
Abnormal Schirmer test
Corneal and conjunctival staining
Filamentary keratitis in severe cases

Evaporative Dry Eye

Evaporative dry eye occurs when tears evaporate too quickly.

Common causes include:

Meibomian-gland dysfunction
Incomplete blinking
Reduced blink frequency
Eyelid malposition
Air conditioning
Wind
Contact-lens wear
Ocular rosacea
Eyelid inflammation

The eye may produce a reasonable volume of watery tears, but the tear film remains unstable because the protective oil layer is inadequate.

Mixed Dry Eye

Many patients have both aqueous-deficient and evaporative components.

For example, an older patient may have:

Reduced lacrimal secretion
Blocked meibomian glands
Incomplete blinking
Eyelid inflammation
Several drying medications

Treating only one component may produce incomplete relief.

Neuropathic Ocular Pain

Some patients experience severe burning, aching or light sensitivity even when visible ocular-surface signs are mild.

The discomfort may involve altered corneal nerve processing.

Possible features include:

Burning pain
Pain caused by light or wind
Symptoms out of proportion to staining
Pain that continues after topical anaesthetic
Coexisting migraine, fibromyalgia or chronic pain conditions

Neuropathic pain should not be dismissed as imagined. However, it may require a different management approach from ordinary tear deficiency.

Meibomian-Gland Dysfunction

What Are the Meibomian Glands?

The meibomian glands are vertically arranged oil glands within the upper and lower eyelids.

Their openings lie just behind the eyelashes.

Each complete blink helps release oil onto the tear film.

What Is Meibomian-Gland Dysfunction?

Meibomian-gland dysfunction, or MGD, occurs when the gland openings become blocked or the oil becomes abnormal.

The meibum may become:

Thick
Cloudy
Grainy
Waxy
Toothpaste-like
Difficult to express

MGD can cause:

Rapid tear evaporation
Burning
Grittiness
Fluctuating vision
Red eyelid margins
Foamy tears
Recurrent styes or chalazia
Contact-lens intolerance

Can Meibomian Glands Be Lost?

Long-standing MGD may lead to gland shortening, distortion or dropout.

Once a gland has been extensively lost, treatment cannot reliably regenerate it.

Early treatment aims to improve the function of the remaining glands and slow further deterioration.

Rosacea and MGD

Ocular rosacea may be associated with:

Facial flushing
Facial redness
Visible facial blood vessels
Lid-margin telangiectasia
Thick meibum
Recurrent chalazia
Corneal inflammation

Eye symptoms can be significant even when skin rosacea appears mild.

Common Symptoms

Dryness

Patients may describe the eyes as:

Dry
Tight
Dehydrated
Difficult to keep open
Uncomfortable on waking

Grittiness

A gritty sensation may feel like:

Sand
Dust
An eyelash
A contact lens stuck in the eye

Burning and Stinging

Burning may be caused by:

Tear hyperosmolarity
Surface inflammation
Preservative toxicity
Corneal epithelial damage
Nerve hypersensitivity

Watery Eyes

Reflex tearing may occur when the unstable surface repeatedly triggers sensory nerves.

Fluctuating Vision

Vision may:

Blur between blinks
Clear after blinking
Worsen during reading
Become less clear later in the day
Change during air-conditioned exposure

Light Sensitivity

Light sensitivity may occur with significant surface inflammation or nerve dysfunction.

Marked or sudden photophobia should be assessed because it can also indicate:

Corneal infection
Uveitis
Corneal abrasion
Acute inflammation inside the eye

Eye Fatigue

Dryness may make the eyes feel:

Heavy
Tired
Aching
Difficult to keep open

Stringy Mucus

Some patients develop mucus strands because of abnormal tear composition and ocular-surface irritation.

Contact-Lens Intolerance

Dry eye may cause:

Reduced wearing time
Lens awareness
Blurred vision
Deposits
Redness
End-of-day discomfort

Why Can Symptoms and Clinical Signs Differ?

