Glaucoma: the eye condition that gives almost no early warning

Most eye problems tell you they exist. Something hurts, something blurs, something looks wrong in the mirror. Glaucoma is different, and that difference is the reason it matters so much. In its most common form, it damages your sight slowly, painlessly, and from the edges inward — where you are least likely to notice.

What glaucoma actually is

Glaucoma is a group of conditions that damage the optic nerve, the cable carrying visual information from your eye to your brain. It is often linked to pressure inside the eye being higher than that particular nerve can tolerate.

The important detail: there is no single pressure number that means you have it or do not. Some people develop glaucoma at pressures considered normal. Others live for years at higher pressures without nerve damage. This is why an eye test looks at the nerve itself, not just a pressure reading.

Why you would not notice

Open-angle glaucoma, the most common type, takes peripheral vision first. Your central vision — the part you read and recognise faces with — stays clear until late. Your brain also fills in gaps between your two eyes, so one eye can quietly cover for the other for a long time.

There is no pain. Nothing looks cloudy. You do not wake up one morning with a symptom that sends you to a clinic. People commonly discover it at a routine eye test they booked for a completely different reason.

The other hard fact: sight already lost to glaucoma does not come back. Treatment works by protecting what remains. That is why finding it early changes the outcome so much.

The version that is an emergency

A less common form, angle-closure glaucoma, can come on suddenly and is a genuine medical emergency. Go to a hospital or eye emergency service immediately if you have:

• Sudden severe eye pain, often with headache
• Nausea or vomiting alongside the eye pain
• Rainbow-coloured halos around lights
• A red eye with vision that has blurred quickly

Do not wait for an appointment slot for these symptoms. Hours matter.

Who should be paying attention

Risk is not evenly spread. Have your eyes checked regularly, and mention these at your test:

• Age. Risk rises from around 40 and keeps rising after 60.
• Family history. A parent or sibling with glaucoma raises your risk meaningfully. This is the single question most people have never been asked.
• Diabetes.
• A high myopic prescription.
• Long-term steroid use, including eye drops taken without supervision.
• Previous eye injury or eye surgery.

What an eye test is actually looking for

Screening for glaucoma is not one test. It is a set of findings read together:

• Eye pressure. A measurement of the pressure inside the eye — useful as one input, never the whole answer.
• The optic nerve head. Your optometrist looks directly at the nerve for the pattern of change glaucoma causes. This is why the visual health step of an eye exam is not a formality.
• Visual field testing. Mapping your peripheral vision to find gaps you have not consciously noticed.
• Imaging. Scans that measure the nerve fibre layer, which can show thinning before a field defect appears.

Anything suspicious is referred to an ophthalmologist, who diagnoses and manages treatment. Treatment usually starts with prescription drops to lower pressure, with laser or surgical options where drops are not enough. None of that is our decision to make — our job is to find the signal and get you to the right doctor.

What to do about it

If you are over 40, or anyone in your family has glaucoma, do not wait for a symptom. There will not be one until the damage is done.

Book a Vision7 eye test at your nearest Vision Express store. Our seven-step comprehensive eye exam includes a visual health examination and starts with a full case history, so family risk gets recorded and acted on. Ask about our VisionPlus screening if you want the more detailed imaging view.

For everyday UV protection, ask for Essilor Photochromic Elements White 1.56 at the counter — clear indoors, darkening automatically in the Philippine sun, so your eyes get UV cover on every commute without carrying a second pair. If you would rather have a Transitions-branded lens with a hard multi-coat, ask about Essilor Transitions Classic HMC 1.56. Both come with free lifetime ultrasonic cleaning and fitting adjustments.