Noun
hyperopia- A disorder of the vision where the eye focusses images behind the retina instead of on it, so that distant objects can be seen better than near objects.
Read full definition at wiktionary.org
...Hyperopia, also known as farsightedness, longsightedness or hypermetropia, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or when the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred.
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- 1.Hyperopia - Wikipedia, the free encyclopedia
- Hyperopia, also known as farsightedness, longsightedness or hypermetropia, is a ... People with hyperopia can experience blurred vision, asthenopia, accommodative ...
- http://en.wikipedia.org/wiki/H
yperopia
- 2.Hyperopia (Farsightedness) - AllAboutVision.com
- ... causes, symptoms and treatment of hyperopia (farsightedness) including eyeglasses, contact lenses and ... Hyperopia, or farsightedness, is a common vision ...
- http://www.allaboutvision.com/
conditions/hyperopia.htm
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What is the difference between What is the difference between
Myopia, Hyperopia and
Emmertopia?
Thank you.
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Myopia - Nearby objects are clear but far away objects are blurry. Either the eyeball has grown too long or the cornea is too steep. Hyperopia - Caused by an eye 'imperfection', usually if the lens is not round enough or if the eyeball is too short. Close up objects appear blurred. Emmetropia - A refractive condition where the vision is basically 'perfect' because the parallel rays focus correctly and accurately on the retina. Hope that helped! :] |
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Is there a cure for myopia and From my understanding, myopia
and hyperopia (as well as
certain forms of astigmatism)
are caused by an irregular
shape of the eyeball. If this
is so, have scientists found a
way to reshape the eyeball and
cure these conditions? Are
there other implications that
conditions like myopia and
hyperopia cause that make this
difficult? What relevant
research is being done today?
I developed myopia and a very
young age and had it get
increasingly worse, up until
the point where I can not see
anything more then a few
inches away clearly without
glasses. I've always been
curious about this. I don't
mind wearing contacts or
glasses all the time, but it
would be nice if there was a
way to actually cure this!
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A person developing a refractive error (myopia/hyperopia/astigmatism) is mainly due to their genetics. However, it is still not fully understood what causes people genetically susceptible to refractive errors to develop them while others do not. That is where the environmental factors apparently come into play. This issue is very complex and as of now there is no concrete evidence to actually prove any theory 100 percent. The only thing that has been proven is that genes are involved in developing refractive error and many other factors are involved! Scientists believe that people who develop refractive error because they are genetically susceptibility also combined with tissue alterations influenced by environmental factors. Since the development of refractive errors is still not fully understood, at this time there still is no "cure". You cannot cure something that is not fully understood. Laser eye treatments can be preformed to correct vision and obviously contact lenses and glasses can be worn to correct vision, but at this time there is no actual cure or way to prevent refractive errors. Most of the research that I have seen done involves myopia and focuses mainly on what causes a person to develop it. Here is some information I have dug up from some myopia studies if you are interested: "A study of 506 pairs of twins (both identical and non-identical) confirmed an earlier study by the same group that genes are by far the most important factor with a heritability of 89% - environmental factors only accounted for 11%. " Research is still not conclusive on this matter so as it stands nearsightedness is predominately genetic, since even small deviations from normal structure cause significant refractive errors, it may be difficult to single out any specific genetic or environmental factor as their cause. "Only 6%-15% of children with myopia come from families in which neither parent is myopic. In families with one myopic parent, 23%-40% of the children develop myopia. If both parents are myopic, the rate rises to 33%-60% for their children. One American study found that children with two myopic parents are 6.42 times as likely to develop myopia themselves as children with only one or no myopic parents. The precise interplay of genetic and environmental factors in these family patterns, however, is not yet known." Anyways check out the links for more info :) Hope this helps a bit :) |
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what is the difference between what is the difference between
hyperopia and presbyopia?
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The eyeball of a farsighted person is shorter than normal. Many children are born with hyperopia, and some of them "outgrow" it as the eyeball lengthens with normal growth. Sometimes people confuse hyperopia with presbyopia, which also is a difficulty in seeing up close, but has a different cause. When people develop presbyopia, they find they need to hold books, magazines, newspapers, menus and other reading materials at arm's length in order to focus properly. When they perform near work, such as embroidery or handwriting, they may have headaches or eyestrain, or feel fatigued. Presbyopia is caused by an age-related process. This is different from farsightedness, which is related to the shape of the eyeball and caused by genetic factors, disease, or trauma. Presbyopia is generally believed to stem from a gradual loss of flexibility in the natural lens inside your eye. Did I confuse you more? I hope not! I hope this helps! O^O |
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