By taking advantage of optics principles and employing the reflecting prisms that made of high-qualified optical materials, Horizontal Glasses allow users easily reading books, watching TV and doing other operations in a supine position.The special spectacles are as similar in shape as ordinary glasses. You can wear the prism glasses only or wear it over your ordinary glasses ,include prescription glasses. It is made up of a frame, fixing components and a refractive lens which turns straight-line lights into crooked-line lights. The refractive lens is settled in the view-finders of the frame; the fixings and the frame are fastened together.Our high definition prism glasses help you read a book without eye fatigue or physical strain.Turn your view to a downward 90 degree angle, eliminating the need for head movement. Are great for preventing neck cramps or eye strain.This ultimate glasses is suitable for ordinary people and person with medical problem. Used for home or travel use. Lying for Reading on the beach or at home. Not only read and watch conveniently & comfortably but also relax the body .Please check the size in the picture before purchasing.