Glaucoma can run in families. Having a parent, sibling, or close relative with glaucoma does not mean you will definitely develop the condition, but it may increase your risk. This is why family history is one of the factors doctors consider when advising patients on glaucoma screening and follow-up.
Glaucoma is a group of eye conditions that damage the optic nerve. The optic nerve carries visual signals from the eye to the brain. In many cases, glaucoma develops gradually and may not cause obvious symptoms in the early stages. Some patients may only notice vision changes when the condition has already progressed.
What Is Glaucoma?
Glaucoma refers to optic nerve damage that can lead to vision loss. It is commonly linked to raised pressure inside the eye, known as intraocular pressure, although some people may develop glaucoma even when eye pressure is within the usual range.
Glaucoma can affect side vision first. Because the brain may adjust to gradual changes, patients may not realise there is a problem until the condition is more developed. Vision loss from glaucoma is usually irreversible, so regular monitoring and early detection are important.
Is Glaucoma Hereditary?
Glaucoma can have a hereditary component. This means that family history may increase a person’s risk, especially if a close relative has glaucoma.
Family history may be relevant if:
- A parent has glaucoma
- A sibling has glaucoma
- More than one family member has glaucoma
- A relative developed glaucoma at a younger age
- A relative lost vision from glaucoma
- There is a known family pattern of eye pressure or optic nerve disease
However, glaucoma is not caused by family history alone. Other factors such as age, eye pressure, ethnicity, high myopia, diabetes, steroid use, previous eye injury and certain eye conditions may also affect risk.
Why Family History Matters
Family history matters because glaucoma may develop quietly. If one person in the family has been diagnosed, close relatives may benefit from being more aware of their own eye health.
Relatives may not have symptoms, but screening can check for early signs such as:
- Raised eye pressure
- Optic nerve changes
- Visual field changes
- Narrow drainage angles
- Risk factors that need monitoring
A family history of glaucoma does not always mean treatment is needed. In some cases, the doctor may recommend monitoring at suitable intervals.
Who in the Family Should Consider Screening?
Close relatives of someone with glaucoma may consider an eye assessment, especially if they are adults or have additional risk factors.
Family members who may benefit from screening include:
- Parents
- Siblings
- Adult children
- Relatives with high myopia
- Relatives with diabetes
- Relatives with previous eye pressure concerns
- Relatives who use long-term steroid medication
- Relatives with previous eye injury
- Older adults in the family
If glaucoma was diagnosed at a younger age in the family, relatives may wish to ask an ophthalmologist when screening should begin.
Does Glaucoma Always Cause Symptoms?
No. Many patients with glaucoma do not notice symptoms in the early stages. This is one reason family-risk screening matters.
Possible symptoms in more developed glaucoma may include:
- Loss of side vision
- Difficulty noticing objects from the side
- Bumping into objects
- Trouble navigating steps or kerbs
- Reduced vision in later stages
- Difficulty with driving or moving through crowded spaces
Some types of glaucoma can present suddenly. Acute angle-closure glaucoma may cause severe eye pain, red eye, blurred vision, halos around lights, headache, nausea, or vomiting. This requires urgent medical attention.
Main Risk Factors for Glaucoma
Family history is one risk factor, but it is not the only one. A person may have a higher risk of glaucoma if they have:
- Older age
- Family history of glaucoma
- Raised eye pressure
- High myopia
- Diabetes
- Previous eye injury
- Long-term steroid use
- Thin corneas
- Previous eye surgery
- Certain eye anatomy, such as narrow drainage angles
- Existing optic nerve concerns
A personalised eye assessment can help identify which risk factors apply.
What Tests May Be Done for Glaucoma Screening?
Glaucoma screening may involve several tests. One test alone may not be enough to diagnose or rule out glaucoma.
An eye specialist may recommend:
- Eye pressure measurement
- Optic nerve examination
- Slit lamp examination
- Dilated eye examination where needed
- Optical coherence tomography
- Visual field testing
- Corneal thickness measurement
- Drainage angle assessment
- Fundus photography
These tests help the doctor assess both structure and function of the optic nerve.
Eye Pressure Measurement
Eye pressure is an important part of glaucoma assessment. Raised eye pressure can increase the risk of optic nerve damage, but not everyone with high eye pressure has glaucoma.
Some patients with glaucoma may also have eye pressure within the usual range. This is why eye pressure measurement should be interpreted together with optic nerve findings, visual field results and other risk factors.
Optic Nerve Examination
The optic nerve can show signs of glaucoma-related damage. During an eye examination, the ophthalmologist may assess the appearance of the optic nerve and compare both eyes.
Optic nerve imaging may also be used to document findings and monitor changes over time.
Visual Field Testing
Visual field testing checks side vision and other areas of the visual field. Since glaucoma may affect peripheral vision first, this test can help detect functional vision changes.
The test may need to be repeated over time because doctors often look for patterns and progression rather than relying on one result alone.
Optical Coherence Tomography
Optical coherence tomography, or OCT, is an imaging test that assesses structures such as the optic nerve and retinal nerve fibre layer. It can help detect or monitor structural changes linked to glaucoma.
OCT results are usually reviewed together with other clinical findings. Factors such as high myopia, cataracts, scan quality and individual eye anatomy may affect interpretation.
