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Suitable for both youth and adults Looks like sunglasses, coating surface reduces light reflection Reduce eyestrain You can wear it indoors and outdoors when reading books, using computer or watching TV Helps to rectify visual problems caused by ammetropia and accommodation, like myopia, astigmatism and hyperopia Eliminates the strain, tense and twitch of eye accommodation system to prevent myopia Size: max. 14 cm in width http://www.1powershop.com/en/others/eyes-exercise-black-pinhole-glasses-vision-eyesight-improve.html Save $2 Coupon code: 1powershop