Author: Dr Val Phua
Estimated reading time: 12–14 minutes
Is Glaucoma Passed Down Through Families?
Glaucoma can run in families, but the answer is not as simple as saying that it is inherited in every case.
For most adults with primary open-angle glaucoma, the disease develops through a combination of:
- Multiple genetic variations
- Increasing age
- Eye-pressure susceptibility
- Optic-nerve anatomy
- Corneal and drainage-system characteristics
- Environmental and general health factors
Having a parent, sibling or child with glaucoma increases your risk, but it does not mean that you will definitely develop the disease.
Similarly, a person can develop glaucoma even when no other family member is known to have it.
Family history is recognised as an established risk factor for primary open-angle glaucoma and primary angle-closure disease.
What Does “Hereditary” Mean?
A hereditary condition is one in which genetic information that influences disease risk is passed from parents to their children.
However, inherited conditions can behave in different ways.
Single-Gene Inheritance
A disease may be caused predominantly by a harmful variant in one gene.
These conditions may follow a recognisable inheritance pattern, such as:
- Autosomal dominant
- Autosomal recessive
- X-linked inheritance
Certain congenital and juvenile glaucomas can behave this way.
Complex or Polygenic Inheritance
A disease may be influenced by many genetic variations, each contributing a small amount of risk.
The final outcome also depends on age, anatomy and other non-genetic factors.
Most common adult primary open-angle glaucoma falls into this complex category. It is genetically influenced, but there is usually no single “glaucoma gene” that determines whether a person will develop the disease.
How Much Does Family History Increase the Risk?
The exact risk varies according to:
- The type of glaucoma in the family
- Which relative is affected
- How many relatives are affected
- The age at which glaucoma developed
- Ethnicity
- Eye anatomy
- Whether the family diagnosis was accurate
- Whether relatives have undergone proper screening
The Baltimore Eye Survey found that people reporting an affected sibling had substantially higher odds of primary open-angle glaucoma than those without such a history. The association was stronger for siblings than for affected parents or children in that study.
The Rotterdam Study found glaucoma in approximately 10.4% of siblings of affected patients, compared with 0.7% of siblings of controls. These figures should not be treated as a precise prediction for every family because age, ethnicity and screening methods differ between studies.
A 2026 review of 42 family-screening studies found a median glaucoma prevalence of approximately 11% among screened relatives. The median prevalence was higher among siblings and parents than among offspring, although the parents were usually older and therefore already at greater age-related risk.
The practical message is clear:
A first-degree relative of someone with glaucoma should not assume that clear vision or the absence of symptoms means the eyes are healthy.
Who Is Considered a First-Degree Relative?
First-degree biological relatives include:
- Parents
- Brothers and sisters
- Children
They share more genetic material than more distant relatives and generally deserve the greatest attention when glaucoma runs in the family.
Grandparents, aunts, uncles, nieces, nephews and cousins may also provide useful family-history information, particularly when several relatives across multiple generations are affected.
A husband, wife or non-biological family member does not share the inherited genetic risk, although they may share environmental and lifestyle factors.
Is Risk Higher If More Than One Relative Has Glaucoma?
Usually, yes.
Concern is greater when:
- Several first-degree relatives are affected
- Glaucoma occurs in successive generations
- Both sides of the family are affected
- Several relatives developed glaucoma young
- Family members required surgery
- Relatives lost vision despite treatment
- The disease appears unusually severe or aggressive
This pattern may indicate a stronger inherited contribution.
However, the absence of a known family history does not exclude glaucoma. Older relatives may never have been examined, may have been diagnosed incorrectly or may have died before the disease became apparent.
Does It Matter Which Relative Has Glaucoma?
All first-degree relatives are important, but siblings may sometimes share a particularly similar combination of:
- Genes
- Ethnicity
- Early-life environment
- Educational background
- General anatomical traits
Several family-screening studies have found a high prevalence of glaucoma or suspicious findings among siblings of affected patients.
A parent with glaucoma still meaningfully increases the child’s lifetime risk.
A child diagnosed with early-onset glaucoma may also reveal that a parent carries an inherited variant but has milder or later-onset disease.
Can Glaucoma Be Inherited from Either Parent?
Yes.
Glaucoma-related genetic susceptibility can be inherited from either the mother or the father.
