Eating Healthy for Life

When the lenses of your 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. Spectacles for myopia refocus the light entering your eye 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 moves the focal point of an image 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 edges. Such a plus lens - which adds power to your own optical system - "pre-bends" the light rays, which causes the rays to converge more rapidly before they reach 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 clear, hard or maybe soft hydrophilic disk (one with a high water content) that floats on the surface of the eye.

Like spectacles, discount contact lenses for near- and farsightedness shift the focal point of light, putting images directly on each retina. Rigid gas-permeable lenses (RGPs), often offer clearer, crisper vision compared with soft contact lenses (SCLs). By creating a spherical refracting surface, rigid lenses can rectify not only near- and farsightedness, but also astigmatism. Lots of people however, are not able to tolerate rigid lenses.

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

Permitting increased oxygen transmissibility, extended-wear soft contact lenses provide increased comfort and may be made to correct astigmatism. Disposable soft contacts, which a lot of people cannot 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 will mask up to 1 diopter of astigmatism, depending on the contact's potential to hold its shape. Some soft lenses are thicker than others. When a patient can wear a soft contact that has sufficient body. or "memory," even a sphere-shaped lens without toric correction might offset low amounts of astigmatism.

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