A cataract is a clouding of the eye's natural lens that causes blurry or dim vision. Cataracts develop when the lens proteins become damaged over time due to aging, eye injuries, medical conditions, or other risk factors. Common symptoms include blurred vision, glare from lights, and frequent prescription changes. Cataract surgery removes the cloudy lens and replaces it with an artificial lens, restoring clear vision. Recovery requires following precautions like using eye drops as directed and avoiding irritants or strenuous activity.