Author: Dr Val Phua
Estimated reading time: 14–16 minutes
What Is Eye Pain?
Eye pain refers to discomfort arising from the eye, eyelids, tissues surrounding the eye or nerves that carry visual and pain signals.
Patients may describe it as:
- Burning
- Stinging
- Grittiness
- Scratching
- A foreign-body sensation
- Sharp or stabbing pain
- Deep aching
- Throbbing
- Pressure behind the eye
- Pain when moving the eye
- Brow or temple pain
- Tenderness around the eye
Eye pain is a symptom rather than a diagnosis.
Some causes are mild and temporary, such as dry eye or eyelid inflammation. Others—including corneal infection, acute angle closure, uveitis, scleritis, orbital infection and optic-nerve inflammation—can threaten sight or general health.
Severe pain, light sensitivity, marked redness or any change in vision should receive urgent assessment.
Why Can a Small Eye-Surface Problem Be So Painful?
The cornea is the clear window at the front of the eye.
It contains a very high concentration of sensory nerve endings. Even a small scratch, loose epithelial area or embedded foreign body may therefore cause:
- Severe pain
- Reflex eyelid closure
- Watering
- Light sensitivity
- Difficulty opening the eye
The severity of pain does not always match the physical size of the injury.
Conversely, some serious retinal or optic-nerve conditions may cause visual loss with little or no pain.
Where Does the Pain Seem to Come From?
The location and character of the pain provide useful clues.
Surface Burning or Grittiness
More commonly associated with:
- Dry eye
- Blepharitis
- Allergy
- Conjunctivitis
- Contact-lens irritation
- Minor corneal surface disease
Sharp Pain or Foreign-Body Sensation
More commonly associated with:
- Corneal abrasion
- Retained foreign body
- Recurrent corneal erosion
- Corneal infection
- Loose or damaged contact lens
- An eyelash rubbing the cornea
Deep Aching or Throbbing Pain
May occur with:
- Uveitis
- Scleritis
- Acute angle closure
- Severe corneal inflammation
- Orbital inflammation
- Postoperative complications
Pain When Moving the Eye
May suggest:
- Optic neuritis
- Orbital cellulitis
- Thyroid eye disease
- Orbital inflammation
- Eye-muscle or orbital injury
Pain Around or Behind the Eye
May arise from:
- Migraine
- Cluster headache
- Sinus disease
- Optic neuritis
- Scleritis
- Thyroid eye disease
- Orbital disease
- Referred facial or nerve pain
The perceived location alone cannot confirm the diagnosis.
Is Eye Pain an Emergency?
Not every episode requires emergency treatment.
However, certain combinations are particularly concerning.
Seek Emergency Eye or Medical Care Immediately For
- Sudden severe eye pain
- Sudden loss or marked reduction of vision
- A painful red eye with blurred vision
- Severe light sensitivity
- Halos around lights with headache, nausea or vomiting
- Chemical exposure
- Penetrating or high-velocity injury
- A contact-lens wearer with pain, redness or reduced vision
- Severe pain or worsening vision after eye surgery or an eye injection
- Eyelid swelling with fever, painful eye movements or a bulging eye
- Eye pain with facial weakness, speech difficulty or other neurological symptoms
- A new headache, scalp tenderness or jaw pain with visual symptoms in someone over 50
Reduced visual acuity, moderate-to-severe pain, headache and photophobia are recognised red flags requiring urgent ophthalmic assessment.
Why Do Vision Changes Make Eye Pain More Concerning?
Pain combined with reduced vision suggests that the condition may involve:
- The cornea
- The anterior chamber
- Eye pressure
- The optic nerve
- The orbit
- A postoperative complication
- A serious infection or inflammation
Simple eyelid irritation or mild conjunctivitis should not ordinarily cause significant loss of vision.
A painful eye with true visual reduction should not be managed solely using over-the-counter redness drops or leftover medication.
Common Causes of Eye Pain
Dry Eye Disease
Dry eye commonly causes:
- Burning
- Stinging
- Grittiness
- Tired or heavy eyes
- Intermittent blur
- Watering
- Discomfort during screen use
- Sensitivity to wind or air conditioning
Symptoms often:
- Affect both eyes
- Fluctuate through the day
- Temporarily improve after blinking
- Worsen with prolonged visual concentration
- Improve with appropriate lubrication
Severe ocular-surface dryness or abnormal corneal nerve sensitivity can sometimes cause substantial pain despite limited visible staining. Dry eye can also produce pain, redness and fluctuating visual symptoms.
