The Science of Contact Lenses

 

Contact Lenses pic

Contact Lenses
Image: sciencedaily.com

Robert Deck serves as an optometrist in the office of Todd Harris and Associates in Lapeer, Michigan. Robert Deck draws on more than 20 years of experience in caring for Michigan patients and is experienced in working with patients who wear contact lenses.

At the most basic level, contact lenses function largely like tiny eye glasses. They help to refract light entering an eye that, due to structural abnormalities, does not focus light in a way that supports clear vision.

For patients with nearsightedness, uncorrected vision means that light entering the eye focuses to a point before it reaches the retina. Contact lenses for this condition effectively reduce the angle of focus, so that the focus point shifts backward to the retina. Lenses for patients with farsightedness, by contrast, increase the focusing power of the eye so that light does not hit the retina before it has had a chance to converge.

Because a contact lens rests on the cornea, it can perform this function without nearly the surface area of a typical eyeglass lens. The optic zone, which provides vision correction, only needs to be as large as the pupil, while the rest of the lens allows for fit to the eyeball. A pair of glasses must have a significantly larger optic zone, as the refracted light must travel much farther to reach the eye, just as a window must be larger than a peephole to view the street from across a room.

Contact lenses can be used to correct nearsightedness, farsightedness, individuals with astigmatism and even people who wear bifocals. Dr. Robert Deck, of Michigan, also uses contact lenses in the treatment of ocular disease and trauma. Cometic contact lenses that can change eye color are also available.

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