摘 要: | A new study shows that large amounts of vitamins and minerals can slow the loss of sight linked to aging. The condition is called age related macular degeneration (衰退) or A-M-D. The disease is a major cause of blindness among old people. Doctors do not know what causes it. The disease destroys the central part of the retina(视网膜), the cells at the back of the eye that gather light. The first sign of A-M-D usually is a loss of visual clearness. People with the disease have trouble reading, driving and recognizing faces. They cannot see clearly through the center of their eyes. They must
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