Severe Symptoms With Mild Staining

Possible explanations include:

Early disease
Corneal nerve hypersensitivity
Neuropathic pain
Migraine
Symptoms fluctuating before the examination
Previous use of lubricants

Significant Staining With Few Symptoms

Reduced corneal sensation may occur with:

Diabetes
Herpes infection
Long-term contact-lens wear
Previous eye surgery
Neurotrophic keratopathy

A patient may therefore have substantial ocular-surface damage without severe discomfort.

TFOS DEWS III recommends combining symptom assessment with objective testing rather than relying on symptoms or one isolated measurement alone.

Risk Factors

Increasing Age

Tear production and meibomian-gland function may decline with age.

Ageing can be associated with:

Reduced lacrimal secretion
Meibomian-gland loss
Eyelid laxity
Incomplete closure
More medications
Greater systemic disease burden

Female Sex and Hormonal Factors

Dry eye is commonly reported more frequently in women.

Hormonal influences may affect:

Lacrimal glands
Meibomian glands
Immune regulation
Ocular-surface sensitivity

A recent global meta-analysis found substantial variation in prevalence depending on diagnostic criteria and population, with higher pooled rates among women than men.

Screen Use

Concentrated screen work can reduce complete blinking and increase tear evaporation.

Symptoms may worsen during:

Computer use
Smartphone use
Gaming
Prolonged reading
Online meetings

Contact Lenses

Contact lenses can alter tear distribution and increase evaporation.

Air Conditioning and Wind

Moving dry air increases tear evaporation.

Symptoms often worsen near:

Air-conditioning vents
Fans
Vehicle vents
Open windows
Outdoor wind

Smoking and Air Pollution

Smoke and airborne irritants can destabilise the tear film and increase inflammation.

Eyelid Disease

Blepharitis, Demodex infestation and MGD frequently coexist with dry eye.

Previous Eye Surgery

Dry eye may worsen temporarily or persist after:

LASIK
PRK
SMILE
Cataract surgery
Corneal transplantation
Eyelid surgery

Possible contributing mechanisms include:

Corneal nerve disruption
Inflammation
Eyedrop toxicity
Altered blinking
Pre-existing disease becoming symptomatic

Diabetes

Diabetes may affect:

Corneal sensation
Tear production
Epithelial healing
Meibomian glands
Blink function

Autoimmune Disease

Dry eye may occur with:

Sjögren disease
Rheumatoid arthritis
Systemic lupus erythematosus
Thyroid eye disease
Scleroderma
Graft-versus-host disease

Eyelid Malposition

Conditions such as:

Entropion
Ectropion
Incomplete eyelid closure
Facial-nerve weakness
Proptosis
Eyelid scarring

may prevent the eye from being adequately covered during blinking or sleep.

Medications

Medicines that may contribute include selected:

Antihistamines
Antidepressants
Anticholinergic medicines
Diuretics
Isotretinoin
Beta-blockers
Hormonal therapies
Sedatives
Glaucoma eyedrops containing preservatives

Do not stop prescribed medication without consulting the treating doctor.

Sjögren Disease

What Is Sjögren Disease?

Sjögren disease is an autoimmune condition in which the immune system targets moisture-producing glands.

It may cause:

Dry eyes
Dry mouth
Dental problems
Difficulty swallowing dry food
Joint pain
Fatigue
Salivary-gland swelling
Systemic complications

When Should Sjögren Disease Be Considered?

Investigation may be appropriate when dry eye is:

Severe
Clearly aqueous-deficient
Associated with dry mouth
Associated with autoimmune symptoms
Disproportionate to age
Accompanied by recurrent corneal damage

Diagnosis may involve:

Medical history
Blood tests
Salivary-gland assessment
Rheumatology review
Other specialised testing

A negative initial blood test does not exclude every case.

Environmental and Lifestyle Triggers

Screen Concentration

Incomplete blinking during screen use leaves part of the cornea exposed.

Sleep Deprivation

Poor sleep may worsen pain perception, inflammation and ocular comfort.

Dehydration

Severe dehydration may reduce tear availability, although simply drinking excessive water does not cure chronic MGD or autoimmune dry eye.

Makeup and Eyelid Products

Possible problems include:

Eyeliner blocking meibomian openings
Makeup debris
Contact allergy
Eyelash-extension adhesive
Inadequate makeup removal

Dietary Factors

A balanced diet supports general health.

