A cataract is a clouding of the eye's lens that develops over time, usually as you age. The lens sits behind the colored part of your eye and focuses light onto the retina at the back. When proteins in the lens clump together, they scatter light instead of letting it pass through clearly, causing blurry or dim vision. Cataracts are common—most people develop them eventually if they live long enough—and they're one of the leading causes of vision loss worldwide.
These articles explain how cataracts form, what symptoms to watch for, and how doctors diagnose them. You'll learn about risk factors beyond age, including diabetes, certain medications, and eye injuries. The guides also cover what happens during a cataract exam, how vision changes as a cataract progresses, and what treatment options exist when the cloudiness starts affecting your daily life.