Word: retinas
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...sensory disability. Wharton is partially deaf and wears a hearing aid when on dry land. Darnyi has had only partial sight in his left eye since 1983. "We were fooling around in the snow when a snowball hit me in the eye," explains the swimmer. "It caused a detached retina." Despite four eye operations, and against the advice of his doctors, Darnyi , returned to competition in 1984. Between his typical eleven-mile-a-day training sessions, Darnyi, a science-fiction fan, builds model spaceships and muses on his future. The big question: Should he accept one of the many offers...
...lens of the eye becomes cloudy or opaque. About 15% of people over 65 suffer reduced vision from cataracts; many eventually undergo surgery to have the lens replaced. Some ophthalmologists also believe that decades of absorbing ultraviolet-A may lead to destruction of cells in the center of the retina. The condition, known as macular degeneration, is a leading cause of blindness in the elderly. Unlike cataracts, it is not correctable. While acknowledging that the evidence linking sunlight to cataracts and retinal damage is not conclusive, many doctors now recommend that adults, and children too, use sunglasses that absorb nearly...
Dowling said his own work focuses on vision and the retina, which he termed "the approachable part of the brain...
...overall flavor sensation). The loss of taste can lead to lack of appetite and sometimes to serious nutritional deficiencies. Hearing fades, particularly in the high-frequency range, and processing of information slows. Vision begins deteriorating at about 40. The pupil shrinks, reducing the amount of light reaching the retina. An 80-year- old's retina receives only about a sixth of the light that a 20-year-old's does. The lens hardens and clouds. More than half of those 60 and older have some cataract formation...
Leaders kept vanishing, leaving behind them a kind of iridescent afterimage upon the retina, and a sense of wonder...