When the lenses of your very own eyes fail to focus images in your retinas, you have the choice of wearing glasses or contact lenses to see well. As you know, glasses, which are the safest method to correct refractive errors, improve eyesight by putting a lens in front of every eye. Glasses for myopia refocus the light getting into your eye by using a concave lens (it bows inward) that's thinner in the middle than around the sides. Simply put, such a minus lens - which subtracts power from your optical system - "pre-spreads" the light, causing the rays of light to diverge before they go into your cornea. A minus lens shifts the focus of a picture from in front of the retina onto the image receptors of the retina.

Glasses and even cheap contact lenses rectify farsightedness by refocusing the light that enters your eye with a convex lens (it bows outward) that is thicker in the center than around the sides. Such a plus lens - which adds power to your own optical system - "pre-bends" the rays of light, which causes the rays to converge more rapidly before they go into your cornea. A plus lens brings the focal point from behind your retina forward onto its photoreceptors.

Contact Lenses

Contact lenses can rectify eyesight by refocusing light through a transparent, hard or maybe soft hydrophilic disk (one with a high water content) which floats on the surface of the eye.

Like eyeglasses, discount contact lenses for near- and farsightedness shift the focal point of light, putting pictures directly on each retina. Hard gas-permeable lenses (RGPs), normally offer clearer, crisper vision when compared to soft contact lenses (SCLs). By creating a spherical refracting surface, rigid lenses can rectify not just near- and farsightedness, but also astigmatism. Many individuals though, are not able to tolerate rigid lenses.

A lot of patients find SCLs more comfortable than RGPs, but SCLs - which mold to the surface of the eye - usually fail to rectify astigmatism. Although specially-designed "toric" soft lenses fix astigmatism, not everybody can wear them.

Permitting increased oxygen transmissibility, extended-wear soft contact lenses provide increased comfort and may be made to rectify astigmatism. Disposable soft contacts, which lots of people can't really feel in their eyes, are very convenient since you can throw them away at the end of the day.

Sadly, they fail to correct significant astigmatism. Interestingly enough, occasionally even a soft lens without toric correction can mask as much as one diopter of astigmatism, depending on the contact's potential to hold its shape. Some soft lenses are thicker than others. In case a patient can wear a soft contact that has sufficient body. or "memory," even a sphere-shaped lens with no toric correction might offset low amounts of astigmatism.

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