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August 27, 2008
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Refractive Vision ProblemsEye ProblemsThe vast majority of vision problems result from imperfect formation of the eye's refractive system. In order to see clearly, there are a number of eye structures that must develop “just right” so that we have no need for vision correction. The cornea is responsible for 2/3 or the focusing power of the optical system of the eye while the lens takes care of the other 1/3.
Assuming all else is perfect, these two “lenses” should focus light down to a single point on the retina. Alternatively, an eyeball that is too long or too short will also result in improper focusing of light at the retina. As you can see, there are many ways that even the slightest imperfection in the development of an eye can result in a condition known as ametropia, where the eye's refractive system does not focus light at the proper place (ie. the retina). MyopiaMyopia (nearsightedness) is by far the most common vision problem, afflicting more than 1/3 of the American population. Nearsighted people have difficulty seeing far away objects clearly. Near vision is quite clear, however. Learn more about Myopia. HyperopiaHyperopia (farsightedness) is the second most common vision problem, affecting 1 in every 4 Americans. Farsighted individuals have to make their eyes work much harder to see near objects clearly while distance vision is clear. Learn more about Hyperopia. AstigmatismAstigmatism is a common vision problem where the cornea is irregularly shaped such that it is shaped more like a football than a spherical ball. Eyeglasses or toric contact lenses with different powers in two meridians are needed to correct for astigmatism. Learn more about Astigmatism. PresbyopiaPresbyopia is a normal process of aging; gradual loss of flexibility of the crystalline lens such that it loses its ability to accommodate and to produce clear vision of near objects. Learn more about Presbyopia. Treatment of Refractive Vision ProblemsContact LensesContact lenses provide clear vision to people who are nearsighted, farsighted, presbyopic, and astigmatic. No matter what your vision problem, chances are, you will be able to find contact lenses to correct it. Enjoy clear vision without having to wear bulky glasses that restrict your vision! Learn more about Contact Lenses. Laser Eye SurgeryTaking vision to the next level! Laser vision correction has been making giant leaps, and now offers wavefront Custom LASIK, an unprecedented opportunity for vision that you have never had before in your life! Laser surgery is an option for people with myopia, hyperopia, and astigmatism. Learn more about Laser Eye Surgery. EyeglassesThe mainstay of vision correction is eyeglasses. Over the years, eyeglasses have followed fashion trends and improved in quality, making them a perfectly acceptable complement or alternative to contact lenses and laser eye surgery. DisclaimerThe information provided by KnowYourEyes.com is intended for educational purposes only and in no way replaces the advice and diagnosis of a licensed eye care professional. KnowYourEyes.com disclaims any and all liability for injury or other damages that may result from use of the information obtained from this website. |
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