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Cataract: when to operate — and when not yet?
Last updated: 20 August 2026
A cataract is the clouding of the eye's lens and belongs to ageing like grey hair: nearly everyone encounters it eventually. The operation is one of the most performed and safest procedures in the world. Which is exactly why the key question is rarely whether it can be done, but when it makes sense for you — and that's a decision worth taking calmly.
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In short
- A cataract is a clouding of the eye's lens; the process is slow and painless.
- Surgery is rarely urgent: the right moment depends on how much it bothers your daily life.
- The operation replaces your lens with an artificial one and is very safe — but every surgery has risks and choices.
- Doubts about the advice or the proposed lens? A second opinion before surgery is entirely normal.
⚠ Acute symptoms?Sudden vision loss, an eye injury, chemicals in the eye, severe pain, or new blind spots in your visual field? Don't wait for an online explanation — call your GP (huisarts), the out-of-hours GP service, or 112 immediately.
What exactly is a cataract?
Behind your pupil sits a clear lens that focuses the image. Over the years that lens slowly clouds — usually through ageing of the lens proteins. Vision gets hazier, colours fade, and glare (oncoming headlights at night!) becomes bothersome. A cataract doesn't hurt and usually doesn't damage the eye: it mainly makes vision ever duller.
How do you notice a cataract?
Gradually. Many people first think their glasses are dirty or outdated. Typical signs: hazy or misty vision that a new pair of glasses doesn't really fix, more trouble with glare and backlight, single-eye double vision, and needing more light to read. Sometimes your prescription changes remarkably fast — that too can be a cataract signal.
When is surgery sensible?
There is no magic threshold. The core question is: does it hinder your daily life — driving, reading, recognising faces, your work? Then surgery is worth considering. If it barely bothers you, waiting is almost always safe; operating 'in time because otherwise it's too late' is rarely an issue with modern techniques.
An honest conversation covers both sides: what you gain (clarity, colour, contrast, often less dependence on glasses) and what you should know (aftercare, the chance of secondary cataract, rare complications, and that a multifocal lens implant doesn't suit everyone).
Which questions do you ask before signing?
At minimum: why operate now, and what happens if I wait? Which lens implant is proposed — monofocal, toric, multifocal — and why does it fit my eyes and my life? What does it mean for my glasses after surgery? What are the risks in my specific situation (for instance with high myopia, glaucoma or macular problems)? And: will both eyes be done, in which order?
A good surgeon is happy to answer these. If you feel rushed or the answers stay vague — especially when extras are being sold — that is precisely the moment for a second pair of eyes on your file.
When is a second opinion worthwhile?
When in doubt about timing ("does this really have to happen now?"), about the proposed lens choice, when the explanation doesn't land, or when your measurements feel contradictory. Bring your data — biometry, eye pressure, an OCT if available — because a meaningful second opinion assesses the complete picture, not just the conclusion. And with sudden deterioration of vision you obviously don't wait for a second opinion but get seen immediately.
Frequently asked questions
Can a cataract come back after surgery?
The lens implant itself cannot cloud again. In some people the capsule behind the lens later clouds ('secondary cataract'); a short laser treatment usually fixes that well.
Does a cataract need to be 'ripe' before surgery?
That idea belongs to another era. With modern techniques a cataract doesn't need to ripen; the moment is determined by how much it bothers you, not by the thickness of the clouding.
How long is the recovery?
The procedure itself usually takes fifteen to twenty minutes per eye. Most people see clearly better within days and quickly resume normal life, with drops on schedule and some precautions in the first weeks.
Sources and further reading
This article is general explanation, not medical advice about your situation. For acute symptoms: call your GP, the out-of-hours GP service, or 112.