Answers to the Common Questions on Cataracts

Clouding of the lens inside the eye, causing gradually blurred or dimmed vision.

Key takeaways

• Typical symptoms: gradual blurring, glare, haloes, faded colours
• Treatment: day-case surgery replacing the lens
• Most useful single change: Have regular eye tests so change is tracked.
• Commonest mistake: Waiting until vision is severely impaired before discussing surgery.
• See a doctor if any of the signs under "When to speak to a doctor" below apply to you.

What is Cataracts?

Clouding of the lens inside the eye, causing gradually blurred or dimmed vision.

Why does it matter?

It is the most common cause of treatable sight loss worldwide, and surgery is quick, routine and highly effective.

Typical symptoms for Cataracts?

Gradual blurring, glare, haloes, faded colours.

What is the single most useful thing to do?

Have regular eye tests so change is tracked.

What is the most common mistake?

Waiting until vision is severely impaired before discussing surgery.

When should I see a doctor?

Seek same-day help for sudden vision loss, flashes, a sudden shower of floaters, or a curtain across vision — cataracts cause gradual change, so anything sudden is something else. After surgery, seek urgent advice for increasing pain, redness or worsening vision, which can indicate infection.

Where to go next

• The Evidence on Cataracts, Without the Hype
• Understanding Cataracts: A Plain-English Explainer
• Cataracts — the reference entry
• Macular Degeneration: What the Evidence Actually Says
• The Evidence on Screen Use and Eyes, Without the Hype

When to speak to a doctor

Seek same-day help for sudden vision loss, flashes, a sudden shower of floaters, or a curtain across vision — cataracts cause gradual change, so anything sudden is something else. After surgery, seek urgent advice for increasing pain, redness or worsening vision, which can indicate infection.

Where this comes from

• NICE — Cataracts in adults: management
• NHS — Cataract surgery

How this page was put together

Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.

Medical disclaimer

This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.