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The Excimer Laser is one of the greatest inventions in ophthalmology. The Excimer Laser is the device that physically corrects your glass prescription during surgery. 

LASIK is a type of Laser eye surgery for correcting various kinds of refractive errors or eye powers like Myopia (minus power), Hypermetropia (plus power) or Astigmatism (cylindrical power).

To treat farsightedness/ myopia, the cornea is made steeper by removing tissue outside of the central zone of the cornea. This shifts the point of focus from beyond the retina to directly on the retina.

To treat nearsightedness/ hypermetropia, tissue is removed from the central zone of the cornea. This shifts the point of focus from in front of the retina to directly on the retina.

Often nearsightedness or farsightedness is accompanied by astigmatism, which can be treated simultaneously by making the cornea more spherical.

Many people choose LASIK instead of wearing Glasses or Contact lenses.

The refractive surgery department also does PRK, Epilasik, RLE and phakic IOLs for cases which are not suitable for LASIK. These are the different types of Refractive Surgery.



This is the most researched department of our hospital. LASIK is one of the refractive surgeries that can reduce dependence on glasses and contact lenses. Because we take your eyes very seriously, before Disha jumped on to the LASIK band wagon, we closely watched all the results internationally for 6 years. We then went to all the centres individually to follow their patients till we were totally convinced. In 2007, we got the best technology, the Wavelight Allegreto AG (German) technology which is the fastest Excimer LASIK laser with the most efficient 250 Hz Radar Eye tracking system and a Pentacam (Oculyzer) to screen out risk cases. The OcuLink software enables customised cornea based refractive treatments.

The best example of the relationship between the eye tracker and the laser is to try and imagine throwing a ball at a moving object that is going 200 miles an hour. Although you can see the moving object, your reflexes are too slow to adjust to the constant changes of the moving object. As a result, every time you throw the ball you are missing the moving object. The Wavelight EX 500 Laser encompasses both a high speed eye tracker with the ability to react between 4 to 8 ms. The human eye has a maximum twitch rate of 60 Hz. This optimizes the ability of each pulse being placed on the appropriate spot on the cornea.

With a repetition rate of 500 Hz, the Alcon Wavelight EX 500 treats one dioptre in less than 2 seconds . When having your eyes treated, the speed of each laser pulse that is applied to the cornea is very important. If the laser is too slow and you have a high power, the exposed flap may shrink because of the time it takes to correct your vision. Older lasers only apply 10 to 60 pulses of the laser per second. The Alcon Wavelight EX500 Excimer Laser applies 500 individual laser pulses per second ensuring the fastest treatment for optimal results.

An example of this would be a car that only goes 10 km/h. If you were trying to go 20 kilometers it would take you 2 hours to get there but if you were driving 200 km/h it would only take you 6 minutes. In this case, the longer it takes you to have your eye treated, the higher the risk of an adverse result.

Only the Allegretto Wave Excimer Laser has the ability to provide fast and precise treatments increasing your likelihood for a successful procedure and decreasing your chances for complications due to dehydration of the flap and corneal surface.




  • Am I a candidate for LASIK?


  • You must be 18 years of age or older with stable glass power for the last one year


  • A healthy cornea


  • If you have:


Myopia upto

-10 D

Hypermetropia upto

+6 D

Astigmatism upto

± 6 D


  • Will I be awake during the procedure?


Yes. You will be awake and alert during LASIK procedure. It’s a 60 seconds bloodless intervention.



  • Is the LASIK procedure painful?


Local anesthetic drops are applied. No pain is felt.


  • How long does it take?


15 minutes altogether


  • Will I need Glasses for reading?


In most cases people over 40 need glasses for near vision.


  • Can I go blind from the Laser?


The answer is “No”


No one has ever been blinded by the Laser


No energy from the laser penetrates below the surface of the eye.


  • What are the risks or side effects?


The chances of serious complications with laser eye surgery is very low less than 1 percent.

Myopics in general have a 2% possibility of retinal detachment. LASIK neither enhances nor reduces the risk.


  • Will it eliminate the age related problems like cataract, Glaucoma etc.



  • Should both eyes be corrected at one time?


It is obvious and more convenient to correct both eyes at a time.


  • How do I know if LASIK is right for me?


We at DISHA will be pleased to provide more details or answer any other questions you may have.

The ophthalmologist would require you to undergo certain tests before you can qualify for the surgery. The most important criteria is the corneal thickness, other criteria includes corneal mapping, retinal and lens status once these are in conformity only then you’ll be able to undergo LASIK surgery.

You must be above 18 to qualify for the procedure. There are some tests which are needed to be done before someone can qualify for a Lasik surgery. Also if you are above 40 then even after LASIK surgery you might require reading glasses.

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