Blepharitis and Meibomian Gland Dysfunction
Inflammation or blockage of the eyelid oil glands may cause:
- Burning
- Grittiness
- Sore eyelid margins
- Crusts around the eyelashes
- Recurrent styes
- Foamy tears
- Red or swollen eyelids
- Dry-eye symptoms
The discomfort usually feels superficial rather than deeply painful.
Persistent focal tenderness may indicate a stye, infected gland or another eyelid condition. Blepharitis commonly produces burning, foreign-body sensation, watering and sensitivity to light.
Eye Allergy
Allergic conjunctivitis more commonly causes:
- Prominent itching
- Watering
- Puffy eyelids
- Stringy mucus
- Redness
- Symptoms in both eyes
Itching is usually more characteristic than severe pain.
Marked pain, photophobia or reduced vision is unusual for uncomplicated allergy and should prompt assessment for another diagnosis.
Conjunctivitis
Conjunctivitis may cause:
- Redness
- Burning
- Grittiness
- Watering
- Discharge
- Crusting of the eyelashes
Ordinary viral or bacterial conjunctivitis usually causes irritation rather than intense pain.
Symptoms suggesting a more serious condition include:
- Marked pain
- Significant photophobia
- Reduced vision
- Contact-lens use
- Corneal opacity
- Severe one-sided redness
- Failure to improve
Pink eye may cause burning, discharge and foreign-body sensation, but pronounced pain or visual reduction requires evaluation for deeper or corneal disease.
Stye
A stye is an inflamed or infected eyelid gland.
It usually produces:
- A tender eyelid lump
- Local redness
- Swelling
- Pain when touched
- Watering
Seek medical care when the swelling spreads, the entire eyelid becomes red, vision is affected or the eye itself becomes painful or light-sensitive.
Corneal Abrasion
A corneal abrasion is a scratch on the clear surface of the eye.
Possible causes include:
- Fingernails
- Paper
- Plant material
- Makeup brushes
- Dust or grit
- Contact-lens trauma
- Accidental rubbing
Symptoms may include:
- Sudden sharp pain
- Foreign-body sensation
- Watering
- Redness
- Light sensitivity
- Blurred vision
- Difficulty opening the eye
A deeper injury may cause scarring and permanent visual reduction. Corneal injury commonly causes pain, blur, redness, watering and photophobia.
Retained Foreign Body
A particle may become trapped:
- On the cornea
- Under the upper eyelid
- Within the conjunctiva
- Inside the eye after high-speed impact
Symptoms may include:
- Scratching with each blink
- Persistent foreign-body sensation
- Watering
- Redness
- Localised pain
- Blurred vision
High-velocity injuries involving drilling, grinding, hammering metal or power tools can penetrate the eye while leaving only a small external wound.
Do not attempt to remove:
- Embedded metal
- Glass
- A deeply lodged object
- Any object protruding from the eye
Protect the eye from pressure and obtain emergency care.
Recurrent Corneal Erosion
Recurrent corneal erosion occurs when the outer corneal layer does not adhere securely.
It may follow:
- A previous abrasion
- Fingernail trauma
- Plant injury
- Epithelial basement membrane dystrophy
- Other corneal dystrophies
The classic pattern is:
- Sudden severe pain during sleep or on waking
- Watering
- Redness
- Blurred vision
- Light sensitivity
- A feeling that the eyelid has torn the surface
Episodes may occur months or years after the original injury. Corneal erosion pain is often worse first thing in the morning and improves later in the day.
Corneal Infection or Keratitis
Keratitis is inflammation or infection of the cornea.
Symptoms may include:
- Increasing pain
- Redness
- Blurred vision
- Light sensitivity
- Watering
- Discharge
- A white or grey corneal spot
- Difficulty keeping the eye open
Possible causes include:
- Bacteria
- Fungi
- Herpes viruses
- Acanthamoeba
- Trauma
- Contact-lens wear
- Contaminated water exposure
Corneal infection can progress quickly and cause:
- Corneal ulceration
- Scarring
- Perforation
- Permanent visual loss
Contact-lens-related infection is a major cause of microbial keratitis.