No specific food has been proven to cure dry eye.

Large clinical trials have not shown high-dose oral omega-3 supplements to be consistently superior to placebo for treating established moderate-to-severe dry eye. Supplements may also interact with medication or affect bleeding risk.

How Is Dry Eye Diagnosed?

Symptom History

The clinician may ask about:

Burning
Grittiness
Watering
Fluctuating vision
Screen use
Contact-lens wear
Morning or evening symptoms
Autoimmune symptoms
Medication
Previous surgery
Environmental triggers

Symptom Questionnaires

Validated questionnaires may help measure:

Symptom frequency
Severity
Functional impact
Response to treatment

Examples include:

Ocular Surface Disease Index
Dry Eye Questionnaire
Standard Patient Evaluation of Eye Dryness

A questionnaire cannot determine the underlying cause on its own.

Slit-Lamp Examination

The slit lamp allows examination of:

Tear volume
Tear debris
Eyelid margins
Meibomian glands
Conjunctiva
Cornea
Blink completeness
Eyelid closure

Tear-Film Break-Up Time

This test measures how long the tear film remains stable after a blink.

Rapid break-up supports tear-film instability.

The test may be performed using:

Fluorescein dye
Non-invasive imaging

Corneal and Conjunctival Staining

Dyes such as fluorescein or lissamine green highlight areas of damaged or stressed epithelial cells.

The staining pattern may provide clues about:

Exposure
Aqueous deficiency
Medication toxicity
Eyelid-related trauma
Contact-lens effects

Schirmer Test

A small paper strip is placed near the lower eyelid to estimate tear production.

The result must be interpreted in clinical context because reflex tearing and testing conditions can affect the measurement.

Tear Osmolarity

Dry-eye tears may become abnormally concentrated.

Osmolarity testing can support the diagnosis but should not be interpreted alone.

Inflammatory-Marker Testing

Some clinics test tear markers associated with ocular-surface inflammation.

These tests may help guide management in selected patients.

Meibomian-Gland Expression

Gentle pressure is used to assess:

Whether the glands express
The quality of the oil
The number of functioning glands
Whether secretions are clear or thickened

Meibography

Infrared meibography images the glands through the eyelids.

It may show:

Gland shortening
Distortion
Dilatation
Dropout

Blink Assessment

Incomplete blinking can be observed clinically or using imaging.

Corneal Sensation

Reduced or abnormal sensation may indicate:

Neurotrophic disease
Herpetic damage
Diabetes
Postsurgical nerve change
Neuropathic pain

Conditions That Can Resemble Dry Eye

Allergy

Allergy commonly causes:

Prominent itching
Watery discharge
Eyelid swelling
Seasonal symptoms

Dry eye and allergy may coexist.

Blepharitis

Blepharitis causes inflammation and debris along the eyelid margins and often contributes to evaporative dry eye.

Corneal Infection

A corneal ulcer may cause:

Pain
Redness
Light sensitivity
Reduced vision
A white corneal spot

This requires urgent treatment.

Recurrent Corneal Erosion

Recurrent erosion often causes sudden severe pain on waking.

Uveitis

Uveitis may cause:

Deep eye pain
Marked light sensitivity
Redness
Blurred vision
Floaters

Thyroid Eye Disease

Exposure from eyelid retraction or proptosis can produce severe surface dryness.

Neuropathic Pain or Migraine

Persistent burning and light sensitivity may have a significant neurological component.

Treatment Principles

Treat the Cause, Not Only the Symptom

Dry-eye management may need to address:

Tear deficiency
Excessive evaporation
Eyelid inflammation
Meibomian-gland obstruction
Allergy
Medication toxicity
Exposure
Autoimmune disease
Nerve dysfunction

TFOS DEWS III recommends a personalised, mechanism-based approach combining tear supplementation, tear conservation, stimulation of natural secretion, anti-inflammatory treatment and management of eyelid or environmental contributors.

Treatment Often Requires Time

Some measures provide immediate lubrication.