There is no general rule that glaucoma is inherited only through one side of the family.
When taking a family history, patients should consider:
- Maternal relatives
- Paternal relatives
- Half-siblings
- Relatives diagnosed overseas
- Relatives described as having “high eye pressure”
- Relatives who became blind without a clear diagnosis
Can Glaucoma Skip a Generation?
It can appear to.
Possible explanations include:
- A person inherited susceptibility but never developed clinically detectable disease.
- Disease developed late and was never diagnosed.
- The person died before glaucoma became apparent.
- A single-gene condition had reduced penetrance.
- The glaucoma was mild or misdiagnosed.
- Different family members inherited different combinations of risk variants.
Penetrance describes how often a person carrying a disease-associated genetic variant actually develops the condition.
Incomplete penetrance means that not every carrier becomes affected.
Variable expression means that affected relatives may develop glaucoma at different ages or with very different levels of severity.
If My Parent Has Glaucoma, Will I Definitely Develop It?
No.
Family history increases probability rather than determining certainty.
Whether glaucoma develops depends on other factors, including:
- Age
- Eye pressure
- Corneal thickness
- Drainage-angle anatomy
- Degree of myopia or hyperopia
- Optic-nerve structure
- Steroid exposure
- Previous eye trauma
- General vascular and health factors
- The specific type of glaucoma
Someone without a family history may still develop glaucoma, while someone with several affected relatives may remain healthy with lifelong monitoring.
Is Primary Open-Angle Glaucoma Hereditary?
Primary open-angle glaucoma has a substantial genetic component, but most cases are complex and multifactorial.
Many genetic variations have been associated with:
- Eye pressure
- Optic-disc size
- Retinal nerve-fibre thickness
- Retinal ganglion-cell susceptibility
- Age of glaucoma onset
- Risk of progression
Each common variation usually contributes only a small amount of risk.
The inherited susceptibility then interacts with other clinical factors, including pressure, ageing and optic-nerve anatomy.
This is why routine genetic testing does not currently replace:
- Eye-pressure measurement
- Optic-nerve examination
- OCT
- Visual-field testing
- Gonioscopy
Which Genes Can Cause Open-Angle Glaucoma?
Rare disease-causing variants in genes including MYOC, OPTN and TBK1 can produce more clearly inherited forms of open-angle glaucoma.
MYOC
Disease-causing variants in the MYOC gene are the best-established cause of inherited juvenile open-angle glaucoma.
MYOC-related disease often:
- Develops before age 40
- Produces high eye pressure
- Runs through several generations
- Follows an autosomal-dominant pattern
- May be aggressive
- May require surgery
Approximately 10% to 33% of people with juvenile open-angle glaucoma have been reported to carry a disease-causing MYOC variant, although prevalence differs between populations.
OPTN and TBK1
Rare variants involving OPTN and duplications of TBK1 have been associated particularly with some familial forms of normal-tension glaucoma.
These variants are uncommon and do not explain most cases of normal-tension glaucoma.
What Does Autosomal Dominant Mean?
In an autosomal-dominant condition, one disease-causing copy of a gene may be sufficient to increase disease risk.
A person carrying such a variant has a 50% chance of passing that specific variant to each biological child.
This does not necessarily mean that every child inheriting the variant will develop equally severe glaucoma.
The condition may show:
- Incomplete penetrance
- Different ages of onset
- Different pressure levels
- Different rates of progression
- Different treatment requirements
A 50% chance applies only when a confirmed autosomal-dominant disease-causing variant is present. It should not be applied automatically to every family with ordinary adult glaucoma.
Is Juvenile Open-Angle Glaucoma More Strongly Hereditary?
It can be.
Juvenile open-angle glaucoma generally develops before age 40 and may begin during childhood, adolescence or early adulthood.
It is often associated with:
- Very high eye pressure
- Open drainage angles
- Rapid optic-nerve damage
- Strong family history
- MYOC-related disease
Because vision loss can occur while patients are still young, first-degree relatives may need screening earlier than would normally be recommended for age-related glaucoma.
Is Normal-Tension Glaucoma Hereditary?
Normal-tension glaucoma can cluster in families.
In most families, the inherited tendency is likely to be complex rather than caused by one identifiable gene.
Rare families may carry disease-causing variants involving genes such as OPTN or TBK1.
