How contact lenses work
"Perfect vision" occurs when light rays converge at a point directly on the retina (on the back of eyeball). About four in ten people have "perfect" vision. For the rest, clear vision may be achieved by refocusing light rays using corrective lenses. Contact lenses are delicately crafted, very thin optical discs about the diameter of a shirt button. They are comfortably held in place by the eye’s own natural tears, which are always present between the lens and the eye.
The superior quality of today’s lenses, combined with professional fitting and aftercare, ensures your lenses will be properly prescribed for ultimate fit and comfort. Your eye care practitioner has many lens options to choose from in determining which one best suits your vision needs and your lifestyle.
Most common vision conditions can be treated with contact lenses, and in the last few years, technological advances have produced many more options for treating each kind of problem. Your eye care practitioner can tell you more about the range of options available for any of these conditions:
(Myopia) - People with this condition can see clearly up close but not at a distance. For those who are short-sighted a number of contact lens products are now available to restore sharp, clear distance vision. Your eye care practitioner will prescribe a concave or "minus" lens which will redirect the light rays so that they are properly focused on the retina.