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What is Glaucoma? Glaucoma is the number one cause of irreversible blindness worldwide affecting an estimated 70 million people. Glaucoma is a term that refers to a number of conditions that cause cell death in the optic nerve, resulting in irreparable and permanent loss of vision. Known as the 'silent' or 'sneak' thief of sight, it is particularly dangerous since in most cases there are few if any symptoms until a significant proportion of eyesight has already been lost. This book has been written specifically as a guide for glaucoma patients.