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LASIK (Laser assisted in-situ keratomileusis) is a refractive surgical procedure that results in rapid recovery of vision and has the capability to benefit patients with nearsightedness, farsightedness, and astigmatism by reducing dependence on eyeglasses and contact lenses.
Wave front Guided Lasik (Customized Lasik or C-Lasik) is fast emerging as a better tool to restore the quality of vision. The surgical procedure is similar in both the procedures and the common questions presented below are relevant to both.
It is now known that sphere and cylinder are not the only vision disorders or aberrations in an optical system of a human eye. There is a second category of optical defects, called higher-order aberrations, that represent residual irregularities in the optical structure of the eye. Higher-order aberrations affect the quality of vision, The aberrometer which measures all the optical imperfection on a human eye.
These higher order aberrations along with the usual sphere and cylinder aberrations can now be measured and documented with the help of a special machine called an aberrometer using the wave front technology.There are several machines available in the market to measure these aberrations eg. Zyoptics( Bausch & Lomb) & OPD Scan( Nidek).Out of the machines available OPD Scan from Nidek appears to be the best machine till date.At our centre this is the machine that is being used.
Sophisticated software then converts the map into the clinical ablation profile prescription. The prescription is transferred electronically to the computer controlling the laser . The computer calculates the shot pattern (i.e., where and how the laser will operate on the cornea) required for the correction of both the patient's lower and higher order aberrations. These laser machines are the latest generation machines with special laser delivery systems capable of handling such corrections.
Data map of optical imperfection in a human eye accessed by wave front technology which is then corrected by the laser.
Lasik laser can correct the vision to normal (6/6 without glasses) in the absence of any other eye pathology. With C - Lasik, it is now possible in some cases to find a quality of vision, which in all be even better than what is achievable with simple Lasik laser.
In I-Lasik, the flap is made with another laser called Femto Laser and rest of the is same. Therefore it is also known as Femto lasik or bladeless lasik.
The person should be at least 18 years of age and should not have a significant increase in the prescribed power of spectacles in the past one year. Pregnant Women may not be suitable candidates.
The surgeon uses a microkeratome to create the flap. The flap is then positioned to one side of the corneal "bed" as the Excimer laser beam (left) is applied.
The laser ablation is completed and the flap is replaced. Once The flap is returned to preoperative position, the surgeon carefully checks and rechecks the flap to be certain it is secure and well-positioned.
Lasik involves extensive computer analysis of the eye. Patient is then asked to come on the scheduled day for the laser treatment. Local anaesthetic eye drops are instilled in the eye to achieve a pain free procedure. The patient is now made to lie under the laser machine and asked to fix his gaze at a red light. The data of the patient is fed into the computer memory of the laser. A special machine called the microkeratome is used to pick up a thin corneal flap of 160 microns (equivalent to an onion skin). Laser is delivered to the cornea under this flap to correct the spectacle number. It takes 20 to 60 seconds to complete the laser delivery to one eye. The corneal flap is placed back in position where it holds strongly within two minutes due to its natural bonding properties. The entire procedure takes about 10 minutes.
The laser procedure itself does not hurt. A slight pressure may be felt during the procedure. There is a possibility of some degree of discomfort after the procedure for 3 to 4 hours which is easily controlled by medication.
Your eye or eyes (if both are treated) will likely be quite blurry immediately after your LASIK surgery. Do not be alarmed. This is natural and expected. You will likely awaken the next morning after your LASIK surgery with much improved vision. Your vision should also improve over the first two to three weeks following surgery.
95% of the people will be totally free from their spectacles. 5% will have mild variation from their zero targeted correction due to varying healing patterns in different individuals, but will have their dependency reduced on spectacles. With a little more lasering without any extra fee, an attempt may be made after 6 months to correct these individuals further.
The effects of lasik on the cornea are permanent. Sometimes, internal changes within an eye may come with age and these may have some effect on the overall visual status. For example, a high myopia may progress even after the age of 18 years, or a person may require reading glasses after the age of forty like any normal individual
The results are often dramatic and very rapid, with most patients seeing well enough to drive a car without correction the very next day. However, the best post-operative visual acuity may not be obtained until 2 to 3 weeks, or in some cases, even a few months, after the procedure.
Lasik is a very safe procedure but like any other surgical procedure it can have some complications which are extremely rare if a proper screening check is done prior to the procedure. This includes measuring the corneal thickness with an ultrasound, mapping the corneal topography and a retina check. Nobody in our surgical experience has ever lost sight due to this procedure.
Infection is a serious complication and could lead to deterioration of the vision. Infection is usually rare and can be well controlled with medications with little or no loss of quality of vision. At our centre, we have had no case of infection till date.
The medical community can only speak of the future by accessing the data from the surgeries performed within the last ten years. The data reveals a very positive healing response of the eye giving doctors no reason to be concerned about effects beyond ten years.
Yes, in most of the cases. However one eye may be done at a time by choice
Generally speaking a patient is on eye drops for 3 to 6 weeks. This is dependant of the level of correction attempted and the individual healing response.
Yes, many in India as well in several other countries. This also includes several eye specialists.
Each of your eyes has two lenses - the cornea ( the general focusing lens ) and the inside lens ( the fine focusing lens ). Laser surgery works effectively to correct the general focusing lens, no matter what your age. However, the inside fine focusing lens of your eye hardens and no longer provides clear reading vision after the age of 45 years. So, even after laser surgery, you would need reading glasses after 45 years of age. However, laser surgery will give you clear vision for all distance activities without spectacles.
To make the procedure more affordable, we have been able to bring down the cost of all the procedures as listed below:-
Lasik: Rs.25,000/- for both eyes
C-lasik: Rs.30,000/- for both eyes
Thin Flap Lasik: Rs.40,000/- for both eyes
I- Lasik: Rs.85,000/- for both eyes
If you still have some queries, please feel free to contact us.