What Is Nearsightedness

Nearsightedness or nearsighted eye is also called myopia

. Nearsightedness is self-explanatory in its definition. It is a refractive defect of the eye in which in which nearsighted people can see nearby object clearly but have difficulty in reading and seeing objects at a distance. We know the human beings eyes have the ability of focusing images of both nearby and distant objects, because the lens of the eyes can assume a large curvature to focus nearby objects and a flatter shape to bring a distant object into focus. When the eyes are not able to provide a long focal length they cant focus on distant objects, so nearsightedness occurred. Nearsighted problem is very common in youth. It is said that 1/3 of the population is nearsighted. Bad behaviors such as sitting close to the television while watching TV, holding books very near to the face, reading in sun or in a bus can lead to nearsightedness. Some evidence suggests that if one or both parents are nearsighted, their children are more likely to be nearsighted.

Nearsightedness can be determined by eye exam, measuring in diopters by the strength, and the prescription is a negative number, the higher the number is the worse the eyes 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.

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