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Cataract and cataract surgery icon

Cataracts cause half of all cases of blindness and 33% of visual impairment worldwide.

A cataract is a clouding of the lens in the eye which leads to a decrease in vision. Cataracts often develop slowly and can affect one or both eyes. The underlying mechanism involves the accumulation of clumps of protein or yellow-brown pigment in the lens that reduces the transmission of light to the retina at the back of the eye.

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symptom of cataracts: cloudy lens in the eyes
Symptoms of cataracts
  • Faded colours,
  • blurry or double vision,
  • halos around light,
  • trouble with bright lights,
  • and trouble seeing at night.

Cataracts may result in trouble driving, reading, or recognising faces.


Cataracts are most commonly caused due to aging but may also occur due to trauma or radiation exposure, be present from birth, infections, certain medications, or occur following eye surgery for other visual problems.

Risk factors
Smoking tobacco
Prolonged exposure to sunlight
Related issues

Poor vision caused by cataracts may also result in an increased risk of falling and depression.

Cataract treatment
Prevention includes wearing sunglasses and avoiding smoking
Early on symptoms of cataracts may be improved by wearing glasses
If glasses do not improve vision then surgery to remove the cloudy lens and replace it with an artificial lens is an effective treatment

Cataracts: Book a consultation

Should you notice any symptoms of cataracts, or feel you could be at risk, we recommend making an appointment with an ophthalmologist.

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Frequently asked questions

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Post-cataract surgery care

All the information needed before, the day of and after cataract surgery.

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