WHAT IS LASIK (LASER ASSISTED IN-SITU KERATOMILEUSIS)?
LASIK is currently the best method of correction of refractive errors. It is accurate, effective and safe. In LASIK, a very thin (110 to 160 micron) layer of the cornea (the transparent part of the eye) is raised. Using computer controlled Wavelight Allegretto Excimer Laser, (Argon Fluoride 193nm) the cornea is then reshaped into a predetermined curvature. This leads to correction of myopia, hypermetropia, and astigmatism. The procedure is short, simple and being computer controlled is highly accurate. The steps are detailed below:
ARE YOU FIT FOR LASIK?
It is extremely important to determine who is a suitable candidate for LASIK surgery. The important criteria are:
- Refractive error: Myopia between -1 to -12 diopter or Hypermetropia up to 6 diopter
- Astigmatism of up to 6 diopters
- Minimum age 18 to 21 years
- Refraction should have been stable for last 1-2 years
- Presence of keratoconus, thin corneas, corneal inflammatory diseases, herpetic keratitis and autoimmune diseases makes a person unsuitable for LASIK
Preoperative Before the Preparation
- Refraction under cycloplegia
- Corneal topography
- Ultrasonic pachymetry (to measure thickness of cornea)
- Detailed retina examination
- Intraocular pressure examination
- Informed consent procedure
WHAT ARE THE PRECAUTIONS?
- Avoid swimming and splashing of water on the eyes for a month
- Avoid rubbing the eyes for a month
- Use sunglasses to avoid bright sun, dust, wind and air pollution
- Avoid excessive viewing of TV or work on computers for a week
- Use medicines regularly as advised
- Consult your eye surgeon in case of any problem
HOW MUCH TIME?
A typical schedule for LASIK patient is as follows:
- Day 1 - Detailed eye examination
- Day 2 - LASIK Surgery (2-4 hours spent in the centre)
- Day 3 - Review visit for postoperative examination
- Day 7 - Review examination
Patient may travel between days 3 and 7.
WHAT ARE THE RESULTS?
Results are generally very satisfactory and it has been reported that in carefully selected cases more than 90 % achieve unaided visual acuity of 6/12 or better (i.e., 6/12 6/9 6/6 6/5). There is a subjective difference in the degree of satisfaction among the patients. Some patients with a vision of 6/12 may feel very happy while others may be dissatisfied even with a vision of 6/5.
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