Cataracts occur naturally as the eyes age and a build up of protein causes a clouding of the eye’s lens. By age 65 more than 90% of all Americans either have a cataract or have had cataract surgery. Over time, the cataract may grow larger and cloud more of the lens, worsening vision. In addition, cataracts can result from exposure to toxic substances, diseases such as diabetes, or arise after an eye injury. A cataract can develop in one or both eyes and fortunately can be treated with a common and safe surgery.