It’s a cloudy area in the lens of your eye. It can make your vision dim, blurry, or cloudy, and colors might look faded. A cataract also might make you more sensitive to light, or you might have trouble seeing at night. They typically begin to form around age 40 as proteins in the lens start to break down. Most people don’t notice any vision changes until after age 60, but sometimes they can grow faster and cause issues earlier.