Getting Used to New Glasses: What’s Normal in the First Two Weeks and When to Come Back
13 October 2026
07:18
Glaucoma is the condition that makes the strongest argument for having your eyes examined when nothing is wrong.
That is a strange sentence, so here is what sits behind it. The commonest form of glaucoma develops slowly, painlessly and without symptoms. It damages peripheral vision first, and the brain fills in missing areas so convincingly that people can lose a substantial amount without noticing anything at all. By the time someone becomes aware of a problem, meaningful damage has usually already happened.
And the damage does not reverse. Treatment is very effective at protecting the vision you still have, but it cannot restore what has gone. Everything therefore turns on finding it early, in somebody who feels completely fine.
Glaucoma is damage to the optic nerve, the bundle of fibres carrying visual information from the eye to the brain. As nerve fibres are lost, so are the parts of the visual field they served.
Raised pressure inside the eye is the best-known contributing factor, which is why the puff-of-air test exists. But the relationship is not simple, and this is where a lot of public understanding goes wrong.
Which is the point worth taking away: “my pressures were fine” is reassuring but not conclusive. Assessment looks at pressure, the appearance of the optic nerve, the visual field, and increasingly the structure of the nerve fibre layer itself.
If you read one section, this one.
Having a parent or sibling with glaucoma is among the strongest known risk factors. And yet when we ask patients about family history of eye disease, the most common answer by some distance is “I don’t know”.
That is entirely understandable. Eye conditions are not usually family conversation, older relatives often describe it vaguely as “something with my eyes”, and glaucoma in particular gets muddled with cataract in the retelling.
A genuinely useful thing to do this week: ask your parents whether anyone in the family has been treated for glaucoma. It takes one phone call, it changes how closely we look at you, and it is information you cannot get from any test.
If the answer is yes, tell your optometrist. It does not mean you will develop it. It means regular examination stops being a good idea and becomes an important one.
Risk factor | Why it matters | What to do |
|---|---|---|
A parent or sibling with glaucoma | Among the strongest known risk factors | Tell your optometrist; get checked regularly |
Aged over 40 | Risk rises steadily with age | Keep to at least two-yearly examinations |
Raised eye pressure | One factor, not a diagnosis on its own | Monitoring rather than alarm |
African or Caribbean family background | Higher risk and often earlier onset | Earlier and more regular examination |
Short sightedness | Associated with higher risk of some types | Mention it; it changes how closely we look |
Diabetes | Associated with increased risk | Annual examination, which you are entitled to |
Previous eye injury or long-term steroid use | Both can raise pressure | Tell your optometrist the history |
Risk factors are not predictions. Most people with one or two of these will never develop glaucoma. What they change is how often you should be examined and how closely we look.
This is where imaging has genuinely changed what an optometrist can do, and it is worth explaining properly rather than presenting as a premium extra.
A retinal photograph records the surface of the back of the eye, rather like an aerial photograph of a landscape. It is useful, and it shows the optic nerve head.
An OCT scan does something different. It captures a cross-section *beneath* the surface, layer by layer, rather like a core sample through that landscape. For glaucoma specifically, that allows measurement of the thickness of the retinal nerve fibre layer — the very tissue glaucoma destroys.
The practical consequence: structural thinning can often be detected before it produces a detectable gap in the visual field. Given that lost vision does not return, finding change at the structural stage rather than the functional stage is a meaningful difference. There is more on the technology in OCT eye scans explained.
A single scan is a snapshot. Its real value emerges over years, because glaucoma is diagnosed as much by change as by any single measurement. A scan from today compared against one from three years ago answers a question that no amount of examination today can: is this stable, or is it moving?
Which is an argument for going to the same practice, and for starting the record before there is anything to worry about.
Many practices offer OCT as a paid upgrade. We include it in the eye examination as standard, and the reasoning is straightforward: a test that is most useful as a repeated baseline is one that people should not be deciding about on price each visit.
It also has a practical consequence for comparing practices. An advertised price that excludes imaging is not comparable with one that includes it, which is a point we make in our piece on choosing an optician.
Worth setting out plainly, because uncertainty is what makes people avoid appointments.
Because our optometrists hold the Independent Prescribing qualification, we can also manage a range of other eye conditi
Chronic glaucoma is silent. There is a much rarer form that is not, and it is a genuine emergency.
Acute angle-closure glaucoma comes on rapidly with severe eye pain, redness, blurred vision, haloes around lights, and often headache, nausea or vomiting. It is uncommon, but it needs immediate attention — not an appointment next week.
Severe eye pain with blurred vision and haloes, particularly with nausea, should be treated as an emergency. Our page on emergency eye care explains what to do.
If any of the signs in the table are familiar, particularly the night-driving pattern, an eye examination is the way to find out. Ours run forty minutes, and refraction is done carefully rather than quickly, because small astigmatic corrections are precisely the thing a rushed appointment rounds off.
Tell us what you have noticed rather than waiting to be asked. “Headlights have started streaking” directs the examination far better than “fine, thanks”. Our walkthrough of what happens at an eye test explains each stage if you want to know what to expect.
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Mosspark Opticians today.
The common form usually has no symptoms at all until damage is advanced. It affects peripheral vision first, and the brain compensates so effectively that substantial loss can go unnoticed. This is why examination matters when you feel completely well. A much rarer acute form causes severe pain, redness, haloes and often nausea, and is a medical emergency.
Family history is among the strongest known risk factors. Having a parent or sibling with glaucoma meaningfully increases your own risk. It does not mean you will develop it, but it does mean regular examination is important rather than optional. Most people have never asked their parents, and it is worth one phone call.
Yes. Normal-tension glaucoma is well recognised, which is why a pressure reading alone is not a screening test for the condition. Equally, raised pressure without nerve damage is called ocular hypertension and is monitored rather than diagnosed as glaucoma. Assessment looks at pressure, the optic nerve, the visual field and nerve fibre structure together.
A retinal photograph records the surface of the back of the eye. An OCT scan captures a cross-section beneath that surface, layer by layer, which allows measurement of the retinal nerve fibre layer — the tissue glaucoma damages. Structural thinning can often be detected before it produces a detectable gap in the visual field.
as by any single measurement. That argues against treating it as an optional extra decided on price at each visit. We include OCT in our examination as standard, which also means an advertised price elsewhere that excludes imaging is not directly comparable.
No. Damage to the optic nerve does not reverse, and treatment is aimed at protecting the vision that remains rather than recovering what has gone. That is precisely why early detection matters so much, and why examination while you still feel fine is the point rather than a precaution.
Tell your optometrist about the family history and they will advise an interval for you, which is commonly annual rather than two-yearly. In Scotland, NHS-funded eye examinations are available to everyone living in the UK, so more frequent examination where clinically advised is not usually a cost question.
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