Treatments aimed at inflammation or gland function may take:

Several weeks
Several months
Repeated sessions

Dry eye should not be judged only by how the eyes feel after the first few doses.

Environmental Changes

Redirect Moving Air

Avoid fans or air-conditioning vents blowing directly towards the eyes.

Use a Humidifier

A humidifier may help in a persistently dry indoor environment.

It must be cleaned correctly to avoid microbial contamination.

Wear Protective Glasses

Wraparound glasses or moisture-chamber spectacles may reduce wind exposure and evaporation.

Adjust Screen Position

A screen slightly below eye level reduces the area of exposed ocular surface.

Take Visual Breaks

Look away regularly and perform slow, complete blinks.

Improve Sleep and General Health

Adequate sleep, regular exercise and management of systemic disease may improve symptom tolerance and overall health.

Artificial Tears

What Do Artificial Tears Do?

Artificial tears may:

Lubricate the eye
Dilute inflammatory material
Improve optical smoothness
Reduce friction
Provide temporary symptom relief

Preservative-Free Drops

Preservative-free drops may be preferable when:

Drops are needed frequently
The ocular surface is damaged
Several eyedrops are used
The patient has preservative sensitivity
Contact lenses are worn
Eye surgery is planned

Different Drop Formulations

Products may contain:

Hyaluronic acid
Carboxymethylcellulose
Hydroxypropyl guar
Lipid components
Osmoprotectants
Emulsions
Ointment bases

There is no single best artificial tear for every patient.

Lipid-Based Drops

Lipid-containing products may be useful for evaporative dry eye or MGD.

Gels and Ointments

Thicker preparations remain on the eye longer.

They may be useful:

At bedtime
For exposure
For severe aqueous deficiency

They may temporarily blur vision.

Avoid “Get-the-Red-Out” Drops

Vasoconstrictor drops reduce redness temporarily but do not treat the dry-eye mechanism and may cause rebound redness or irritation.

Warm Compresses and Eyelid Care

Warm Compresses

Warmth may soften thickened meibum and improve its flow.

A practical routine may involve:

Applying a clean heated mask or warm compress.
Maintaining comfortable warmth for several minutes.
Following with gentle massage when advised.
Repeating regularly.

Purpose-designed warming devices generally maintain temperature more reliably than a wet cloth that cools rapidly. A 2025 systematic review supported eyelid warming as a reasonable first-step treatment for MGD, although techniques and outcomes vary.

Eyelid Massage

Massage should direct secretions towards the gland openings without forcefully pressing on the eyeball.

Eyelid Cleansing

Cleansing may help when there is:

Crusting
Blepharitis
Demodex-related debris
Makeup accumulation

Avoid aggressive scrubbing and products that irritate the ocular surface.

Demodex Treatment

Characteristic collarettes around the lash bases may indicate Demodex blepharitis.

Targeted treatment may be required rather than routine warm compresses alone.

Prescription Anti-Inflammatory Treatment

Short-Term Corticosteroid Drops

A monitored short course may reduce significant inflammation.

Potential risks include:

Raised eye pressure
Cataract progression in a natural lens
Delayed healing
Increased infection risk
Worsening of herpes or fungal disease

Steroid drops should not be self-started.

Ciclosporin

Topical ciclosporin reduces immune-mediated ocular-surface inflammation and may improve tear production in selected patients.

Treatment may take weeks or months to produce its full effect.

Temporary burning or stinging is common.

Lifitegrast

Lifitegrast is an anti-inflammatory dry-eye treatment available in some countries.

Possible adverse effects include:

Irritation
Altered taste
Temporary blur

Treatment of Meibomian-Gland Dysfunction

In-Office Gland Expression

Controlled expression may remove obstructed meibum.

It is often combined with heat or other treatment.

Thermal Pulsation

Thermal-pulsation systems apply controlled heat and pressure to the eyelids.

They aim to:

Liquefy thick secretions
Open obstructed glands
Improve meibum quality

A 2025 meta-analysis found improvements in several MGD-related outcomes, while noting that long-term benefit and the patients most likely to respond require further clarification.

Intense Pulsed Light

Intense pulsed light, or IPL, is applied to the skin around the eyelids using appropriate eye protection.

