Refraction faults and laser vision correction
About 120 million people in the United States wear glasses or contact lenses to correct imminent vision, distance or astigmatism. This article outlines breakthroughs that cause people to wear vision correction devices and decide to perform laser eye surgery.
Visual disorders, called refractive errors, occur when the corneal curve is incorrect (too steep or too flat) to the length of the eye. When the cornea has the correct shape and curvature, the light is tilted to the retina with accurate illumination. However, when the cornea curve is inappropriate, the light bends so it does not focus sharply on the retina and the images appear vague. Adjusting the correction lenses, eyeglasses or contacts before the cornea will light the lamp slowly to compensate for the refractive error of the cornea.
Affects myopia or short-sighted, 25 percent of all adult Americans. If the cornea is too bent or if the eye is too long, distant objects are blurred because they are in front of the retina.
Hypopia, or distance, is the opposite of myopia. Remote objects are clear, close objects are obscure. With hyperopia the images are centered on points beyond the retina. Hyperopia is a result of too short or too flat cornea.
Astigmatism is a condition in which the uneven curvature of the cornea is blurred and distorts both distant and near objects. The normal cornea is round, even curves side to side and top to bottom. With astigmatism, the cornea is more like a spoon's back, curved in more directions than in the other. This kind of curvature results in light beams having more focal points and focusing on two distinct areas of the retina, which distorts the visual image. Two thirds of myopia or hyperopia Americans also have astigmatism.
Presbyopia is often in contact with people when they enter the 40s, and this occurs when the lens lens is less elastic and the lenses that control the lens are weakened. People with presbyopia may have blurred vision in carrying out daily "close-up" tasks, such as reading, sewing, or working on a computer. That is why there are some who need presbyopia for reading glasses or keep the objects away to see them.
Corneal corneal curvature is different in all previous conditions. Eyeglasses and contact lenses are used to compensate for fractures caused by myopia, hyperopia and astigmatism. However, many people want to reduce their dependence on eyeglasses and their relationship. The reasons people find glasses or contact lenses.
There are a number of highly advanced surgical procedures that effectively reduce the need for eyeglasses or contact lenses. However, not everyone is the ideal candidate for these procedures. It is best to meet an experienced laser eye specialist in your area to see if you are a good candidate. For more information, read my other article, "Different LASIK Types".
- Published On : 1 year ago on May 1, 2018
- Author By : 346@dmin
- Last Updated : May 1, 2018 @ 11:50 am
- In The Categories Of : Uncategorized