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Are contact lenses right for me?
2014-06-24 15:50
Many people requiring vision correction can wear contact lenses without any problems or complications. New materials and lens care technologies have made today’s contact lenses more comfortable, safer and easier to wear. Consider the following to help assess whether they’re a choice you might consider.
 
How do contact lenses correct vision?
1. Contact lenses are designed to rest on the cornea, the clear outer surface of the eye. They are held in place mainly by adhering to the tear film that covers the front of the eye and, to a lesser extent, by pressure from the eyelids.
2. As the eyelid blinks, it glides over the surface of the contact lens and causes it to move slightly. This movement allows the tears to provide necessary lubrication to the cornea and helps flush away debris between the cornea and the contact lens.
3. Contact lenses are optical medical devices, primarily used to correct myopia, hyperopia, astigmatism and presbyopia. These conditions prevent an image from focusing properly on the retina, the thin layer of tissue that lines the inner posterior portion of the eye. It consists of fine cells called photoreceptors, or rods and cones. These cells transmit light from the eye to the brain where it is perceived as vision. When light is not focused properly on the retina, the result is blurred or imperfect vision.
4. When in place on the cornea, the contact lens functions as the initial optical element of the eye. The optics of the contact lens combine with the optics of the eye to properly focus light on the retina. The result is clear vision.
 
Myopia (nearsightedness) is not a disease, nor does it mean that you have “bad eyes.” It simply refers to a variation in the focus of your eyes. The degree of variation determines whether or not you will need corrective eyewear and how strong a correction you will need to see clearly.
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