Possible mechanisms include:

Heating meibomian secretions
Reducing abnormal surface vessels
Modulating inflammation
Improving rosacea-associated disease

A systematic review of randomised trials found that IPL probably improves symptoms compared with placebo, although the magnitude of additional benefit and adverse-effect evidence vary among studies.

IPL may not be suitable for every skin type, medical condition or medication profile.

Other Device-Based Treatments

Options may include:

Controlled eyelid heating
TearCare-type systems
Low-level light therapy
Lid-margin debridement
Microblepharoexfoliation

Evidence, availability and cost differ.

Oral Medication for MGD and Rosacea

Doxycycline

Low-dose or standard-dose doxycycline may be used for selected patients with:

Ocular rosacea
Significant MGD
Recurrent chalazia
Corneal inflammation

Its benefits may relate partly to anti-inflammatory and anti-enzyme effects.

Possible adverse effects include:

Stomach upset
Oesophageal irritation
Sun sensitivity
Drug interactions

It is unsuitable for certain patients, including during pregnancy.

Azithromycin

Oral or topical azithromycin may be used in selected circumstances.

Treatment should be prescribed according to the patient’s medical and ocular history.

Punctal Plugs

What Are the Puncta?

The puncta are small drainage openings near the inner corners of the eyelids.

Tears normally drain through them into the nose.

How Do Plugs Help?

A punctal plug partly blocks drainage so natural and artificial tears remain on the eye longer.

Who May Benefit?

Plugs may be considered for:

Moderate or severe aqueous-deficient dry eye
Persistent symptoms despite lubrication
Selected postsurgical patients
Patients requiring frequent artificial tears

A 2025 systematic review and meta-analysis found improvements in symptoms and several tear-film measurements after plug placement, although real-world benefit depends on correct patient selection.

Why Should Inflammation Be Controlled First?

Blocking drainage may retain inflammatory tears on the ocular surface.

Significant active inflammation is often treated before or alongside punctal occlusion.

Possible Problems

Potential complications include:

Watering
Irritation
Plug loss
Plug migration
Canalicular infection
Granuloma
Difficulty removing an intracanalicular plug

Punctal Cautery

Permanent closure may be considered in severe aqueous deficiency when temporary plugs repeatedly fall out or fail.

Autologous Serum and Blood-Derived Drops

What Are Autologous Serum Tears?

Autologous serum drops are produced from the patient’s own blood.

The serum is diluted and prepared under controlled conditions.

It contains biological components that may support:

Epithelial healing
Nerve health
Surface lubrication
Tear-film stability

Who May Need Them?

They may be considered for:

Severe dry eye
Sjögren disease
Persistent epithelial defects
Neurotrophic keratopathy
Graft-versus-host disease
Failure of conventional treatment

A 2024 meta-analysis of randomised trials reported improvements in symptoms, tear stability and ocular-surface staining compared with artificial tears, although preparation protocols vary.

Storage and Handling

Because serum drops contain biological material, patients must follow strict instructions regarding:

Freezing
Refrigeration
Expiry
Avoiding contamination

Scleral Contact Lenses

What Is a Scleral Lens?

A scleral lens is a large rigid lens that rests on the white part of the eye and vaults over the cornea.

The space beneath the lens is filled with sterile preservative-free fluid.

How Can It Help?

A scleral lens may:

Protect the cornea
Maintain a fluid reservoir
Reduce friction
Improve vision over an irregular surface
Reduce pain in severe disease

Who May Benefit?

Possible indications include:

Severe dry eye
Sjögren disease
Graft-versus-host disease
Exposure keratopathy
Neurotrophic disease
Irregular corneal scarring

Current evidence supports scleral lenses as a valuable option for selected severe cases, but fitting, handling, oxygen transmission and infection risk require professional supervision.

Amniotic Membrane and Severe-Surface Treatment

Amniotic Membrane

A temporary amniotic membrane may support healing in severe ocular-surface disease.

It may be used for:

Persistent epithelial defects
Neurotrophic keratopathy
Severe inflammation
Significant corneal staining

Moisture-Chamber Protection

Night-time moisture goggles or eyelid taping may be useful when the eyes do not close fully during sleep.

