Glaucoma can be quiet—and the damage cannot be rewound
Glaucoma is damage to the optic nerve. Eye pressure is the main risk factor we can change, but glaucoma is not simply “high pressure.” A person can have nerve damage at a statistically normal pressure, or high pressure without established glaucoma.
Early open-angle glaucoma often gives no warning. You cannot rule it out with an online symptom test.
Pressure-lowering treatment can protect the nerve that remains; it cannot restore nerve fibres already lost. That is why treatment and lifelong monitoring matter even when vision still feels normal.
Why this changes the IOL discussion
A patient may still read the smallest high-contrast letters and yet lose contrast or parts of the visual field. That matters when choosing an IOL. Adding an optical trade-off to an optic nerve with limited reserve may feel very different from adding it to a healthy eye.
Glaucoma assessment checks both structure and function. The optic nerve carries visual signals to the brain; examination and scans look for damage. A visual-field test maps which areas you can notice while looking straight ahead. Pressure and corneal thickness help interpret pressure-related risk. Gonioscopy examines the drainage angle where fluid leaves the front of the eye. No single number tells the whole story.
Treatment is a sequence, not a universal ladder
Treatment aims to lower pressure enough to reduce the chance of further damage. The right sequence can include selective laser trabeculoplasty (SLT), a laser procedure intended to help fluid drain and lower pressure, as well as drops, minimally invasive glaucoma surgery, or conventional surgery. It is outdated to say that drops must always come first and surgery is only a last resort.
For appropriate newly diagnosed ocular hypertension and non-advanced open-angle glaucoma, NICE includes 360-degree SLT as a first-line option. That does not make SLT the first choice for every glaucoma type, pressure target, or health system.
Cataract surgery may lower pressure in some eyes and can be combined with a glaucoma procedure, but it is not a universal glaucoma treatment. Combined surgery can also change healing and refractive predictability.
Questions for the glaucoma and cataract team
- What type and stage do I have, is it stable, and what pressure are we aiming for?
- Should cataract surgery be done alone or with a glaucoma procedure, and how might that affect the result?
- Which IOL fits the function I need to protect, and will it affect future tests or treatment?
Sudden severe eye pain, headache, nausea, blurred vision, coloured rings around lights, or a red eye can indicate acute angle closure and needs emergency assessment.
Sources: NICE glaucoma recommendations NG81; National Eye Institute: laser treatment for glaucoma; ESCRS cataract-surgery guideline; systematic review of premium IOLs in glaucoma.