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These Prism Eye Glasses or Bed Prism Spectacles allows you to read in bed or watch TV while lying flat on your back. Designed originally for those with limited mobility by turning the wearer’s view to a downward 90 degree angle, thus eliminating the need for head movement. So as it turns out they are great for preventing neck cramps or eye strain now you’ll never need to sit up in bed to read your book ever again!