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Why must the slanted surface be at 22 degrees?

April 26, 2017degrees slanted

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Why must the slanted surface be at 22 degrees?

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A. Pioneering research by Dr. Darrel Boyd Harmon and subsequent research by Drs. John Pierce and Steven Greenspan clearly prove a reduction of stress and improved performance when conditions are arranged properly for near-point visual activities such as reading and writing. It has been determined through research and practical use that 22 degrees to be the optimum angle.