Family members should understand that normal eye-pressure readings do not exclude inherited risk. Optic-nerve imaging and visual-field assessment may still be needed.
Is Angle-Closure Glaucoma Hereditary?
Family history also influences the risk of primary angle-closure disease.
Inherited anatomical features may include:
- Shorter eyeballs
- Shallower anterior chambers
- Narrower drainage angles
- Thicker or more anteriorly positioned lenses
- Smaller corneal diameters
- Particular iris configurations
The 2025 American Academy of Ophthalmology guideline lists family history as a recognised risk factor for primary angle-closure disease. Asian ancestry is also an important population-level risk factor.
A Singapore study involving siblings of Chinese patients with primary angle closure or angle-closure glaucoma found that siblings had almost a 50% probability of having narrow angles and were more than seven times as likely to have narrow angles as the general population comparison group.
This is especially relevant in Singapore, where many patients have East, South or Southeast Asian ancestry.
If My Relative Had an Acute Glaucoma Attack, Should I Be Checked?
Yes.
An acute angle-closure attack may indicate an inherited tendency towards anatomically narrow angles.
First-degree relatives should consider assessment that includes:
- Anterior-chamber depth
- Gonioscopy
- Eye-pressure measurement
- Optic-nerve examination
- Lens and angle anatomy
- Anterior-segment imaging when appropriate
An ordinary spectacle test or air-puff pressure check may miss narrow angles.
Is Primary Congenital Glaucoma Hereditary?
Primary congenital glaucoma develops because the drainage system of the eye does not form normally.
It may present during infancy or early childhood with:
- Excessive tearing
- Light sensitivity
- Eyelid squeezing
- Cloudy corneas
- Enlarged eyes
- Elevated pressure
Some cases are sporadic. Others are inherited.
Genes associated with childhood primary glaucoma include:
- CYP1B1
- LTBP2
- TEK
- ANGPT1
- FOXC1
- MYOC
The inheritance pattern depends on the gene. CYP1B1- and LTBP2-related disease commonly follows an autosomal-recessive pattern, while TEK- and ANGPT1-related disease can follow an autosomal-dominant pattern with variable expression.
What Does Autosomal Recessive Mean?
In an autosomal-recessive condition, a child usually needs to inherit two disease-causing copies of a gene—one from each parent—to develop the condition.
Parents carrying one altered copy are often unaffected.
When both parents carry a disease-causing variant in the same recessive gene, each pregnancy generally has:
- A 25% chance of an affected child
- A 50% chance of a carrier child
- A 25% chance of a child who inherited neither variant
These probabilities apply only when the specific genetic diagnosis is established.
Autosomal-recessive conditions may be more common in families where the biological parents are closely related.
Can Glaucoma Be Part of a Genetic Syndrome?
Yes.
Glaucoma may occur with inherited disorders that affect other eye structures or other parts of the body.
Examples include conditions involving:
- FOXC1
- PITX2
- PAX6
- Anterior-segment dysgenesis
- Aniridia
- Axenfeld–Rieger syndrome
- Certain connective-tissue conditions
- Metabolic disorders
- Developmental syndromes
Clues that glaucoma may be syndromic include:
- Abnormal iris development
- Displaced pupils
- Dental abnormalities
- Facial differences
- Hearing problems
- Congenital cataract
- Retinal abnormalities
- Unusual body proportions
- Developmental delay
- Heart or kidney abnormalities
These patients may benefit from coordinated ophthalmic, paediatric, medical-genetic and genetic-counselling assessment.
Is Secondary Glaucoma Hereditary?
Secondary glaucoma is caused by another eye disease, medication, injury or procedure.
Examples include:
- Steroid-induced glaucoma
- Traumatic glaucoma
- Uveitic glaucoma
- Neovascular glaucoma
- Glaucoma following surgery
- Lens-related glaucoma
The immediate cause is not usually inherited.
However, genetic susceptibility may still influence the underlying condition or the individual response.
For example:
- Some people are genetically more likely to develop a pressure rise from steroids.
- Certain inherited retinal diseases may cause secondary glaucoma.
- Pseudoexfoliation syndrome has a genetic component, although its inheritance is complex.
- Inherited anatomical traits may influence angle closure.
What Information About My Relative’s Glaucoma Is Most Useful?
