LASIK is a laser-assisted eye surgery that is used to correct the vision in case of myopia or asitmatism. An opthalmologist specialized in surgery performs the lasik surgery with a laser to correct the shape of the eye’s cornea for making the vision more accurate. This surgery is popularly known for providing the patients an alternative to wearing contact lenses or spectacles. Although it is a recent development in Opthalmology, LASIK has been performed on over 25 million people all over the world, of which 12 million are from U.S alone.
Procedure of Surgery:
The surgey procedure involves three steps.
Flap Creation – A soft suction ring is placed on the eye to hold it from rotating. This may lead some of the tiny blood vessels to burst onto the white part of the eye. However, this isn’t harmful and heals in a few weeks. The eye is temporarily dimmed due to the suction. Once the eye is immobilized, a flap is created. It is done by a mechanical procedure using a metal blade or a femtosecond laser that produces minite bubbles on the cornea which are close spaced. Now, the flap is folded backwards which can be uncomfortable. This process exposes the central portion of the cornea called the stroma.
Laser Remodelling – This step involves the reshaping of the stroma with the help of a 193nm laser device which vapourises the tissue carefully so that the adjascent parts to the target stroma are unaffected. No incision or burning of the tissue is involved. Hence, the pain experienced is also minimum. The eye recovery period after the surgery is very less as compared to the earlier painful procedure called Photorefractive Keratectomy. The excimer lased emloyed for the surgery can track the eye movements very dynamically (4000 times per second) which results in a very accurate incidence of the laser beam on the target area.
Flap Repositioning – Once the stroma area is treated, the flap is repositioned following high precision so that no debris or air bubbles remain beneath it. Till the eye is healed from the surgical process, the flap adheres naturally.
Care After Surgery:
Pateients are given eye-drops that are anti-inflammatory and anti-biotic, and they will have to use them for a few weeks. The operated eye is to be shieled from direct sunlight with the help of sun-glasses, which also help to prevent dryness and involuntary rubbing of the eyes. Generally, a contact-lens is placed on the eye for 5 to 7 days to acceletate the healing process. The patients are advised to follow all the necessaary precautions prescribed by their surgeon to avoid the risk of post-surgical complications.
Is It Effective?
The answer will be “yes”. The National Institute for Health and Clinical Excellence conducted research on LASIK and termed it to be effective. The patient satisfaction rate is found to be over 94% in many surveys. However, there are cases where LASIK is not no successful. The reasons are prolonged pain after surgery, over-correction or under-correction of the cornea which needs the patient to underge the surgery once again. But, the percentage of these cases is very low so that you need not take them into count.
From what I personally saw, a close friend of mine had undergone the LASIK surgery in Austin and his vision improved significantly after it. So, if you are planning to undergo it, consult your Opthalmologist about it and also reasearch more about it on the Web.