Glaucoma is a group of eye diseases that results in a gradual loss of vision, and occurs without warning or symptoms. It is the second leading cause of blindness in the United States in people over 40 years old (macular degeneration is the first). Unfortunately, up to 50% of people who have glaucoma do not know that they have the eye disease.

The eye is one of the five sensory organs of the body. The 'window' is the cornea . All light enters the eye through this window. The cornea receives the light and bends it into the pupil. The pupil is the large black circle part of the eye. If the cornea is the window, the pupil is the window shade. Sophisticated tissue that adjusts the light by expanding and contracting, regulating the amount of light entering the eye. Pupils have their own built-in intelligence. In bright light, the pupil can constrict to the size smaller than a head of a pin. In darkness, the pupil will grow almost to the size of a dime. Next time you make your way across a dark room without running into a wall. It's because your pupils are doing their job.