Eye Pain in a Contact-Lens Wearer
Contact-lens wearers should remove their lenses immediately when they develop:
- Eye pain
- Redness
- Light sensitivity
- Sudden blurred vision
- Excessive watering
- Discharge
These symptoms may indicate microbial keratitis rather than simple dryness.
Do not:
- Reinsert the lens
- Continue wearing the other lens solely for convenience
- Use tap water to rinse the lens
- Self-start leftover steroid drops
- Wait several days to see whether severe symptoms settle
Contact-lens users with pain, redness, photophobia or sudden blur should contact an eye-care professional promptly.
Acanthamoeba Keratitis
Acanthamoeba is a microscopic organism that can cause a difficult-to-treat corneal infection.
Risk is associated particularly with:
- Contact-lens exposure to tap water
- Swimming or showering in lenses
- Poor lens hygiene
- Homemade saline
- Contaminated lens cases
Symptoms may include:
- Severe or persistent pain
- Redness
- Light sensitivity
- Blurred vision
- Excessive tearing
- Foreign-body sensation
Pain may sometimes appear greater than the early visible signs, although not every affected patient has severe pain. Early diagnosis is important because delayed treatment can lead to extensive corneal damage.
Herpes Eye Disease
Herpes simplex or shingles may affect:
- Eyelid skin
- Conjunctiva
- Cornea
- Iris
- Retina
- Optic nerve
Possible symptoms include:
- Pain
- Redness
- Light sensitivity
- Watering
- Blurred vision
- Eyelid blisters
- A forehead or scalp rash
Shingles affecting the forehead, upper eyelid or tip of the nose may involve the eye.
Steroid drops can worsen certain untreated herpetic infections and should not be used without ophthalmic supervision. Herpes-related keratitis and iritis can produce pain, redness and reduced vision.
Uveitis
Uveitis is inflammation inside the eye.
Anterior uveitis, or iritis, commonly causes:
- A deep aching pain
- Redness around the cornea
- Light sensitivity
- Blurred vision
- Watering
- A small or irregular pupil
- Floaters in selected cases
Light shining into either eye may worsen discomfort because both pupils react together.
Uveitis may be associated with:
- Autoimmune disease
- Infection
- Previous eye surgery
- Trauma
- No identifiable cause
It requires prompt assessment because untreated inflammation can cause glaucoma, cataract, macular swelling and permanent visual loss.
Episcleritis
Episcleritis is inflammation of a superficial tissue layer over the white of the eye.
It commonly causes:
- A localised red patch
- Mild tenderness
- Irritation
- Watering
Vision is usually unaffected, and the discomfort is ordinarily much milder than in scleritis.
Recurrent episodes may occasionally be associated with systemic inflammatory disease.
Scleritis
Scleritis is deeper inflammation of the sclera, the tough white wall of the eye.
Pain is often described as:
- Deep
- Severe
- Boring
- Throbbing
- Radiating towards the forehead, temple or jaw
- Worse with eye movement
- Worse at night
- Severe enough to wake the patient from sleep
The eye may appear:
- Deep red
- Bluish-red
- Purple
- Tender
Scleritis can threaten sight and may be associated with conditions such as rheumatoid arthritis or systemic vasculitis. Severe deep pain—particularly when it disturbs sleep—is not typical of simple conjunctivitis.
Acute Angle-Closure Glaucoma
Acute angle closure occurs when the drainage angle becomes blocked suddenly and eye pressure rises rapidly.
Symptoms may include:
- Intense eye pain
- A red eye
- Tenderness around the eye
- Blurred or misty vision
- Rainbow-coloured halos
- Headache
- Nausea
- Vomiting
- A cloudy cornea
- A poorly reactive pupil
This is an emergency because sustained high pressure can permanently damage the optic nerve.
Singapore HealthHub advises urgent review for painful red eyes with blurred vision.
Does Ordinary Chronic Glaucoma Cause Pain?
Usually not.
Primary open-angle glaucoma and normal-tension glaucoma generally progress:
- Slowly
- Painlessly
- Without visible redness
- Without a sensation of pressure
Eye discomfort in a patient with chronic glaucoma may instead come from:
- Dry eye
- Preserved glaucoma medication
- Medication allergy
- Cataract
- Corneal disease
- Acute angle closure
- A complication of previous surgery
The patient should not assume that pain is simply part of chronic glaucoma.
