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:
This condition is characterised by an irregularly shaped cornea, causing light images to focus on two separate points in the eye. The effect is similar to the distorted reflection in a fun-house mirror. Until fairly recently, people with astigmatism were limited to spectacles. But today’s "toric" contact lenses can be custom made and provide enhanced visual performance and comfort. Almost anyone with astigmatism can now wear contact lenses.