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When light doesnt enter the eye correctly because of a refractive error in the cornea (basically your cornea lens is out of whack and mis-shaped) you will see double because you are seeing one thing in one place with one eye and another thing in another place with the other eye. A prism in your glasses pulls the image in the bad eye back into place fusing the images and relaxing your eye. Some people dont exactly see double but get headaches because their eyes are being strained, a prism will usually do the trick.

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16y ago

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