“Glaucoma” alone may not provide enough information.
Ask, where possible:
- What type of glaucoma was diagnosed?
- At what age?
- Was the pressure high or normal?
- Were the drainage angles narrow?
- Was laser peripheral iridotomy performed?
- Were glaucoma drops needed?
- Was trabeculectomy or tube surgery performed?
- Was the glaucoma caused by trauma or steroids?
- Was genetic testing performed?
- Did the person lose vision?
- Were both eyes affected?
A parent who developed mild open-angle glaucoma at age 82 creates a different family-risk pattern from a parent who required glaucoma surgery at age 25.
Does the Severity of a Relative’s Glaucoma Matter?
Yes.
A stronger inherited contribution should be considered when relatives have:
- Very young onset
- Extremely high pressure
- Rapid progression
- Severe disease in both eyes
- Visual loss despite treatment
- Repeated glaucoma surgery
- Several affected family members
- A confirmed disease-causing genetic variant
This does not prove that another family member will follow the same course, but it supports earlier and closer assessment.
Should Children Be Screened If a Parent Has Glaucoma?
It depends on the type and age of onset.
Parent with Typical Late-Onset Adult Glaucoma
An immediate specialised childhood glaucoma examination is not normally required solely because a parent developed ordinary glaucoma late in life.
However:
- The family history should be documented.
- Routine eye examinations remain important.
- Screening should become more deliberate as the child enters adulthood.
- Earlier assessment may be appropriate when other risk factors are present.
Parent with Juvenile or Early-Onset Glaucoma
Children should be assessed earlier.
The examination may begin during childhood or adolescence depending on:
- The parent’s age at diagnosis
- The type of glaucoma
- Pressure severity
- Whether a pathogenic variant has been identified
- Advice from the treating glaucoma specialist or genetic counsellor
Parent with Congenital or Syndromic Glaucoma
Genetic counselling and targeted paediatric assessment may be indicated.
At What Age Should Family Members Begin Glaucoma Screening?
There is no single age suitable for every family.
A practical approach is:
- Arrange a baseline comprehensive eye examination when a first-degree relative is diagnosed.
- Begin earlier when the affected relative developed glaucoma young.
- Screen children or adolescents when juvenile, congenital or strongly inherited glaucoma is present.
- Do not wait for symptoms.
- Repeat examinations at intervals based on findings and family risk.
The National Eye Institute advises people at higher glaucoma risk—including those with a family history—to undergo comprehensive dilated eye examinations every one to two years. Individual recommendations may be more frequent when suspicious findings are already present.
Is an Eye-Pressure Check Enough?
No.
A useful family-screening examination may include:
- Visual acuity
- Intraocular pressure
- Slit-lamp examination
- Optic-nerve examination
- Gonioscopy
- Corneal-thickness measurement
- Optic-disc photography
- OCT
- Visual-field testing when indicated
Pressure alone can miss:
- Normal-tension glaucoma
- Narrow angles with normal pressure
- Early optic-nerve damage
- Pressure fluctuations
- Underestimated pressure in thin or altered corneas
Why Is Gonioscopy Important for Family Screening?
Gonioscopy examines the drainage angle.
It can identify:
- Narrow angles
- Closed angles
- Peripheral anterior synechiae
- Pigmentation
- Previous trauma
- Abnormal blood vessels
This is particularly important when the affected relative has:
- Angle-closure glaucoma
- An acute glaucoma attack
- Laser iridotomy
- A shallow anterior chamber
- A short or long-sighted eye
Why Are OCT and Visual-Field Tests Sometimes Needed?
OCT assesses the optic nerve and retinal nerve-fibre layer.
Visual-field testing assesses functional side vision.
These tests may be needed when:
- The optic nerve appears suspicious
- The cup-to-disc ratio is large
- The nerves are asymmetrical
- Pressure is elevated
- A strong family history is present
- Baseline documentation is useful
- The patient has high myopia
- Progression is suspected
A normal initial result does not eliminate future risk.
Should Every Relative Have Genetic Testing?
No.
Genetic testing is not routinely required for most families with common adult-onset primary open-angle glaucoma.
In most adult cases:
- Many genes contribute small effects.
- A single negative test cannot exclude inherited risk.
- Current clinical examination predicts existing damage more directly.
- The result may not change treatment.
