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Lasik & Refractive

What is LASIK?

LASIK involves putting the PRK treatment not on the surface of the cornea, but under a protective corneal flap. A very thin (about 0.16 mm) and precise flap is raised by a special instrument known as microkeratome. The result is a corneal flap attached at one edge, the hinge. The surgeon folds the flap to expose the inner stromal layer of the cornea. The excimer laser treatment is applied on this stromal bed to remodel it. After this the flap is repositioned to its original position and it does not require any suture. Since the corneal epithelium has only been minimally disturbed, there is only mild discomfort after the procedure.

Laser Assisted Stromal In-situ Keratomileusis [LASIK] is a method of re-shaping the external surface of the eye [the cornea] to correct low, moderate and high degrees of nearsightedness, astigmatism and far-sightedness. During the treatment, an instrument called the microkeratome creates a corneal flap to make it a painless procedure.

What are the complications of LASIK?

LASIK is a very safe procedure with a majority of patients achieving very good results. However, since it is a surgical procedure, it does carry some chances of complications as well, which would be discussed with you before the surgery. The overall rate of significant complications in LASIK is only of the order of 1-2%.

Some of these complications may be:

  • Undercorrection or Overcorrection
  • Glare and difficulty in night driving
  • Flap complications, perforation
  • Infection
  • Scarring of the cornea

What is Customised LASIK?

This is a special form of LASIK in which the treatment parameters are customised for the particular patient, based not only on the refractive error, but also on the corneal map of the eye and other findings detected by special tests. This procedure tries to correct aberrations, maintains normal shape of the cornea and gives better night vision.

Type of LASIK

Conventional Lasik
Lasik is a procedure to correct nearsightedness farsightedness and astigmatism. It utilizes the microkeratome to create a corneal "flap" of about one-third of the total corneal thickness. The excimer laser is then used to reshape the exposed middle layer of the cornea. The flap is finally put back to assume a new shape created by the excimer laser.

Bladefree Lasik
In Bladefree LASIK surgery, a laser called IntraLase is used to create the flap. The IntraLase is a bladefree LASIK surgery system that creates the corneal flap by forming a layer of bubbles beneath the outer layer of the cornea with the use of rapid pulses of light.

Bladefree is 100% safe. Bladefree LASIK definitely is safer for patients with thinner corneas who may not have been ideal candidates for LASIK with Blade.

What is Refractive Surgery?

For people who are nearsighted, certain refractive surgery techniques will reduce the curvature of a cornea that is too steep so that the eye's focusing power is lessened. Images that are focused in front of the retina, due to a longer eye or steep corneal curve, are pushed closer to or directly onto the retina following surgery.

Refractive surgery might be a good option if you:

  • Want to decrease your dependence on glasses or contact lenses
  • Are free of eye disease
  • Accept the inherent risks and potential side effects of the procedure
  • Understand that you could still need glasses or contacts after the procedure to achieve your best vision
  • Have an appropriate refractive error

Various types of refractive surgeries?

The refractive power of the eye can be changed by any of the three approaches:

Changing The Curvature Of The Cornea: This is the most popular mode of refractive surgery.

Removing The Natural Lens And Replacing It With An Artificial Lens Of Adequate Power: It is similar to a routine phacoemulsification surgery, except that it is done in a clear lens and not a lens with cataract. As it is an invasive procedure and it also increases the chances of retinal detachment in eyes with high myopia, it is not recommended nowadays.

Putting An Additional Artificial Lens Within The Eye On Top Of The Existing Natural Lens: This technique is still not very popular as it is also invasive and may increase the chances of cataract formation.

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