A cataract is a cloudy area in the lens of the eye. It often develops slowly with age and can make reading, driving at night or recognizing faces harder. A change in vision deserves an eye examination because other conditions can cause similar symptoms.
What changes might you notice?
- Blurred or hazy vision and colors that look less vivid.
- More glare from headlights or bright light, halos, and trouble seeing at night.
- Frequent changes to your glasses prescription.
Early cataracts may cause little or no trouble. They can affect one or both eyes but do not spread between eyes.
When should you book an eye examination?
Arrange an assessment if your vision changes or daily tasks become difficult. An eye care professional can examine the lens, usually as part of a dilated eye examination, and check for other eye problems. Tell them whether the change is gradual or sudden and whether you have diabetes, use steroid medicine or have had an eye injury.
What can help before surgery?
Brighter lighting, anti-glare sunglasses, magnification for reading and an updated glasses prescription may help while a cataract is mild. These measures do not remove the cloudy lens. Ask for advice if driving, reading or other important activities remain difficult.
How do you decide about surgery?
Surgery is the only way to remove a cataract. It is often considered when vision loss interferes with activities such as reading or driving. You usually have time to discuss the likely benefits and risks with your eye specialist. The cloudy lens is replaced with an artificial lens. Ask what vision to expect afterward, whether you may still need glasses and how other eye conditions could affect the result.
What happens after surgery?
Your team will explain eye drops, protection and follow-up visits. Arrange a ride home after the procedure. Contact your eye care team promptly for worsening vision, severe pain, marked redness, flashes or many new floaters after surgery.
When is urgent help needed?
A cataract usually changes vision gradually. Sudden vision loss, severe eye pain, a dark curtain across vision, new flashes with many floaters or a significant eye injury needs urgent eye assessment for another possible cause.
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Last reviewed: 28 September 2026. This page provides general health information and does not replace individual medical assessment or treatment.