Taping should be taught properly to avoid injury.

Tarsorrhaphy

Partial eyelid closure may be required for severe exposure or neurotrophic disease.

Corneal Surgery

Rarely, severe untreated or autoimmune dry-eye disease may lead to:

Corneal melting
Perforation
Emergency grafting

The underlying systemic inflammation must also be treated.

Dry Eye and Contact Lenses

Can You Wear Contact Lenses With Dry Eye?

Many patients can, but the lens type and wearing schedule may need modification.

Possible strategies include:

Shorter wearing time
Daily disposable lenses
Different lens material
Improved fit
Preservative-free lubrication
Treating MGD before refitting
Alternating with glasses

When Should Lenses Be Removed?

Remove the lenses and seek urgent assessment for:

Pain
Significant redness
Light sensitivity
Discharge
Reduced vision
A white corneal spot

These symptoms may indicate corneal infection rather than routine dryness.

Never Use Tap Water

Contact lenses should not be rinsed, stored or handled with water.

Dry Eye and Digital Screens

Why Screens Worsen Symptoms

During concentrated screen use, people often blink:

Less frequently
Less completely

This increases exposure and evaporation.

Practical Screen Measures

Place the monitor slightly below eye level.
Enlarge text rather than leaning closer.
Look away regularly.
Perform complete blinks.
Redirect air vents.
Use prescribed lubricants.
Take genuine screen-free breaks.

Dry Eye Before Cataract or Refractive Surgery

Why Does Dry Eye Affect Surgical Measurements?

The tear film affects:

Keratometry
Corneal topography
Astigmatism measurement
Intraocular-lens calculations
Higher-order aberration analysis

An unstable tear film can produce inconsistent readings.

Surgery May Be Delayed

Elective surgery may be postponed when:

Measurements are not repeatable
Corneal staining is significant
MGD is uncontrolled
The patient has active eyelid inflammation
Visual expectations are high

Dry Eye May Affect Premium-Lens Satisfaction

Multifocal, trifocal and EDOF lenses are sensitive to optical imperfections.

Untreated dry eye may cause:

Halos
Glare
Poor reading quality
Fluctuating vision
Dissatisfaction despite technically successful surgery

Optimising the surface before final measurements is particularly important for toric and presbyopia-correcting lenses.

Dry Eye After Cataract Surgery

Why Can Symptoms Worsen?

Possible reasons include:

Corneal nerve disruption
Postoperative inflammation
Antiseptic exposure
Eyedrop preservatives
Reduced blinking
Pre-existing MGD
Temporary surface irregularity

How Long Does It Last?

Many patients improve as the eye heals.

Those with pre-existing dry eye may require longer or more intensive treatment.

Persistent Blur Should Be Assessed

Do not assume all postoperative blur is dry eye.

Other causes include:

Residual prescription
Corneal swelling
Inflammation
Macular oedema
Lens-position problems
Posterior capsule opacification

Dry Eye in Children

Can Children Develop Dry Eye?

Yes.

Contributing factors may include:

Screen use
Allergy
Blepharitis
MGD
Contact lenses
Autoimmune disease
Medication
Incomplete blinking

Possible Signs

Children may:

Rub their eyes
Blink excessively
Complain of burning
Avoid reading
Have watery or red eyes
Hold screens closely
Struggle with contact lenses

Persistent symptoms should not be treated indefinitely without examination.

Dry Eye During Pregnancy

Hormonal changes may affect tear-film stability.

Treatment should prioritise options with an appropriate pregnancy safety profile.

Discuss:

Prescription drops
Oral antibiotics
Supplements
Procedures

with the ophthalmologist and obstetric doctor.

Why Treatment Sometimes Fails

The Diagnosis Is Incomplete

Dry eye may coexist with:

Allergy
Demodex
Neuropathic pain
Recurrent erosion
Exposure
Autoimmune disease

Treatment Is Inconsistent

Warm compresses and anti-inflammatory drops require regular use.

The Product Is Wrong for the Mechanism

A watery artificial tear may give limited relief when the main problem is severe MGD or exposure.