How Often Should Family Members Be Screened?
There is no single screening interval that applies to everyone. The timing depends on age, eye findings, family history, eye pressure, optic nerve appearance, medical history and other risk factors.
A person with a family history but normal eye findings may only need periodic monitoring. Someone with raised eye pressure, suspicious optic nerves, or abnormal visual field results may need closer follow-up.
Patients should ask:
- When should I start glaucoma screening?
- How often should I repeat screening?
- Are my eye pressure readings normal for me?
- Do my optic nerves look healthy?
- Do I need OCT or visual field testing?
- Should my siblings or children be checked?
Can Hereditary Glaucoma Be Prevented?
Family history cannot be changed, but glaucoma-related vision loss may be reduced through early detection, monitoring and treatment where needed. The goal is to identify risk early and manage eye pressure or other findings before major vision loss occurs.
Steps that may help include:
- Going for eye screening if there is family history
- Attending follow-up appointments
- Using prescribed eye drops correctly
- Informing the doctor about steroid medication use
- Managing diabetes and other chronic conditions
- Wearing protective eyewear during activities with eye injury risk
- Seeking care early for sudden eye symptoms
Patients should avoid self-medicating with steroid eye drops unless prescribed by a doctor.
What If You Are Diagnosed as a Glaucoma Suspect?
A glaucoma suspect is someone who has findings that may suggest increased glaucoma risk but may not meet full diagnostic criteria. This may include raised eye pressure, suspicious optic nerve appearance, narrow angles, or other findings.
Being labelled a glaucoma suspect does not always mean a person has glaucoma. It usually means monitoring is needed.
Follow-up may include:
- Repeat eye pressure checks
- Visual field testing
- OCT scans
- Optic nerve photography
- Review of family history
- Discussion of treatment if risk increases
Patients should attend follow-up even if vision feels normal.
What Treatment Options May Be Discussed?
If glaucoma is diagnosed, treatment usually aims to lower eye pressure and reduce the risk of further optic nerve damage.
Treatment may include:
- Prescription eye drops
- Laser treatment in selected cases
- Surgery in selected cases
- Monitoring without immediate treatment for selected low-risk cases
- Medication adjustment if side effects occur
- Long-term follow-up
The suitable option depends on the type of glaucoma, severity, eye pressure, optic nerve condition, visual field results, age, medication tolerance and overall eye health.
Glaucoma Care in Singapore
Singaporeans with a family history of glaucoma may consider discussing screening with an ophthalmologist, especially if they have other risk factors such as high myopia, diabetes, raised eye pressure, or previous abnormal eye findings.
Dr Leo Adult & Paediatric Eye Specialist provides glaucoma diagnosis and follow-up as part of its eye care services. Patients with a family history of glaucoma can discuss whether screening, monitoring, or further testing is suitable based on their risk profile.
When to Seek Urgent Eye Care
Most glaucoma screening can be done through planned appointments. However, some symptoms need urgent attention.
Seek urgent medical care if there is:
- Sudden vision loss
- Severe eye pain
- Red eye with blurred vision
- Halos around lights
- Sudden headache with eye symptoms
- Nausea or vomiting with eye pain
- Sudden onset of many floaters
- Flashes of light
- Curtain-like shadow over vision
- Eye injury
- Chemical exposure to the eye
These symptoms should not wait for routine screening.
Glaucoma can be hereditary, and having a close family member with glaucoma may increase a person’s risk. However, family history does not mean glaucoma is certain. Age, eye pressure, optic nerve health, high myopia, diabetes, steroid use and other factors may also affect risk.
Because glaucoma may not cause symptoms in the early stages, Singaporeans with a family history should consider eye screening and ask an ophthalmologist how often follow-up may be needed. Screening may include eye pressure measurement, optic nerve examination, OCT imaging, visual field testing and other assessments where suitable.
Early detection and regular monitoring can help guide timely treatment and reduce the risk of further vision loss. Patients should also seek urgent care for sudden eye pain, red eye with blurred vision, halos, sudden vision loss, flashes, floaters, or curtain-like shadow over vision.
FAQ
Is glaucoma hereditary?
Glaucoma can run in families. Having a close relative with glaucoma may increase your risk, but it does not mean you will definitely develop the condition.
Should my family members be screened if I have glaucoma?
Close relatives such as siblings, parents and adult children may consider eye screening, especially if they have other risk factors such as older age, high myopia, diabetes, or raised eye pressure.
Can glaucoma develop without symptoms?
Yes. Many patients do not notice symptoms in the early stages. This is why regular eye checks are important for people with higher risk.
What tests are used to check for glaucoma?
Glaucoma assessment may include eye pressure measurement, optic nerve examination, visual field testing, OCT imaging, corneal thickness measurement and drainage angle assessment.
Can hereditary glaucoma be prevented?
Family history cannot be changed, but early detection, monitoring and treatment may help reduce the risk of further optic nerve damage and vision loss.
When is glaucoma an emergency?
Seek urgent care for severe eye pain, red eye with blurred vision, halos around lights, headache, nausea, vomiting, or sudden vision reduction.
This article is for general information only and should not replace medical advice from a qualified healthcare professional.
