The drops you must not stop

Glaucoma treatment is effective. Lowering the pressure inside the eye slows or halts the loss of optic nerve fibres, and most people diagnosed and treated early keep useful sight for the rest of their lives.

The commonest reason treatment fails is not that the drops do not work. It is that they are not used.

Why adherence is so poor

Studies across many countries consistently find that a large proportion of glaucoma patients do not take their drops as prescribed, and that a substantial number stop entirely within the first year. The reasons are all understandable:

The condition has no symptoms. You feel exactly the same treated or untreated. There is no daily reminder that anything is wrong and no reward for compliance — nothing improves, because the aim is that nothing happens.

The drops have side effects and the disease does not. Stinging, redness, a gritty feeling, darkening of the eyelid skin, lashes growing longer, and occasionally a change in iris colour. It feels like trading comfort for nothing.

They are difficult to instil. Older hands shake. Arthritic hands cannot squeeze the bottle. People genuinely cannot tell whether the drop went in.

Cost. They are a permanent, recurring expense, and when money is short, medication for a condition causing no symptoms is an obvious candidate to skip.

The regimen is complicated — different bottles at different times, some once daily, some twice.

What is actually at stake

Optic nerve fibres do not regenerate. Sight lost during a period without treatment is gone, and resuming the drops does not recover it — it only protects what remains.

This is the part that is often not stated plainly enough at diagnosis. Glaucoma treatment is not like a course of antibiotics, and it is not like paracetamol for a headache. It is a permanent arrangement, and the benefit is invisible by design.

What helps

Attach it to something you already do. Beside the toothbrush, with the evening meal, on the phone charger. A routine that already exists is more reliable than an intention.

Learn the punctal occlusion technique. After instilling the drop, close the eye gently and press a fingertip at the inner corner, against the nose, for a minute or two. This keeps the drop on the eye rather than draining into the nose and being absorbed systemically — it improves the effect and reduces the side effects. Few people are taught this, and it takes thirty seconds to learn.

One drop is enough. The eye cannot hold more. A second drop straight after mostly runs down your face and empties the bottle faster. If two different drops are prescribed, leave five minutes between them, or the second washes the first out.

Say if the side effects are the problem. There are several classes of glaucoma medication and a preservative-free option for most. Switching is usually possible. Practitioners cannot act on a difficulty they have not been told about, and they would far rather change the drop than discover a year later that it was never used.

Say if the cost is the problem. Alternatives differ in price, and laser trabeculoplasty is a one-off procedure that can reduce or remove the need for drops in suitable patients. That conversation cannot happen if the reason for stopping is not disclosed.

Ask about laser as a first option. There is now good evidence that laser treatment can be a reasonable initial approach, avoiding the daily regimen entirely for some patients.

Enlist somebody. A family member who asks, or who instils the drops where hands are unsteady, changes the odds considerably.

For families

If a relative has glaucoma, two things follow. Help them keep to the treatment — and get your own eyes examined, because a first-degree relative with glaucoma raises your risk several times over. That second point is frequently missed in the same household where the first is being diligently attended to.