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Contact Lenses - A Non-Surgical Alternative For Better Eyesight
In case the lenses of your own eyes fail to focus images on your retinas, you have the option of wearing glasses or contact lenses to see well. As you know, glasses, which are the safest solution to correct refractive errors, enhance eyesight by putting a lens in front of each eye. Eyeglasses for myopia refocus the light getting into your eye using a concave lens (it bows inward) that is thinner in the middle than around the edges. Simply put, such a minus lens - which subtracts power out of your optical system - "pre-spreads" the light, which causes the rays of light to diverge before they enter your cornea. A minus lens transfers the focus of an image from in front of the retina onto the photo receptors of the retina.
Glasses and even cheap contact lenses correct farsightedness by refocusing the light that enters your eye with a convex lens (it bows outward) that's thicker within the middle than around the sides. Such a plus lens - which adds power to your very own optical system - "pre-bends" the light rays, causing the rays to converge more rapidly before they enter your cornea. A plus lens brings the focal point from behind the retina forward onto its photoreceptors.
Contact Lenses
Contact lenses may correct eyesight by refocusing light through a transparent, hard or perhaps soft hydrophilic disk (one with a high water content) that floats on the surface of your eye.
Like glasses, discount contact lenses for near- and farsightedness move the focus of light, placing pictures directly on each retina. Hard gas-permeable lenses (RGPs), often provide clearer, crisper vision than soft contact lenses (SCLs). By creating a spherical refracting surface, hard lenses would correct not just near- and farsightedness, but also astigmatism. Some people however, are unable to tolerate rigid lenses.
Most patients find SCLs more comfortable compared with RGPs, however SCLs - which mold to the surface of the eye - often fail to fix astigmatism. Even if specially-designed "toric" soft lenses rectify astigmatism, not everyone can wear them.
Allowing increased oxygen transmissibility, extended-wear soft contact lenses offer improved comfort and can be made to fix astigmatism. Disposable soft contacts, which most people cannot feel in their eyes, are very convenient because you can throw them away at the end of the day.
Regrettably, they fail to fix significant astigmatism. Interestingly enough, sometimes even a soft lens without toric correction could mask as much as 1 diopter of astigmatism, depending on the contact's ability to hold its shape. Some soft lenses are thicker than others. If a patient can put on a soft contact that has enough body. or "memory," even a spherical lens with no toric correction could offset low amounts of astigmatism.
Contact Lenses - A Non-Surgical Alternative For Better Eyesight
Contact lenses can correct eyesight by refocusing light through a clear, hard-milled or soft hydrophilic disk (one with a high water content) that floats on the surface of your eye.
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