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Myopia and Hyperopia: What Are They and Where Do They Come From?
What are myopia and hyperopia? These are conditions caused by visual defects in the eye, also known as refractive errors. Both myopia and hyperopia will cause vision to be distorted and may also occur in combination with a third refractive error in the eye called astigmatism. All refractive errors in the eye are caused by the shape, size, or slope of the eye or the cornea.
Myopia is also called shortsightedness, and hyperopia is also called farsightedness. With shortsightedness, which is the most common problem where refractive errors are involved and affects the greatest number of people, objects that are close are clear, but when the objects are at a distance they blur and become hazy and hard to distinguish clearly. This is caused by the eye being longer than normal or the cornea is placed too steeply so that things seen do not fall into the retina but rather in front of it.
Myopia and hyperopia can usually be corrected with glasses, contacts, or Lasik eye surgery. Hyperopic patients can see objects that are far away, but can not clearly see objects that are right in front of them or close up.
Hyperopia is caused by the exact opposite problems of myopia, and the eye is shorter than it should be or the cornea is not curved enough and is flatter than usual. Hyperopic patients may not even realize that they have this condition until after they are in their 20s or 30s because often the lens of the eye can correct the error early on, but as people age the lens of the eye loses the ability to do this and then the error becomes apparent because the vision starts to blur increasingly.
The information supplied in this article is not to be considered as medical advice and is for educational purposes only.
|Myopia and Hyperopia5 Nov 2009|