Some types of lenses increase your eyes' sensitivity to light.
What lifestyles do you lead? What kind of work do you do?
For those involved in sports and recreational activities, contact lenses offer a number of advantages, in addition to providing god peripheral vision, eliminating the problem of fogged or rain splattered lenses and freeing you from worries about broken glasses, contact lenses also mean you can wear wear non-prescription protective eye wear. Looking sideways through the lenses of glasses need lead to prismatic effects because you are not looking through their centers. Your eyes have to coordinate differently to cope with this. This does not happen with contact lenses because you always look through the centers of the lenses or they move with your eye movements.
Your occupation and work environment should also be taken into consideration. Those who work in an area that requires good peripheral vision may want to consider contacts. For those in industry environments or where chemicals are in heavy use are likely to find spectacles more comfortable.
Do you like the way glasses feel? Do you like how you look in them? No longer is it really necessary to choose between either contacts or glasses. Some of today's contacts are so easy to wear that you can use them intermittently--for special occasions, while participating in sports or to match your fashion.
New single-use, one-day disposable lenses are comfortable and do not require cleaning. They may be easily interchanged with glasses.
How contact Lenses Correct Vision
Contact lenses are designed to rest on the cornea, the clear outer surface of 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.
As the eyelid blinks, it glides over the surface of the contact lens and cause it to move slightly. This movement allows the tears to provide necessary lubrication to the corna and helps flush away debris between the cornea and the contact lens.
Contact lenses are optical medical devises, primarily used to correct nearsightedness, farsightedness, astigmatism and presbyopia. In these conditions, light is not focused properly on the retina, the layer of nerve endings in the back of the eye that converts light to electrochemical impulses. When light is not focused properly on the retina, the result is blurred or imperfect vision.
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 on the retina. The result is clear vision.
