What exactly is a cataract?
A cataract is a clouding of your natural lens, located behind your pupil. The lens contains protein that degenerates with age. When you are about 45 years-old, this change in the lens protein makes the natural lens firmer and that's why reading glasses are needed at that time. Later, the lens protein begins to change color which makes the lens cloudy. The result is a cataract and blurred vision.