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More than 40 million people worldwide are blind, and more than 120 million people struggle with disabling low vision. Advances in research have produced many new treatments and technologies to aid the blind and vision impaired. The Encyclopedia of Blindness and Vision Impairment, Second Edition provides the most comprehensive A-to-Z source of information available about blindness. More than 500 detailed entries, many new and updated, cover all aspects of vision impairment and related topics, including health and social issues, surgery and medications, adaptive aids education, and helpful organizations. Topics include Aging and vision impairment Attitudes towards the blind Braille music Corneal transplant surgery Education and the visually impaired Keratotomy LASIK surgery Muscular disease National Federation of the Blind Nondiscrimination laws Ocular trauma Vitamin deficiency and vision.