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Ophthalmologists are physicians who specialize in the care of eyes and in the prevention and treatment of eye disease and injury. They test patients' vision and prescribe glasses or contact lenses. Most ophthalmologists also perform eye surgery, treating problems such as cataracts (which cloud vision) and other visual impairments. Because problems with vision may signal larger health problems, ophthalmologists may work with other physicians to help patients deal with diseases such as diabetes or multiple sclerosis.