Optic Neuritis
Optic neuritis is inflammation of the optic nerve.
It commonly causes:
- Pain behind or around the eye
- Pain worsened by eye movement
- Reduced vision in one eye
- Washed-out colours
- Reduced contrast
- A central blind spot
The external eye may look normal.
Symptoms often worsen over several days rather than occurring as a brief surface irritation.
Optic neuritis may occur alone or be associated with inflammatory or demyelinating neurological disease.
Orbital Cellulitis
Orbital cellulitis is a serious infection of the tissues behind and around the eyeball.
It may follow:
- Sinus infection
- Eyelid infection
- Trauma
- Surgery
- Dental infection
- Spread from nearby tissues
Warning signs include:
- Fever
- Significant eyelid swelling
- Pain with eye movement
- Restricted eye movement
- Double vision
- Reduced vision
- A bulging eye
- Severe headache
- General illness
Orbital cellulitis requires emergency imaging, intravenous antibiotics and specialist assessment because it may threaten vision and spread towards the brain.
Thyroid Eye Disease
Thyroid eye disease may cause:
- Pressure or aching behind the eyes
- Grittiness
- Redness
- Light sensitivity
- Puffy eyelids
- Bulging eyes
- Pain or restriction when looking around
- Double vision
- Incomplete eyelid closure
Rarely, swollen orbital tissues compress the optic nerve and cause visual loss.
New colour-vision loss, reduced vision or inability to close the eyes requires urgent assessment.
Eye Injury
Eye trauma may cause pain through:
- Corneal abrasion
- Foreign body
- Bleeding inside the eye
- Iris inflammation
- Lens injury
- Orbital fracture
- Open-globe injury
- Raised or reduced eye pressure
Emergency assessment is required for:
- High-velocity impact
- Sharp-object injury
- Visible deformation of the eye
- Blood inside the eye
- Reduced vision
- Severe pain
- An irregular pupil
- Double vision
- Nausea after injury
- Fluid leaking from the eye
Do not press or patch tightly over an eye when penetration is suspected.
Chemical Eye Injury
Chemical exposure is an immediate emergency.
Examples include:
- Bleach
- Oven cleaner
- Drain cleaner
- Cement
- Laboratory chemicals
- Industrial solvents
- Cleaning products
- Agricultural chemicals
What to Do Immediately
- Begin rinsing the eye at once.
- Use clean tap water or saline.
- Hold the eyelids open.
- Remove contact lenses if they come out easily.
- Continue copious irrigation while arranging emergency care.
- Bring the chemical container or safety information when available.
Do not delay irrigation while searching for a special solution.
Strong chemical exposure requires continued flushing during transport for emergency treatment.
Eye Pain After Surgery
Some mild discomfort is expected after certain procedures.
Urgent warning signs include:
- Increasing rather than improving pain
- Worsening redness
- Sudden blurred or reduced vision
- Discharge
- Marked light sensitivity
- Nausea or vomiting
- New floaters or a curtain
- A painful filtering bleb
- A visible exposed glaucoma tube
After cataract surgery, loss of vision, excessive pain or increasing redness requires prompt review.
Eye Pain After an Intravitreal Injection
Mild surface irritation from antiseptic may occur for a day or two.
Worsening pain or vision may indicate:
- Infection inside the eye
- Significant inflammation
- Corneal injury
- Pressure elevation
- Another complication
Patients should contact their eye doctor immediately when pain or visual problems worsen after an eye injection.
Giant Cell Arteritis
Giant cell arteritis is inflammation of medium and large arteries and occurs almost exclusively in people over 50.
Warning symptoms include:
- New headache
- Temple tenderness
- Scalp pain
- Jaw or tongue pain while chewing
- Fever
- Fatigue
- Unexplained weight loss
- Shoulder or hip stiffness
- Double vision
- Temporary visual obscurations
- Sudden visual loss
The eye itself is often not painful when visual loss occurs.
Urgent treatment may be started before all test results are available because visual loss can become permanent and the second eye may be affected rapidly.
Headache Disorders and Pain Around the Eye
Migraine
Migraine may cause pain:
- Around one eye
- Behind the eye
- At the temple
- On one side of the head
It may be associated with:
- Nausea
- Light sensitivity
- Sound sensitivity
- Visual aura
- Throbbing pain
A typical migraine history does not exclude an eye emergency when the eye is red, vision is reduced or the current episode is different from previous attacks.