Genetic testing is more useful when the clinical findings suggest a Mendelian or single-gene disorder whose causative genes are known. The American Academy of Ophthalmology recommends offering testing when clinical findings suggest such an inherited condition and ensuring appropriate counselling and interpretation.
When May Genetic Testing Be Considered?
Testing may be useful when there is:
- Congenital glaucoma
- Juvenile open-angle glaucoma
- Glaucoma diagnosed before age 40
- Several affected family members across generations
- Very high pressure at a young age
- Unusually aggressive disease
- Glaucoma associated with developmental eye abnormalities
- A suspected genetic syndrome
- A known glaucoma-causing variant in the family
Testing may help:
- Confirm a diagnosis
- Estimate risk for relatives
- Determine who needs closer screening
- Guide genetic counselling
- Clarify the inheritance pattern
- Identify apparently unaffected carriers
What Is Cascade Testing?
Cascade testing begins after a disease-causing variant has been confirmed in an affected family member.
Close relatives are then offered testing for that specific variant.
For example, when a pathogenic MYOC variant is identified, testing relatives can help distinguish:
- Family members who carry the variant and need closer surveillance
- Family members who did not inherit that particular familial variant
Studies of MYOC families have shown that cascade testing can identify people at increased risk before irreversible visual loss develops.
The most informative person to test first is usually a clearly affected family member rather than an unaffected relative.
What Does a Positive Genetic Test Mean?
A positive test means that a disease-causing or likely disease-causing variant has been identified.
It may indicate:
- Increased risk of developing glaucoma
- A need for earlier surveillance
- A particular inheritance pattern
- Potential implications for children and siblings
It does not always reveal:
- The exact age of onset
- The eventual severity
- Whether surgery will be required
- Whether every carrier will develop disease
What Does a Negative Genetic Test Mean?
A negative test does not necessarily mean that the glaucoma is not hereditary.
Possible explanations include:
- The responsible gene is not yet known.
- The test did not cover every relevant genetic region.
- The disease is polygenic.
- The glaucoma was caused by a different mechanism.
- A variant is present but cannot yet be interpreted.
- The tested family member did not inherit the familial variant.
Clinical screening should not be stopped solely because a broad glaucoma panel is negative.
What Is a Variant of Uncertain Significance?
A variant of uncertain significance is a genetic change whose relationship to disease is not yet clear.
It should not automatically be treated as:
- Proof of glaucoma
- Proof that relatives will become affected
- A reason for preventive surgery
- A definite explanation for the family history
Interpretation may change as new scientific information becomes available.
Genetic results should be reviewed with an ophthalmologist, clinical geneticist or genetic counsellor familiar with inherited eye disease.
Are Consumer DNA Tests Useful for Glaucoma?
Direct-to-consumer genetic tests should not replace a clinical eye examination.
Possible limitations include:
- Testing only selected common variants
- Missing rare disease-causing variants
- Uncertain population applicability
- False reassurance from a “low-risk” result
- Anxiety from a “high-risk” result
- Lack of clinical interpretation
- No assessment of current optic-nerve damage
Polygenic risk scores are an active area of research and may eventually help identify people who would benefit from earlier or more frequent screening. They are not currently a substitute for pressure, optic-nerve, OCT, visual-field and angle assessment.
Can Lifestyle Prevent Hereditary Glaucoma?
There is no lifestyle measure that can completely neutralise inherited susceptibility.
General eye and health measures remain worthwhile:
- Attend regular eye examinations.
- Use prescribed glaucoma treatment consistently.
- Avoid unnecessary steroid use.
- Inform doctors about the family history.
- Protect the eyes from trauma.
- Control diabetes and vascular risk appropriately.
- Exercise regularly when medically suitable.
- Avoid smoking.
- Seek evaluation for significant sleep apnoea symptoms.
These measures do not replace screening or treatment.
Can Someone Reduce the Risk by Keeping Eye Pressure Low?
Lowering pressure is the established treatment for people with glaucoma and selected high-risk patients.
However, people without diagnosed glaucoma should not use pressure-lowering drops preventively without proper assessment.
The decision to treat a glaucoma suspect depends on:
- Pressure level
- Optic-nerve appearance
- OCT
- Visual field
- Corneal thickness
- Drainage angle
- Age
- Family history
- Estimated lifetime risk
Family history is one part of the decision rather than an automatic reason to begin medication.
