The Formation of Myopia
“Myopia also called nearsightedness or shortsightedness, is a refractive defect of the eye in which collimated light produces image focus in front of the retina when accommodation is relaxed. ” To know how the myopia forms can help us prevent and control the disease.
The nearsighted eye has no difficulty viewing nearby objects. But the ability to view distant objects requires that the light be refracted less. Myopia will result if the light from distant objects is refracted more than is necessary. The problem is most common as a youth, and is usually the result of a bulging cornea or an elongated eyeball. If the cornea bulges more than its customary curvature, then it tends to refract light more than usual. This tends to cause the images of distant objects to form at locations in front of the retina. If the eyeball is elongated in the horizontal direction, then the retina is placed at a further distance from the cornea-lens system. Subsequently, the images of distant objects form in front of the retina. On the retinal surface, where the light-detecting nerve cells are located, the image is not focused. These nerve cells thus detect a blurry image of distant objects. A major way about the reason of the formation of myopia is the combination of genetic and environmental factors. In one hand, to the genetic reason, myopia has high heritability. If your parents are high myopia, you may have risk to inherit the nearsightedness. In another hand, to the environmental factors, usually, we can find the direct connections between environmental reasons and myopia. People especially in teenage, in unhealthy lifestyles that don’t pay much attention to their eye hygiene, such as reading in dimmed situation and wrong position, lack of sleep. The eyes become strained by the constant extra work involved in “near-work” and get stuck in the near position.
The cure for the nearsighted eye is to equip it with a diverging lens. Since the nature of the problem of myopia is that the light is focused in front of the retina, a diverging lens will serve to diverge light before it reaches the eye. This light will then be converged by the cornea and lens to produce an image on the retina. It is very important to wear the right glasses. You can get it from the doctor, some professional titanium eyewear company, even from some glasses-selling webs. And it is also important to have a proper diet, do eye excises and keep enough sleep for people who are nearsighted. Eyes are the windows of our hearts. It will be no use putting glasses on them. I hope those information can help you!
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