Cluster Headache
Cluster headache classically causes severe one-sided pain around or behind one eye.
It may be associated with:
- Watering
- Nasal blockage
- Eyelid drooping
- A small pupil
- Facial sweating
- Restlessness
Because acute angle closure can also cause intense one-sided eye and head pain, a first severe attack—particularly with redness or visual symptoms—requires assessment.
Sinus-Related Pain
Sinus disease may cause pressure around:
- The brow
- Cheeks
- Nose
- Eyes
Pain may worsen when bending forward and may accompany nasal symptoms.
Sinus pain does not usually cause:
- A markedly red eye
- Corneal clouding
- Severe photophobia
- True visual loss
- An abnormal pupil
Eye symptoms with fever, swelling, pain on eye movement or reduced vision raise concern for orbital spread rather than uncomplicated sinus pressure.
Nerve-Related Pain
Facial nerve disorders may cause pain perceived around the eye.
Examples include:
- Trigeminal neuralgia
- Post-herpetic neuralgia
- Neuropathic corneal pain
- Other cranial neuralgias
Pain may be:
- Electric-shock-like
- Burning
- Triggered by touch
- Triggered by wind
- Present despite limited visible eye findings
Other ocular causes must be excluded before attributing severe pain entirely to nerve dysfunction.
Can Eye Strain Cause Eye Pain?
Visual strain may cause:
- Tired eyes
- Frontal headache
- Aching around the eyes
- Difficulty focusing
- Symptoms after prolonged near work
Contributors include:
- An outdated spectacle prescription
- Presbyopia
- Uncorrected hyperopia or astigmatism
- Binocular-vision problems
- Dry eye
- Poor ergonomics
- Inadequate sleep
Eye strain should not cause severe redness, marked photophobia or visual loss.
Why Does Light Hurt the Eye?
Pain from light is called photophobia.
It may occur when:
- The cornea is injured or inflamed
- The iris or ciliary body is inflamed
- The ocular surface is severely irritated
- Migraine pathways are activated
- Meningeal or neurological irritation is present
Important eye causes include:
- Corneal abrasion
- Keratitis
- Uveitis
- Severe dry eye
- Postoperative inflammation
Photophobia together with pain or reduced vision is a red flag.
Why Does It Hurt When I Blink?
Pain on blinking may suggest:
- Corneal abrasion
- Foreign body beneath the eyelid
- Loose corneal epithelium
- Dry eye
- An eyelash rubbing the cornea
- Contact-lens damage
- Inflamed eyelid glands
A foreign body under the upper eyelid may repeatedly scratch the cornea with each blink.
Persistent symptoms require lid eversion and slit-lamp examination.
Why Does My Eye Hurt When I Wake Up?
Possible causes include:
- Recurrent corneal erosion
- Severe overnight dryness
- Sleeping with the eyelids partly open
- Corneal swelling
- Eyelid inflammation
- Contact-lens overwear
Sudden sharp pain during sleep or immediately upon opening the eye is particularly suggestive of recurrent corneal erosion.
Why Does My Eye Hurt When I Look Around?
Pain with eye movement may arise from:
- Optic neuritis
- Scleritis
- Orbital cellulitis
- Thyroid eye disease
- Orbital inflammation
- Eye-muscle injury
- Orbital fracture
Pain with movement plus visual or colour-vision reduction suggests optic-nerve or orbital involvement rather than simple surface irritation.
Painful restricted movement, eyelid swelling, fever or a bulging eye requires emergency assessment.
Can High Eye Pressure Be Felt?
Moderately elevated chronic pressure usually causes no sensation.
Patients cannot reliably estimate their eye pressure from:
- Heaviness
- Eyelid twitching
- Ordinary headache
- Screen-related fatigue
- Pressure around the eyes
Very high or rapidly rising pressure may cause:
- Severe pain
- Redness
- Corneal swelling
- Blurred vision
- Halos
- Headache
- Nausea or vomiting
A pressure measurement is needed to determine whether eye pressure is involved.
How Is Eye Pain Assessed?
Medical History
The clinician asks about:
- Sudden or gradual onset
- Surface or deep pain
- One or both eyes
- Redness
- Vision change
- Light sensitivity
- Contact-lens use
- Trauma or chemical exposure
- Surgery or injection
- Headache
- Fever
- Autoimmune disease
- Medication
- Rash or shingles
- Neurological symptoms
Visual-Acuity Testing
Each eye is tested separately.