Can Glaucoma Be Prevented If It Is Found Early?
Inherited susceptibility cannot always be prevented, but vision loss can often be reduced or avoided through:
- Early detection
- Regular monitoring
- Appropriate pressure lowering
- Good treatment adherence
- Timely laser or surgery
- Screening of relatives
Treatment cannot usually restore optic-nerve tissue already lost.
The advantage of family screening is the possibility of detecting disease before the patient notices any visual loss.
Should Relatives Be Told About the Diagnosis?
Yes.
A patient diagnosed with glaucoma should consider informing:
- Parents
- Siblings
- Adult children
Useful wording is:
“I have been diagnosed with glaucoma. Because close relatives have a higher risk, please arrange a comprehensive eye examination and tell the eye doctor about our family history.”
It is helpful to include the glaucoma subtype when known.
For example:
- Primary open-angle glaucoma
- Normal-tension glaucoma
- Angle-closure glaucoma
- Juvenile open-angle glaucoma
- Congenital glaucoma
- MYOC-related glaucoma
What If My Relative Refuses Screening Because Their Vision Is Good?
Explain that early glaucoma usually:
- Causes no pain
- Does not blur central vision
- Does not change the appearance of the eye
- Cannot be detected by symptoms alone
A person may still read the smallest letters on the eye chart while having significant peripheral visual-field damage.
The purpose of screening is to find glaucoma before it interferes with daily life.
What If the Family Member Lives Overseas?
The relative should arrange a comprehensive examination with an ophthalmologist or suitably equipped eye-care provider.
They should mention:
- The exact family diagnosis
- Age at diagnosis
- Whether surgery was needed
- Any confirmed genetic result
- Whether angle closure was involved
They may also bring a copy of the affected relative’s medical letter when available.
Frequently Asked Questions
Is glaucoma definitely hereditary?
No.
Many cases have a genetic contribution, but inheritance is not the only factor.
If no one in my family has glaucoma, am I safe?
No.
Glaucoma can occur without a known family history.
If my father has glaucoma, is my risk exactly 50%?
No.
A 50% transmission probability applies only to certain confirmed autosomal-dominant genetic conditions.
Ordinary adult open-angle glaucoma usually has complex inheritance.
Is risk greater if both parents have glaucoma?
It is likely higher than when only one parent is affected, although the exact risk depends on the glaucoma types and other clinical factors.
Is glaucoma inherited more strongly from the mother?
There is no general rule that maternal inheritance is stronger.
Both sides of the family matter.
Does a grandparent with glaucoma count?
Yes.
The relationship is more distant than a parent or sibling, but it remains relevant—especially if glaucoma developed young or several relatives are affected.
My relative had “high eye pressure.” Does that mean glaucoma?
Not necessarily.
They may have had:
- Ocular hypertension
- Primary open-angle glaucoma
- Angle closure
- Secondary pressure elevation
The exact diagnosis is useful.
My relative became blind. Was glaucoma definitely the cause?
Not always.
Possible causes include cataract, retinal disease, stroke, diabetic eye disease or macular degeneration.
Medical records may clarify the diagnosis.
If my relative had glaucoma surgery, does that mean mine will be severe?
No.
It indicates that the relative required more intensive pressure control, but family members may have different disease severity.
Can siblings have different glaucoma types?
Yes.
Family members may inherit overlapping anatomical and genetic risks but develop different clinical patterns.
Can only one family member be affected by a genetic form?
Yes.
A new genetic variant may arise for the first time, relatives may be too young, or other carriers may have incomplete penetrance.
Can glaucoma be diagnosed through a blood test?
No.
Blood-based genetic testing may identify selected inherited variants, but glaucoma diagnosis still requires clinical eye examination.
Should my child have genetic testing because I have glaucoma?
Not automatically.
Testing is more useful when you have congenital, juvenile, syndromic or confirmed single-gene glaucoma.
Does a negative genetic test mean my children are safe?
Not necessarily.
Most adult glaucoma cannot currently be excluded through one genetic test.
Should family members use my glaucoma drops preventively?
No.
Glaucoma medication should be used only after individual assessment and prescription.
Can LASIK or cataract surgery remove hereditary glaucoma risk?
No.
