There are many factors that cause cataracts, the most common being age-related cataracts. As we age, we are exposed to ultraviolet rays which can cause degeneration of the lens. The older a person is, the more ultraviolet rays they absorb. Some cataracts are also caused by medications, such as long-term use of steroids. Additionally, some cataracts are caused by trauma; if the lens is accidentally punctured during an injury, it can rapidly deteriorate. There are also congenital cataracts caused by intrauterine infections. The causes are various, and in diabetic patients, their cataracts can progress more quickly because high blood sugar can lead to changes in the osmotic pressure of the lens.