Reduced vision significantly increases concern for:
- Corneal disease
- Uveitis
- Acute glaucoma
- Optic-nerve disease
- Orbital disease
- Postoperative complications
Pupil Examination
The pupils are checked for:
- Size
- Shape
- Light response
- Asymmetry
- A relative afferent pupillary defect
An abnormal pupil may indicate acute angle closure, optic-nerve disease, severe retinal disease, trauma or neurological dysfunction.
Eye-Movement Assessment
The clinician checks whether eye movements are:
- Full
- Restricted
- Painful
- Associated with double vision
Painful restriction may indicate orbital infection, inflammation, trauma or thyroid eye disease.
Slit-Lamp Examination
The slit lamp allows detailed inspection of:
- Eyelids
- Tear film
- Conjunctiva
- Cornea
- Anterior chamber
- Iris
- Lens
Fluorescein dye may reveal:
- Corneal abrasion
- Ulceration
- Contact-lens injury
- Loose epithelium
- Herpes-related patterns
- Wound leakage
Eye-Pressure Measurement
Tonometry helps detect:
- Acute angle closure
- Glaucoma-related pressure elevation
- Steroid response
- Uveitic pressure changes
- Postoperative pressure abnormalities
Eyelid Eversion
Turning the upper eyelid allows the clinician to look for:
- Sand
- Metal
- Eyelashes
- Plant material
- Contact-lens fragments
- Papillary inflammation
Dilated Eye Examination
Dilation may be required to examine:
- Vitreous
- Retina
- Macula
- Optic nerve
- Signs of inflammation
- Trauma-related damage
Additional Tests
Depending on the suspected cause, investigation may include:
- Corneal cultures or scrapings
- OCT
- Corneal imaging
- Visual-field testing
- Colour-vision testing
- Blood tests
- Inflammatory markers
- CT or MRI
- Sinus or orbital imaging
- Autoimmune evaluation
What Can Be Done Safely at Home?
For mild irritation without red flags:
- Remove contact lenses.
- Avoid rubbing the eye.
- Use preservative-free artificial tears.
- Rest from prolonged screen use.
- Avoid direct fan or air-conditioning flow.
- Apply a cool compress for mild allergy or irritation.
- Use a comfortably warm compress for a tender stye when appropriate.
- Take ordinary oral pain relief when medically safe.
Home care is not appropriate for severe, persistent or vision-threatening symptoms.
What Should Not Be Done?
Do not:
- Use another person’s eye drops
- Restart old steroid drops
- Apply topical anaesthetic drops at home
- Patch a painful contact-lens eye
- Remove embedded objects
- Rub a chemically injured eye
- Delay irrigation after chemical exposure
- Continue contact-lens wear through pain
- Assume severe pain is merely conjunctivitis
- Drive when vision is impaired
Repeated topical anaesthetic use can delay corneal healing and cause serious surface injury; these drops are normally reserved for examination rather than unsupervised home treatment.
Are Redness-Relief Drops Suitable?
Drops that constrict surface blood vessels may make the eye temporarily appear whiter.
They do not treat:
- Keratitis
- Uveitis
- Scleritis
- Acute angle closure
- A foreign body
- Orbital disease
They may mask worsening redness and delay assessment.
Persistent or painful redness should be diagnosed rather than cosmetically suppressed.
Frequently Asked Questions
Is eye pain always serious?
No.
Dry eye, blepharitis and mild surface irritation are common.
Severe, persistent or vision-associated pain may be serious.
Can dry eye cause severe pain?
Yes.
Severe surface disease or abnormal corneal nerve sensitivity can cause substantial burning or aching.
Other causes must first be excluded.
Does conjunctivitis cause severe pain?
Simple conjunctivitis usually causes irritation, burning or grittiness rather than intense pain.
Severe pain or photophobia suggests another diagnosis.
Can a corneal scratch heal by itself?
Small abrasions often heal quickly, but deeper injuries, infection, retained foreign bodies and contact-lens-related abrasions require closer assessment.
Can I sleep with an eye patch for a scratch?
Do not patch the eye unless instructed.
Patching may be unsuitable in contact-lens wearers or when infection is possible.
