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PMF Advanced Proof

by Jerome Princy (2019-09-20)

What is going to be talked about in PMF Advanced Proof Review the following paragraph is the diagnosing method. As the author of this article has mentioned at the end of the former paragraph, a routine eye exam will tell whether you are nearsighted or not. In modern times, children have so many ways for entertaining, for example, TV and computer, so they are more inclined to have myopia in their childhood, therefore, parents should ask their children to form good habits to watch TV and computer screen and to read. Of course there inevitably exist cases that many children are born nearsighted or farsighted. If they want to correct their vision, they could choose to have eye surgeries when they grow up. Unlike nearsightedness and farsightedness, astigmatism is an eyesight problem which will cause blur vision both near and far, but like nearsightedness and farsightedness, it is caused by an irregular shape of the cornea. The normal cornea is thought to be spherical while the abnormal shape of astigmatism is a oval one. When the light shines into eyes, it will scatter rather than focus to a single point. As a result, blur vision both near and far is produced. It is featured with the blurring of lines. Usually, eyestrain and headaches are common complications. It is reported that astigmatism is mostly presented at birth, however, bad reading habits also could constitute to astigmatism. People who would like to spend a lot of time in reading or working before the computer are more likely to suffer from astigmatism. In normal circumstances, a routine eye exam could tell one whether he/she has astigmatism or not. In the exam, the eye doctor will apply some standard eye charts to check the patients' refraction and visual acuity. The two inspection items respectively refer to the ability to properly focus light rays on the retina and the acuity for eyes to view objects. Ways to check the two items vary. Some doctors would ask a series of questions while some others would apply a keratoscope or keratometer to measure the curvature and the shape of the cornea. If the astigmatism is not server, no corrective treatment is needed, but if it affects daily life, relative measurements should be applied. One is to wear corrective lenses, which is considered to be a conservative method of dealing with astigmatism. Glasses and contacts both are workable. Ortho-K is a kind of new contact lenses, which are able to gradually completely correct vision, and the patients only need to wear them at night. That is to say, as one wear Ortho-K at night day by day, they would recover from astigmatism gradually. Ortho-K achieves it by reshaping the cornea by applying pressure in the right way.