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Nearsightedness can be determined by eye exam, PMF Advanced Proof Review measuring in diopters by the strength, and the prescription is a negative number, the higher the number is the worse the eye's condition is. Nearsightedness is divided into three levels by the number, low myopia (0.00 to -3.00 diopters), medium myopia (-3.00 to -6.00 diopters) and high myopia (-6.00 to -10.00 diopters). Nearsightedness can also be divided into simple myopia, degenerative myopia, nocturnal myopia, pseudomyopia and induced myopia by their clinical appearance. Fortunately, nearsighted eye can be corrected by eyeglasses or contact lenses simply. If glasses or contact lenses are not favorable, nearsighted people can choose refractive surgery, such as LASIK and PRK, in which a flap is cut through the top of the cornea by an excimer laser.The crystalline lens is the biconvex sphere located in the eye which bends light to focus images on the retina. However, a certain problem can occur caused by metabolic changes due to aging which leads to opacity of the lens or commonly called as cataract. With problems of this part of the eye, you can experience decreased ability to read due to lessened ability to accommodate and converge. Aside from that, you will encounter problems in viewing distant objects and in tolerating glare due to opacification and decreased elasticity.   https://usainfo.org/proven-methods-that-will-help-improve-vision-correct-your-eyesight/

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