The main symptoms of cataracts include blurred or clouded vision, difficulty seeing at night or in dim light and double vision in a single eye. Cataract surgery is an option if cataracts begin to affect a person's ability to carry out daily functions.
Additional symptoms of cataracts are frequent changes in a person's eyeglass prescription, sensitivity to light and seeing halos around lights, according to Mayo Clinic. Cataracts cause blurry vision because they scatter the light as it passes through the lens of the eye, preventing a clear image from reaching the retina.
Cataracts form in the lens of the eye, which is located behind the iris of the eye. They are caused by changes to the tissue in the lens of the eye, usually by age or injury. While cataracts can sometimes develop in only one eye, they are usually present in both eyes.
Sometimes a person can be born with cataracts, or they can develop them in early childhood. This is called congenital cataracts and may be the result of the child's mother having Rubella or Lowe's Syndrome during pregnancy. Other types of cataracts include nuclear cataracts, which affect the center of the lens and cause problems with distinguishing between shades of colors, and cortical cataracts, which affect the edges of the lens and cause problems with glare.