Inside the eye, behind the iris (the coloured part of the eye) is a lens. In the normal eye, the lens is clear or transparent, and helps to focus light rays on to the tissue at the retina at the back of the eye.

When a cataract develops, the lens becomes cloudy and prevents the light rays passing onto the retina. The picture that the retina receives becomes dull and fuzzy. Cataracts usually form slowly and people experience a gradual blurring of vision. Symptoms often develop very gradually over months or years.

Once you have been diagnosed and your cataract progresses to the point that it is interfering with daily activities and normal lifestyle, it is time to remove the cataract.

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• Contact Moorfields Private about Cataracts