LASIK (Laser assisted in-situ keratomileusis) is a surgical procedure that can benefit patients with nearsightedness, farsightedness, and astigmatism by reducing dependence on eyeglasses and contact lenses. LASIK is performed with an excimer laser, which uses a cool ultraviolet laser beam to precisely remove ("ablate") very tiny bits of tissue from the surface of the cornea (the transparent part of the eye in front) in order to reshape it.
Nearsightedness or myopia refers to the condition when you can see near objects clearly but distant objects are blurred without glasses. Minus powered glasses or contact lenses are used to correct myopia.
Hypermetropia or farsightedness refers to the condition where you require plus powered glasses or contact lenses to see distant and near objects clearly.
The best candidate for LASIK is an individual above 18 years who desires to be less dependent on glasses or contact lenses and whose power of glasses has not changed for minimum 6 months.
During LASIK the eye surgeon uses a mechanized blade called microkeratome to create a thin surface flap of the cornea. This exposes the underlying tissues (stromal bed) to which the surgeon applies the Excimer laser beam to reshape the cornea changing its power. Once the laser ablation is completed, the surgeon gently replaces the corneal surface flap.+ Go to Top
Before the procedure, a few tests are conducted to evaluate for the patient's fitness for Laser procedure. These may involve 1-2 visits to the LASIK centre over 2-3 days. The evaluation process may take a couple of hours and also involve dilatation of eyes with eye drops. Dilatation of eyes result in inability to focus for near objects and increased sensitivity to light which last for 3-4 hours. Also:+ Go to Top
The LASIK procedure last only 20 - 30 minutes and the laser delivery itself takes less than a minute. You can return to home an hour after the surgery and return to work after one to three days.
The procedure is typically performed under topical (eye drop) anesthesia. During the surgery you will asked to lie down on the operating table and focus on a light above. The corneal flap is made and the Laser is done. The same procedure is then repeated in the second eye.
The vision is expected to be blurry immediately after your LASIK surgery. It improves significantly next morning and continues to improve over the next few weeks.+ Go to Top
The postoperative schedule of visits are at 1 day, 1 week , 1 month, 3 months, 6 months and
"Its a key question in anybody's mind who wants to undergo LASIK. It is a relatively safe procedure with very low chances of complications. LASIK been around for around 20 years and millions of people have undergone this procedure with good results. The procedure has been proven to be safe, if performed by an experienced surgeon.
The patients need to be carefully screened before surgery to exclude patients who have more than normal chances of developing complications. Most of the complications are minor and include over or under correction, temporary development of red spots over the eye, transient dry eyes, decreased contrast sensitivity and glare. Serious complications like infections which can cause serious loss of vision are extremely rare in good LASIK centers where the procedures are performed in a proper operation theatre like environment."
This is a new innovation in LASIK surgery which allows the procedure to be customized to each particular patient. While routine LASIK corrects the refractive error in the form of spherical and cylindrical power, wavefront LASIK also attempts to correct finer irregularities in the eye which may also contribute to poor vision but may not be amenable to correction by spectacles only. Correction of these finer irregularities means that the quality of vision might be better than routine LASIK with reduced symptoms of glare, haloes, ghost images and improved contrast sensitivity.
PRK or Surface Ablation
PRK or Photorefractive keratectomy is the original Excimer laser procedure introduced before LASIK in the 1980s. The only difference in the surgical procedure involves the flap creation in LASIK which is not done in PRK. The Excimer laser beam is applied on the surface of cornea without making a flap.+ Go to Top
There are distinct advantages of PRK over LASIK which makes it the preferred technique in some patients.
Advantages of Surface Ablation / PRK:
The patients who can benefit from Surface Ablation/PRK include those with:
Advanced Surface Ablation (LASEK/epiLASIK)
The term refers to newer versions of Surface Ablation and includes LASEK and epiLASIK. These are a cross between LASIK and PRK and attempt to combine the advantages of both. These involve raising a flap much thinner than that in LASIK. Though considered advancement over PRK, the results are not very much superior to it and visual recovery is still slower compared to LASIK.+ Go to Top