Lasik


LASIK (Laser-Assisted in Sltu Keratomileusis) is a type of refractive surgery for correcting Myopia, hyperopia and astigmatism. LASIK is performed by ophthalmologists using a laser.


LASIK is similar to other surgical corrective procedures such as Photo Refractive keratectomy (PRK)


Different types of LASIK

There are a variety of different types of lasers used in ophthalmology. All LASIK procedures are perfomed with a specific type of lasers (Excimer Laser).


Further, there are different types of laser ablations that can be performed, including Conventional Laser Treatments, Wavefront-Optimized Treatments, and Wavefront-Guided Treatments. Finally, a completely different type of laser (Femtosecond Laser) can be used instead of a mechanical Microkeratome to create the LASIK (corneal) flap.



Some real advantages of LASIK

Convenience of hassle-free eyesight. A means to open up career opportunities that wear once off-limits for those with restricted/limited visual acuity


  • Lasik is a life enhancing procedure. It improves nopt only your vision but your quality of life
  • Lasik procedure yields immediate results
  • The Lasik procedure restores peripheral vision, something that glasses cannot do.
  • The procedure is typically a permanent solution for visual disturbances

Procedure

In a perfect opical system ,the power of the cornea and lens are perfectly machched with length of the eye and images are in focus; any mismatch in this system is called a refractive error, and the result is a blurred image at some location.


During the LASIK procedure, a specially trained eye surgeon first creates a precise, thin hinged corneal flap using a microkeratome. The surgeon then pulls back the flap to expose the underlying corneal tissue, and then the excimer laser ablates (reshapes) the cornea in a unique pre-specified pattern for each patient. The flap is then gently repositioned onto the underlying cornea without sutures. There are several necessary preparations in the preoperative period. The operation itself involves creating a thin flap on the eye, folding it to enable remodeling of the tissue beneath with a laser. The flap is repositioned and the eye is left to heal in the postoperative period. Aiming to have a perfectly balanced optical system & thus clearer vision.

After effects of the surgery

High prescriptions :

Patients with extreme eyeglass prescriptions (high myopia or high hyperopia) may not be good candidates for LASIK because too much corneal tissue would need to be removed to safely perform the procedure.


Thin corneas :

Because all Excimer Laser Surgery (LASIK and surface ablation) requires the remove of small amounts of corneal tissue to correct your refractive error, the thickness of your corneas must be measured before surgery.


Abnormal corneal curvature :

There are many devices used today to measure the overall shape and curvature of your cornea. These devices are called Topographers and are an essential part of your initial evaluation. Abnormalities in the shape and curvature of your cornea may indicate that your cornea is weaker than that of the average person, and this will exclude you from having LASIK safely.


Dry eyes :

Patients with dry eye symptoms, such as burning, redness, and tearing may have worse symptoms after LASIK surgery. This occurs because corneal nerves are cut during this procedure, and these nerves are partly responsible for stimulating tear secretion.


Large pupils :

Although less common today, some patients still notice glare, halos, or other night vision issues after LASIK. Patients with large pupils may be more porn to noticing these things, so your screening evaluation should include measurement of your pupil size in a dark room.


Previous refractive surgery :

Prior corneal surgery or other types of refractive surgery, especially Radial Keratotomy (RK), may complicate additional procedures. You should talk to your eye doctor about this situation in order to make the best decision possible about your ability to be corrected with further surgery.