Preservatives Are Worsening the Surface

Frequent preserved drops may cause toxicity.

An Eyelid Problem Remains Untreated

Dry-eye treatment may fail when:

The eyelids do not close
Lashes rub the cornea
Glands remain obstructed
Significant blepharitis persists

Symptoms Are Partly Neuropathic

More lubrication alone may not resolve nerve-related pain.

What Not to Do

Do Not Use Steroid Drops Without Supervision

Steroids may worsen:

Herpes infection
Fungal infection
Bacterial infection

They may also raise eye pressure.

Do Not Assume Every Red Eye Is Dry Eye

A painful, red, light-sensitive eye requires examination.

Do Not Overuse Vasoconstrictor Drops

Redness-relief drops do not treat the underlying disease.

Do Not Apply Essential Oils Into the Eye

Undiluted tea tree oil and other concentrated products can cause chemical injury.

Do Not Wash Contact Lenses With Water

This increases the risk of serious microbial keratitis.

Do Not Ignore Persistent One-Sided Symptoms

Dry eye is commonly bilateral, although severity may differ.

Persistent unilateral symptoms may indicate:

Foreign body
Eyelid abnormality
Infection
Nerve problem
Tear-drainage disease
Another ocular condition

When to Seek Urgent Review

Seek urgent same-day assessment for:

Significant eye pain
Sudden or persistent reduction in vision
Marked redness
Severe light sensitivity
A white spot on the cornea
Thick discharge
Recent eye injury
A painful red eye in a contact-lens wearer
Inability to open the eye
Rapidly worsening symptoms
New flashes, numerous floaters or a curtain

Dry eye usually causes fluctuating discomfort rather than sudden severe visual loss.

Common Myths

“Dry Eye Means I Do Not Produce Any Tears”

False.

Many patients produce tears but lose them too quickly because of poor meibomian oil or incomplete blinking.

“Watery Eyes Cannot Be Dry”

False.

Reflex watering is common in dry eye.

“All Artificial Tears Are the Same”

False.

Drops vary in viscosity, lipid content, preservatives and active ingredients.

“More Drops Always Mean Better Treatment”

False.

The underlying mechanism must be treated. Frequent preserved drops may worsen surface toxicity.

“Blue-Light Glasses Cure Screen-Related Dry Eye”

False.

Blinking, screen position, tear-film health and environmental airflow are more important.

“Omega-3 Supplements Cure Dry Eye”

Evidence is mixed. The large DREAM trial did not demonstrate superiority of high-dose omega-3 supplementation over placebo for established dry eye.

“Dry Eye Cannot Damage Vision”

Severe disease may cause epithelial breakdown, infection, scarring or perforation.

Frequently Asked Questions

How Common Is Dry Eye?

Dry eye is common, but prevalence estimates vary widely because studies use different definitions, questionnaires and tests. Recent global analyses confirm that it represents a major public-health burden.

Why Is Dry Eye Worse at Night?

Possible reasons include:

Accumulated environmental exposure
Prolonged screen use
Contact-lens wear
Reduced blinking
Evaporation
Medication wearing off

Why Is Dry Eye Worse in the Morning?

Morning symptoms may indicate:

Incomplete eyelid closure during sleep
Nocturnal exposure
Recurrent corneal erosion
Thickened eyelid secretions
Ointment-related blur

Can Dry Eye Cause Headaches?

Dry-eye discomfort and fluctuating vision may contribute to visual strain.

Persistent headaches may also involve:

Migraine
Uncorrected prescription
Binocular-vision problems
Neck strain

Can Dry Eye Cause Floaters?

No.

Floaters arise from the vitreous gel inside the eye.

New flashes, numerous floaters or a curtain require urgent retinal examination.

Can Dry Eye Cause Double Vision?

An irregular tear film can cause monocular ghosting or overlapping images.

True binocular double vision that disappears when either eye is covered requires assessment for an alignment or neurological cause.

Can Drinking More Water Cure Dry Eye?

Adequate hydration is sensible, but chronic dry eye usually requires more than increasing water intake.

Can Dry Eye Cause Permanent Damage?

