金沙城中心游戏平台

金沙城中心游戏:Tinted view

作者:眭例辶    发布时间:2019-03-07 10:03:04    

By Robert Adler MANY children who are struggling to read could be helped by wearing coloured contact lenses. The finding supports a theory linking dyslexia and other reading problems to distorted visual perception. David Harris, a researcher at the Ultralase Clinic in Chester, was intrigued by patients who told him that tinted lenses prescribed to remedy poor colour vision also helped their reading. So he took 47 children and adults who had been diagnosed as dyslexic, and fitted them with different coloured lenses to find which colour made it easiest for them to read. All the volunteers were then given reading tests with and without these lenses, and with lightly tinted “placebo” lenses that they were told had been specially designed to help with reading. On average, they read 6 words per minute faster with the placebo lenses and about 12 words per minute faster with the most effective coloured lenses—an improvement of about 15 per cent (Journal of the American Optometric Association, vol 70, p 629). Harris thinks the treatment could best help those who experience visual distortions of print. “They see words moving, or patterns like snakes or rivers running through the text,” he says. One theory of how the lenses work, championed by John Stein of the University of Oxford, is that dyslexia is caused by defective nerve cells that form a pathway from the retina to the brain’s visual cortex (New Scientist, 24 April, p 27). These cells respond most strongly to yellow-orange light,

 

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