Can I use antibiotic drops left over from a previous infection?
No.
The bottle may be expired or contaminated, and the current condition may require a different treatment.
Can I use steroid drops for redness and pain?
Not without medical supervision.
Steroids may worsen herpes, fungal or other corneal infections and may raise eye pressure.
Does eye pain mean my glaucoma is worsening?
Chronic open-angle glaucoma is usually painless.
Pain in a glaucoma patient may indicate another condition or acute pressure elevation.
Can cataract cause pain?
Ordinary age-related cataract is painless.
Pain in an eye with cataract suggests another condition.
Can retinal detachment cause pain?
Retinal detachment is usually painless.
Its warning symptoms are flashes, floaters, a curtain or visual-field loss.
Can optic neuritis occur when the eye looks normal?
Yes.
The inflammation may be behind the visible optic disc.
Can migraine cause pain behind one eye?
Yes.
A familiar migraine pattern may produce one-sided pain, nausea and light sensitivity.
A first severe episode with a red eye or visual loss still requires assessment.
Can sinusitis cause eye pain?
It can cause pressure around the eye.
Painful eye movement, eyelid swelling, double vision or reduced vision raises concern for orbital involvement.
Can stress cause eye pain?
Stress may worsen:
- Migraine
- Muscle tension
- Dry eye
- Visual strain
- Awareness of discomfort
It should not be used to explain severe or progressive symptoms before important causes are excluded.
Why does the other eye hurt when light is shone into the healthy eye?
Light causes both pupils to constrict.
When the iris or ciliary body is inflamed, this consensual pupil response may trigger pain in the affected eye.
Why is the eye painful but not red?
Possible causes include:
- Optic neuritis
- Posterior scleritis
- Migraine
- Neuralgia
- Early corneal disease
- Referred pain
A white external appearance does not exclude deeper disease.
Why is the eye red but not painful?
Possible causes include:
- Subconjunctival haemorrhage
- Mild conjunctivitis
- Allergy
- Episcleritis
- Dry eye
Visual symptoms or increasing discomfort still require review.
Can children accurately describe eye pain?
Not always.
Possible signs include:
- Repeated eye rubbing
- Refusal to open one eye
- Avoidance of light
- Persistent crying
- Eyelid swelling
- Reduced visual attention
- A new squint
- Holding the head abnormally
A child with fever, swollen eyelids, painful eye movement or a bulging eye requires urgent assessment.
Is pain after cataract surgery normal?
Mild irritation may occur early.
Increasing pain, redness or visual reduction is not normal and requires prompt review.
Is pain after an eye injection normal?
Mild surface irritation may occur briefly.
Worsening pain or reduced vision requires immediate contact with the treating clinic.
Should I drive with eye pain?
Do not drive when:
- Vision is blurred
- Light sensitivity is significant
- Both eyes cannot remain comfortably open
- Pain is distracting
- Dilating drops have affected vision
A Practical Urgency Guide
Emergency Assessment Now
- Chemical injury
- Penetrating or high-velocity trauma
- Sudden severe pain with visual loss
- Painful red eye with nausea or halos
- Contact-lens-related pain with redness or blur
- Severe postoperative or post-injection pain
- Eyelid swelling with fever, proptosis or painful restricted movement
- Eye pain with stroke symptoms
- Visual symptoms suggesting giant cell arteritis
Same-Day or Prompt Eye Assessment
- Moderate or severe pain
- Significant photophobia
- Persistent one-sided pain
- Corneal foreign-body sensation
- Suspected abrasion
- New pain with redness
- Reduced or altered colour vision
- Pain on eye movement
- Symptoms that do not improve after lens removal
- Pain that repeatedly wakes the patient from sleep
Routine Assessment May Be Appropriate
- Mild intermittent burning
- Symptoms affecting both eyes
- Temporary improvement after blinking
- Stable dry-eye or eyelid symptoms
- No redness, photophobia or visual change
Any deterioration moves the symptom into a more urgent category.
