Lasik or Laser in situ Keratomileusis reshapes the cornea by using a Laser beam, thereby altering its curvature. It corrects vision by altering refractive power of the eye by calculated change in the curvature of the cornea. The image of the outside world in now focused sharply on the retina.
The procedure is relatively simple and comfortable. Eyes of the patient are made numb by instilling anesthetic eye drops. Using an instrument called microkeratome a thin flap of corneal tissue is raised. Excimer Laser then reshapes the cornea by removing a predetermined precise amount of tissue from inner cornea; the corneal flap is then repositioned back where it bonds without the need of stitiches.
Cardiac Treatment Facilities :-
To treat myopia (nearsightedness) the cornea must be made flatter to reduce converging power of the eye. This is achieved by removing more tissue from the center than around.
To treat hypermetropia (farsightedness) the central cornea must be made steeper thereby enhancing the converging power of the eye. This is achieved by removing more tissue from the periphery than the center.
To treat astigmatism, the cornea must be made more spherical (uniformly curved). By changing the pattern of the beam tissue is removed in one direction more than the other.