Glaucoma is a disease that progressively damages the optic nerve. Early symptoms are hard to notice because peripheral vision narrows gradually — which is why an annual eye exam is the most reliable way to catch it in time. Risk factors include age, genetics, underlying conditions like diabetes, and severe nearsightedness or farsightedness — but the single most important factor is abnormally high eye pressure, which needs ongoing monitoring. Glaucoma cannot be completely cured, but its progression can be controlled with proper, timely treatment from an experienced ophthalmologist
What Is Glaucoma & Types of Glaucoma
Open-angle glaucoma: The most common form. It develops when the eye's internal drainage system deteriorates, causing eye pressure to rise and slowly damage the optic nerve. It typically shows no early warning signs — vision just gradually blurs — but catching it early can preserve most of your sight. Angle-closure glaucoma: Caused by an abnormal eye structure that blocks fluid drainage. An acute attack causes severe eye pain, redness, blurred vision, halos around lights, and sometimes nausea or vomiting. This is a medical emergency that requires immediate treatment to prevent permanent blindness. Glaucoma in infants and young children: Caused by congenital eye abnormalities. Parents may notice the child's eyes look larger than normal, along with light sensitivity, excessive tearing, and a cloudy or hazy cornea. This needs prompt evaluation by an ophthalmologist Secondary glaucoma: Triggered by other eye conditions or outside factors — abnormal pigment blocking the drainage channels, chronic eye inflammation, an overripe cataract, severe trauma, long-term steroid eye drop use, or complications after eye surgery. Diabetes, if left unmanaged, can affect your vision. Read more: Diabetic Retinopathy
Causes of Glaucoma
What types of retinal diseases are there? Can they be prevented? Read more here: Retinovitreous
What Are the Symptoms of Glaucoma?
Sudden, severe eye pain and redness Halos or rainbow-colored rings around lights A swollen or cloudy-looking cornea Intense headache Nausea and vomiting, caused by the sudden spike in eye pressure
Risk Factors for Glaucoma
Family history: Having an immediate family member with glaucoma raises your own risk of inheriting a glaucoma-prone eye structure. Age: Risk increases significantly after age 40, though glaucoma can occur earlier if other risk factors are present. Race/ethnicity: Research shows people with darker skin tones have a higher likelihood of developing glaucoma than other groups. Abnormal eye structure: Congenital differences, such as a small lens or a narrow anterior chamber, can raise eye pressure. Severe refractive errors: Severe nearsightedness (beyond -6.00 D) is often linked to a larger eyeball and thinner retina, making the optic nerve more vulnerable to pressure damage. Severe farsightedness from a young age is often linked to a smaller eyeball and narrow drainage angle, raising the risk of angle-closure glaucoma. Underlying health conditions: Diabetes, heart disease, high blood pressure, and poor circulation can accelerate glaucoma development. Eye trauma: A serious injury to the eye can cause long-term damage to its drainage system.
Vision With Glaucoma Look Like?
What is Pterygium? Can It Be Cured?
Can Glaucoma Cause Blindness?
Age-Related Macular Degeneration: A Condition Older Adults Should Watch For: Age-Related Macular Degeneration
Diagnosis of Glaucoma
Vision and refraction testing: Establishes a baseline to track future changes. Tonometry: The most critical test, since eye pressure is the one risk factor that can actually be controlled. Ophthalmoscopy: Checks the shape and condition of the optic disc, the structure directly affected by glaucoma. Visual Field: Measures peripheral vision to detect narrowing or blind spots. Gonioscopy: Uses a special lens to evaluate the eye's drainage angle and guide treatment planning. OCT (optical coherence tomography): Advanced imaging that precisely measures the thickness of the optic nerve fiber layer, allowing doctors to track disease progression with accuracy.
How Is Glaucoma Treated?
Pressure-lowering medication: The most common first-line treatment — eye drops, oral medication, or injections that reduce fluid production or improve drainage. Effective, accessible, and generally very safe. Laser: Improves fluid drainage, either alone or alongside pressure-lowering medication. Surgery: Considered when medication or laser treatment isn't enough to control pressure. Creates a new drainage pathway to relieve pressure on the optic nerve — typically used for more severe cases. Ongoing monitoring: Regular eye pressure checks and visual field tests let your ophthalmologist track treatment effectiveness and adjust your plan as needed.
How to Prevent Glaucoma
Get regular eye exams: Anyone 40 or older should have their eye pressure and optic nerve checked at least once a year. Those with a family history should start screening earlier and follow their doctor's recommended schedule. Watch for warning signs yourself: Test each eye separately from time to time. Blurring, narrowing vision, or halos around lights are reasons to see an ophthalmologist right away — don't wait for eye pain. Don't self-medicate with eye drops: Especially steroid-containing drops, which can rapidly raise eye pressure with prolonged use and trigger secondary glaucoma. Manage underlying conditions: Keeping diabetes, high blood pressure, and heart disease under control helps protect blood flow to the optic nerve. Protect your eyes from injury: Wear protective eyewear during high-risk activities like fast-ball sports or work involving flying debris.
Glaucoma Is a Silent Threat: Get Screened at Thai Eye Hospital
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Frequently Asked Questions (FAQs)
How long does it take for glaucoma to cause blindness?
Can glaucoma be cured?
Is glaucoma surgery dangerous?
Mayo Clinic Staff. (2024, November 5). Glaucoma, . Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/glaucoma/symptoms-causes/syc-20372839 Anju Goyal, MD. (2026, March 4). Understanding Glaucoma: Symptoms, Causes, Diagnosis, Treatment. American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/what-is-glaucoma Glaucoma, . (2025, November 26). National Eye Institute. https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/glaucoma