A Practical Clinical Approach
Step 1: Identify the Pain Pattern
- Burning
- Foreign-body sensation
- Sharp surface pain
- Deep ache
- Throbbing
- Pain with movement
- Headache around the eye
Step 2: Test Each Eye Separately
Determine whether vision is:
- Normal
- Blurred
- Dim
- Missing in part of the field
- Associated with reduced colour intensity
Step 3: Look for Red Flags
- Redness
- Photophobia
- Vision loss
- Abnormal pupil
- Corneal opacity
- Contact-lens wear
- Fever
- Trauma
- Surgery
- Neurological symptoms
Step 4: Examine the Ocular Surface
Assess:
- Tear film
- Eyelids
- Cornea
- Foreign bodies
- Abrasions
- Infection
Step 5: Assess Deeper Structures
Check:
- Anterior chamber
- Iris
- Eye pressure
- Optic nerve
- Retina
- Orbit
Step 6: Treat the Cause
Treatment may include:
- Lubrication
- Eyelid treatment
- Foreign-body removal
- Antibiotic, antiviral or antifungal medication
- Anti-inflammatory treatment
- Pressure-lowering medication
- Laser
- Surgery
- Systemic antibiotics
- Neurological or rheumatological treatment
Common Myths About Eye Pain
“A very painful eye must have a large injury.”
False.
A tiny corneal scratch may be extremely painful.
“No pain means the eye is safe.”
False.
Retinal detachment and vascular visual loss are often painless.
“Conjunctivitis is the usual cause of every painful red eye.”
False.
Keratitis, uveitis, scleritis and acute angle closure are more serious alternatives.
“Eye pressure can be felt.”
Usually false.
Chronic pressure elevation commonly causes no sensation.
“Contact-lens discomfort can be watched for several days.”
False.
Pain, redness, photophobia or blur may represent microbial keratitis.
“Steroid drops are safe because they reduce inflammation.”
False.
They can worsen certain infections and raise eye pressure.
“A white-looking eye cannot have serious disease.”
False.
Optic neuritis and posterior orbital or scleral disease may occur without obvious redness.
“A previously normal examination means new pain is harmless.”
False.
A new symptom requires assessment according to its current features.
The Bottom Line
Eye pain may arise from:
- The eyelids
- Tear film
- Cornea
- Conjunctiva
- Iris
- Sclera
- Eye pressure
- Optic nerve
- Orbit
- Headache or neurological pathways
The character of the pain provides useful clues:
- Burning or grittiness: often surface-related
- Sharp pain with blinking: abrasion or foreign body
- Severe pain on waking: recurrent corneal erosion
- Deep aching with photophobia: uveitis or other intraocular inflammation
- Severe throbbing pain disturbing sleep: consider scleritis
- Pain with halos and nausea: consider acute angle closure
- Pain with eye movement and colour loss: consider optic neuritis
- Painful movement with swelling and fever: consider orbital cellulitis
Seek urgent care when pain is associated with:
- Reduced vision
- Significant redness
- Photophobia
- Contact-lens wear
- Chemical exposure
- Trauma
- Surgery or injection
- Fever or eyelid swelling
- Neurological symptoms
- Giant cell arteritis symptoms
The severity of eye pain does not reliably reveal the seriousness of the condition. The safest approach is to treat severe, persistent or vision-associated pain as urgent until the cornea, eye pressure, internal eye structures, optic nerve and orbit have been properly examined.
References
- National Institute for Health and Care Excellence. Red Eye: Red-Flag Symptoms and Assessment.
- NHS. Eye Pain.
- National Eye Institute. Corneal Conditions. Updated August 2025.
- Centers for Disease Control and Prevention. Contact-Lens-Related Microbial Keratitis. Updated May 2025.
- National Eye Institute. Contact Lenses: When to Seek Help.
- National Eye Institute. Uveitis. Updated December 2024.
- Singapore HealthHub. Glaucoma.
- NHS. Glaucoma.
- National Eye Institute. Corneal Dystrophies and Corneal Erosion.
- Moorfields Eye Hospital. Recurrent Corneal Erosion Syndrome.
- Imperial College Healthcare NHS Trust. Scleritis.
- University Hospitals Birmingham NHS Foundation Trust. Scleritis. 2026.
- Hull University Teaching Hospitals. Optic Neuritis.
- NHS. Temporal Arteritis.
- NHS Tayside. Giant Cell Arteritis.
- NHS Lanarkshire. Orbital Cellulitis Guideline.
- National Eye Institute. Graves’ Eye Disease.
- NHS. Eye Injuries.
- CDC and NIOSH. First Aid Procedures for Chemical Eye Exposure.
- National Eye Institute. Injections to Treat Eye Conditions. Updated March 2026.
