When the eye is relaxed and parallel light rays enter the eye, refraction occurs Round Tortoise Shell Glasses. If the focus does not converge into the fovea, refractive errors occur. Refractive errors are classified as nearsightedness, hyperopia and astigmatism. After pupil dilation, if the patient's visual acuity is still not restored to the normal 1.0, the patient has true myopia, and it is recommended to wear Tortoiseshell Glasses Frames to correct the visual acuity. For children if long time don't wear Light Tortoise Shell Glasses, corrected vision has not restored to normal levels, will give the patient's visual development brings the serious influence, serious still can form amblyopia, amblyopia patients for treatment of the golden age, before the age of 9 age after missed the visual development, even wearing Tortoiseshell Glasses, is also not correct to normal peers children's visual acuity level.
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