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Michael G. "Mike" May (born 1954) is an American business executive, skier and enthusiast of other sports who was blinded by a chemical explosion at the age of three, but regained partial vision in 2000, at the age of 46, after cornea transplants and a pioneering stem cell procedure by San Francisco ophthalmologist, Daniel Goodman. In 1999, May founded the Sendero Group in Davis, California, United States (US), which employs many individuals who are blind or visually impaired. Sendero has assisted those with sight disabilities by producing the first accessible GPS solution for blind persons. The Sendero Group's GPS technology received the Consumer Electronics Show's "Innovation Honoree" title in 2004 and 2009. Among his many accomplishments, May holds the record for downhill skiing by a person who is completely blind (racing at 65 mph). He competed in the alpine skiing event at the 1984 Winter Paralympics and won three bronze medals in the downhill, giant slalom, and combination events. May and his ex-wife, Jennifer, have two sons, Carson and Wyndham. ==Recovery from blindness== In 2003, three years after May's eye operation, the results were mixed. In terms of challenges, May reported being unable to grasp three-dimensional vision and to recognize members of his family by their faces alone. The effect of visual loss affects the development of the visual cortex of the brain—the visual impairment causes the occipital lobe to lose its sensitivity in perceiving spatial processing. Sui and Morley (2008) proposed that following seven days of visual deprivation, a potential decrease in vision may occur. They also found an increasing degree of visual impairment following thirty-day and 120-day periods of deprivation. The Sui and Morley study suggests that the function of the brain is dependent upon visual input. May lost his eyesight at the age of three when his vision was not fully developed; he was not yet able to distinguish shapes, drawings, or images clearly. Consequently, it was anticipated that he would experience difficulty describing the outside world in comparison to a normal-sighted person. For example, it would be difficult for May to differentiate between complex shapes, dimensions, and the orientation of objects. Hannan (2006) hypothesized that the temporal visual cortex uses prior memory and experiences to make sense of shapes, colors, and forms. Hannan proposed that the long-term effect of blindness in the visual cortex is an inability to recognize spatial cues. At three years of age, May's vision had still not reached the acuity of an adult person; as a consequence, his brain was still not completely exposed to the full extent of clarity in relation to the images and light of the environment. Such impairment led to difficulties with regards to normal daily life. Cohen et al. (1997) suggested that early blindness causes the poor development of the visual cortex, with a resulting decrease in somatosensory development. Cohen's study proposed that May's long term blindness affects his ability to distinguish between faces of males and females, and to recognize pictures and images. In spite of the surgery on May's right eye, his newly regained vision is not fully recovered after forty years of blindness. Thinus-Blanc and Gaunet (1997) suggest that people who are blind early in life show a limited ability in the area of spatial representation. The impairment of May's visual cortex, due to the loss of his vision at a very early age, resulted in visual cortex cells that are not accustomed to the stimuli in his surroundings. However, Cohen et al. (1997) have proposed that, during their early years, blinded subjects develop a strong inclination for tactile discrimination tasks. Similarly, May has developed very precise senses of hearing and touch. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mike May (skier)」の詳細全文を読む スポンサード リンク
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