Mild disease generally does not.

Severe uncontrolled disease can cause:

Persistent epithelial defects
Infection
Scarring
Corneal thinning
Visual loss

How Often Can I Use Artificial Tears?

The safe frequency depends on the formulation.

Preservative-free drops are often preferred when frequent use is required.

Can Punctal Plugs Make Dry Eye Worse?

They may worsen watering or retain inflammatory tears in poorly selected patients.

Inflammation should be assessed and treated appropriately.

Is IPL Better Than Thermal Pulsation?

Both can help selected MGD patients.

The better option depends on:

Gland obstruction
Rosacea
Skin type
Eyelid findings
Previous treatment
Availability and cost

Evidence does not support one procedure as universally best for everyone.

Do Meibomian Glands Grow Back?

Extensively lost glands do not reliably regenerate.

Treatment aims to preserve and improve the function of remaining glands.

Can Dry Eye Return After Treatment?

Yes.

Maintenance may be required because ageing, gland dysfunction, autoimmune disease and environmental exposure continue.

A Practical Daily Dry-Eye Routine

Morning

Apply prescribed drops.
Clean the eyelid margins when advised.
Use a warm compress if MGD is present.
Avoid directing a fan towards the face.

During Work

Blink completely.
Look away regularly.
Place the screen below eye level.
Use prescribed lubricants.
Reduce contact-lens wearing time when uncomfortable.
Avoid sitting directly below strong air-conditioning.

Evening

Remove eye makeup thoroughly.
Remove contact lenses on schedule.
Repeat warm compresses when prescribed.
Use gel or ointment at bedtime when advised.
Avoid rubbing the eyes.

Long-Term

Attend follow-up.
Review systemic medication.
Manage rosacea, allergy and autoimmune disease.
Use preservative-free products when appropriate.
Report new pain, redness or reduced vision promptly.

A Dry-Eye Assessment Checklist

Symptoms

Burning
Grittiness
Watering
Fluctuating vision
Light sensitivity
Morning discomfort
Contact-lens intolerance
Screen-related worsening

Possible Contributors

MGD
Blepharitis
Demodex
Allergy
Autoimmune disease
Medication
Previous surgery
Incomplete blinking
Eyelid malposition
Environmental airflow

Tests That May Be Useful

Tear break-up time
Corneal staining
Conjunctival staining
Tear-volume assessment
Schirmer testing
Meibomian-gland expression
Meibography
Corneal sensation
Tear osmolarity
Inflammatory-marker testing

Questions to Ask

Is my dry eye mainly aqueous-deficient or evaporative?
Do I have MGD?
Are my eyelids closing completely?
Are preservatives contributing?
Do I need anti-inflammatory treatment?
Are punctal plugs suitable?
Would a device-based treatment help?
Should autoimmune disease be investigated?
Is the ocular surface stable enough for surgery?

The Bottom Line

Dry eye disease occurs when the tear film cannot maintain a healthy, comfortable and optically smooth ocular surface.

The main mechanisms include:

Inadequate tear production
Excessive evaporation
Meibomian-gland dysfunction
Eyelid disease
Incomplete blinking
Inflammation
Abnormal corneal nerve function

Common symptoms include:

Dryness
Burning
Grittiness
Watering
Redness
Fluctuating vision
Light sensitivity
Eye fatigue
Contact-lens discomfort

Diagnosis requires more than asking whether the eyes feel dry.

A proper assessment may examine:

Tear stability
Tear volume
Corneal staining
Eyelid margins
Meibomian glands
Blinking
Corneal sensation
Systemic risk factors

Treatment may include:

Environmental modification
Preservative-free artificial tears
Lipid-based drops
Warm compresses
Eyelid hygiene
Prescription anti-inflammatory drops
MGD procedures
Punctal plugs
Autologous serum
Scleral lenses
Treatment of autoimmune or eyelid disease

Dry eye can often be controlled successfully, but there is rarely one treatment that works for every patient.

The most useful question is not simply:

“Which dry-eye drop should I buy?”

It is:

“Why is my tear film unstable, and which combination of treatments addresses the causes affecting my eyes?”

References

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