Page 34 - The Book Pi in eye

Rajesh Khanna, MD

10. Bifocals or progressives: take time and can cause trouble
getting used to
11. Can correct only in two axis
12. Some people consider glasses a visual crutch or handicap
13. Many people don't like wearing glasses for cosmetic
reasons
14. People forget where they put them

Contact Lenses:
Contact lenses have a cosmetic advantage over glasses. As they sit
closer to the eye than glasses they afford better field of vision than
glasses. Contact lenses have advanced from hard to rigid gas
permeable (RGP) to soft lens. Today daily disposable lens have
become fashionable, Toric soft lens help to correct astigmatism, and
color cosmetic lens are used to change the color of the eye.

The Disadvantages of Contact Lenses:
1. A contact lens is a foreign body in the eye and may cause
irritation, watering and redness.
2. Long term wear leads to dryness of eye, persistent redness
and irritation masquerading as allergy.
3. More prone to infections which can lead to loss of vision
and eye.
4. Contact lens may tear or fall out
5. With every blink the contact lenses move. In patients
wearing toric lens for astigmatism and those wearing
multifocal contact lenses blinking causes the lens to jump
confusing the brain.
6. With problems such as, Alzheimer's, Parkinson’s, tremors,
Rheumatoid Arthritis, contact lenses are difficult to handle
7. Handling contact lens may a pose a challenge in outdoor
activities such as camping, swimming, surfing, snorkeling,
or scuba diving
8. Decreases oxygen supply to cornea by interfering with the
tear film.
9. Long term damage to the inner lining of the cornea, which
maintains the clarity of cornea.
10. Allergic reactions to the contact lens solutions may
develop.

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