What Is a cataract? A cataract forms when the natural lens of the eye becomes blurred, often due to aging, high blood sugar, eye injury, specific medications, or long-term UV exposure. Common symptoms include dim vision, halos near lights, dull colours, frequent changes in spectacles, and difficulty with night driving. https://www.tumblr.com/medjournalhealthcare/816496736152502272/clear-vision-starts-here-advanced-cataract-eye