PSC is an eye drop product used to control cataract. It contains Potassium Iodide, Sodium Chloride and Calcium Chloride. Potassium Iodide is used to improve the formation and health of blood vessels. Sodium chloride helps to draw water away from the cornea. Calcium chloride is included to control how blood moves into the eyes. The eye drop will slow down the development of cataracts, thus preserving the eyesight when it is used properly. It also improves how the eyes are able to attain the nutrients they need.