Cataracts cause a clouding of the lens in the eye, making your vision appear to be foggy. Cataracts are the most common cause of vision loss in people over 40 and are the leading cause of blindness in the world.
Your eyes are meant to naturally adjust to normal light changes, adjust focus, and allow us to see both near and far. Your lens is primarily made up of water and proteins. The proper arrangement of these proteins is what contributes to normal vision. Some of these proteins clump together forming a clouding of the lens.