These procedures may alter vision or eye anatomy but do not remove inherited optic-nerve susceptibility.
Can glaucoma skip generations?
It can appear to because of incomplete penetrance, late diagnosis or undetected disease.
If my pressures are normal, do I still need screening?
Yes.
Normal-tension glaucoma and narrow-angle disease can occur without consistently elevated pressure.
Is glaucoma screening painful?
Most tests are painless.
Gonioscopy and pressure measurement may involve a numbing drop and brief contact with the eye.
How often should relatives be examined?
High-risk people are commonly advised to have comprehensive examinations every one to two years, but shorter intervals may be needed when pressure, optic nerves or angles are suspicious.
A Practical Family Screening Plan
Step 1: Clarify the Family Diagnosis
Find out:
- Type of glaucoma
- Age at diagnosis
- Pressure level
- Whether the angles were narrow
- Whether laser or surgery was needed
- Whether genetic testing was positive
Step 2: Identify First-Degree Relatives
Prioritise:
- Parents
- Siblings
- Children
Step 3: Arrange a Baseline Examination
The assessment should include more than a spectacle prescription or air-puff pressure check.
Step 4: Begin Earlier for Early-Onset Disease
Juvenile, congenital or strongly familial glaucoma may require screening during childhood, adolescence or early adulthood.
Step 5: Repeat Screening
A normal first examination does not guarantee lifelong protection.
Step 6: Consider Genetic Counselling
This is particularly relevant when:
- A disease-causing variant is known
- Glaucoma began young
- Several generations are affected
- Congenital or syndromic glaucoma is present
The Bottom Line
Glaucoma can be hereditary, but the inheritance pattern depends on the type.
Most common adult primary open-angle glaucoma is:
- Genetically influenced
- Multifactorial
- Associated with many small genetic effects
- Not explained by one single gene
Certain early-onset forms are more strongly inherited.
Examples include:
- MYOC-related juvenile open-angle glaucoma
- Some congenital glaucomas involving CYP1B1, LTBP2, TEK or other genes
- Rare familial normal-tension glaucoma associated with OPTN or TBK1
Family history increases risk but does not guarantee disease.
The relatives who deserve the greatest attention are:
- Parents
- Siblings
- Children
Screening should include:
- Eye pressure
- Optic-nerve examination
- Gonioscopy
- OCT and visual fields when indicated
- Continued monitoring over time
Genetic testing is most useful for congenital, juvenile, syndromic or strongly familial glaucoma. It is not yet a routine replacement for clinical screening in ordinary adult glaucoma.
The most valuable action after a glaucoma diagnosis may be telling close relatives. Glaucoma detected before symptoms develop can often be controlled before permanent visual loss occurs.
References
- American Academy of Ophthalmology. Primary Open-Angle Glaucoma Preferred Practice Pattern. 2025–2026.
- American Academy of Ophthalmology. Primary Angle-Closure Disease Preferred Practice Pattern. 2025–2026.
- National Eye Institute. Glaucoma: Risk Factors and Screening. Updated November 2025.
- Tielsch JM, et al. Family History and Risk of Primary Open-Angle Glaucoma: The Baltimore Eye Survey. Archives of Ophthalmology. 1994.
- Wolfs RCW, et al. Genetic Risk of Primary Open-Angle Glaucoma: Population-Based Familial Aggregation. Archives of Ophthalmology. 1998.
- Odayappan A, et al. Family Screening in Glaucoma: A Scoping Review. Ophthalmology Glaucoma. 2026.
- Amerasinghe N, et al. The Heritability and Sibling Risk of Angle Closure in Asians. Ophthalmology. 2011.
- Kolovos A, et al. Progress in Translating Glaucoma Genetics Into the Clinic. Experimental Eye Research. 2025.
- Sears NC, et al. Mendelian Genes in Primary Open-Angle Glaucoma. Experimental Eye Research.
- Pan Y, et al. Exploring the Genetic Landscape of Childhood Glaucoma. 2024.
- Stone EM, et al. Recommendations for Genetic Testing of Inherited Eye Diseases. Ophthalmology. 2012.
- Souzeau E, et al. Myocilin Predictive Genetic Testing for Primary Open-Angle Glaucoma Leads to Early Identification of At-Risk Individuals. Ophthalmology. 2017.
