Why does a cataract occur?

Why does a cataract occur?

Robert K. Maloney (Ophthalmologist) gives expert video advice on: Are cataracts preventable?; Will I get a cataract? and more...

A cataract is a haziness in the crystalline lens, or the natural lens of the eye. A cataract a natural part of ageing, and as the lens in the eye gets hazy it stops focusing light properly and your vision gets hazy.