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Contact Lenses - A Non-Surgical Solution For Better Eyesight
If the lenses of your eyes fail to focus images on your retinas, you've got 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 every eye. Glasses for myopia refocus the light entering your eye with a concave lens (it bows inward) that is thinner in the center 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 go into your cornea. A minus lens shifts the focal point of an image from in front of the retina onto the photo receptors of the retina.
Eyeglasses 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 center than around the sides. Such a plus lens - which adds power to your optical system - "pre-bends" the light, causing the rays to converge more speedily 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 rectify eyesight by refocusing light through a transparent, hard or soft hydrophilic disk (one with a high water content) that floats on the surface of your eye.
Similar to glasses, discount contact lenses for near- and farsightedness transfer the focus of light, putting pictures directly on each retina. Rigid gas-permeable lenses (RGPs), usually provide better, crisper vision than soft contact lenses (SCLs). By creating a spherical refracting surface, hard lenses would rectify not just near- and farsightedness, but also astigmatism. Many people however, are unable to tolerate hard lenses.
Most patients find SCLs more comfortable when compared to RGPs, however SCLs - which mold to the surface of the eye - usually fail to rectify astigmatism. Even though specially-designed "toric" soft lenses correct astigmatism, not everyone will be able to wear them.
Allowing increased oxygen transmissibility, extended-wear soft contact lenses offer improved comfort and may be made to rectify astigmatism. Disposable soft contacts, which many people cannot feel in their eyes, are particularly convenient because you can throw them away at the end of the day.
Regrettably, they fail to fix significant astigmatism. Interestingly enough, at times even a soft lens without toric correction can mask up to 1 diopter of astigmatism, depending on the contact's ability to hold its shape. Some soft lenses are thicker when compared to others. If a patient can put on a soft contact that has enough body. or "memory," even a sphere-shaped lens with no toric correction may offset low amounts of astigmatism.
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