3. Uses Of Contact Lens
. purpose
Optical Therapeutic Cosmetic
Enhance
performance
Color filterSpherical Keratoconus
Drug delivery
Orthokeratology
Bandage
Presbyopic
Toric
4. Special Type Of CL
• Daily-wear lenses are the least expensive, are removed nightly and
are replaced on an individualized schedule. They should not be
used as an extended-wear lens.
• Extended-wear lenses are worn overnight but are removed at least
weekly for thorough cleaning and disinfection. They are being
recommended less frequently, since there is a greater risk of
corneal infection with any overnight wear of contact lenses.
• Disposable-wear lenses are more expensive, but convenient. They
are removed nightly and replaced on a daily, weekly, biweekly, or
monthly basis. Disposable lenses are sometimes recommended for
people with allergies and for those who tend to form deposits on
their lenses
5. Cont………….
• Colored contact lenses are contacts that change your eye color, the
appearance of your eye, or both. And in the case of circle lenses they can
also make your iris appear bigger. Colored lenses are available by
prescription and should only be worn after an eye exam and fitting by a
qualified eye care professional. Over-the-counter colored contacts,
including circle lenses, are illegal and pose a serious danger to your eye
health. They can cause eye injury, eye infection, and vision loss.
• Toric soft contact lenses can correct astigmatism, but sometimes not as
well as RGP lenses do. They usually cost more than other contact lenses.
• Bifocal or multifocal contact lenses are available in both soft and RPG
varieties. They can correct nearsightedness, farsightedness and
astigmatism in combination with presbyopia. Cleaning and disinfection are
specific to the lens material. Visual quality is often not as good as with
single vision lenses; however, for some people the ability to correct
presbyopia is worth it.
