Prakash Netra Kendr (P.N.K.)

Refractive Surgeries

Refractive Surgeries A

LASIK Our eyes are an asset to our body, being the most attractive and vibrant feature. If there is a refractive error (a Difference between the focal length of the cornea and lens, and the length of the eye, resulting in myopia or hyper myopia) one may have to use spectacles or contact lenses. These may lead to a feeling of dependency; eyesight defects are not is not allowed in taken very seriously in some professions and is not practical for sports, dusty or smoky environments or for swimming. A refractive surgery offers a means to correct vision problems for those who do not want to wear or cannot wear spectacles or contact lenses. LASIK (Laser Assisted In Situ Keratomileusis) is one amongst a few surgeries that is a permanent solution to reduce the power of the eye. Laser energy is utilized to change the shape of the cornea, thereby reducing the power. It is SAFE and one of the MOST WIDELY performed surgeries WORLDWIDE, since past more than 20 years.

Are You Eligible? Yes If:

  • You are 18 years of age or older
  • Your spectacle number has been stable for the last 12 months.
  • You have healthy eyes and a suitably thick cornea (our doctors will do a test called Corneal Topography to determine this).
  • You don't have any systemic diseases that may alter surgical healing. E.g. Autoimmune disease.
  • You understand the procedure completely and have realistic expectations of your results (procedure is not done during pregnancy and lactation).


LASIK can be done for you if the shape and thickness of your cornea is suitable for your powers the procedure. The thickness of the cornea changes once it is lasered. A minimum thickness is left behind for the safety of the eye the thickness of the cornea is not compromised. Best results are seen in the ones with lower powers.

It is a simple procedure where surgery takes about 15 minutes and no injections are used. You do not require the unsightly bandage after surgery and you can resume your activities within 1-2 days.

If You Are Wearing Contact Lenses:

Please check if your lenses are soft? Discontinue them at least 2 weeks prior to your baseline evaluation and surgery. If you use TORIC Lenses or RGP Lenses (Rigid Gas Permeable), please discontinue them at least 3 weeks before you are scheduled for evaluation and surgery.

Tell our Doctors:

  • About any past or present medical or eye disease.
  • About any medicines you may be taking, whether for the eye or other conditions of the body.
  • About any allergies that you may have.

What's New?

Also now we offer customized LASIK with 'CustomVue' (advanced VISXTM technologies, AMO), an advanced technology that offers an 'Individualized' laser vision correction. The result is more precise since final correction is done using WavescanTM - based digital technology, and the doctors can capture unique imperfections in each individual vision that could not have been measured before by using standard method.

What is LASEK?

If the thickness of the cornea is not adequate to undergo a LASIK procedure, a modified procedure LASEK (Laser Assisted Sub-Epithelial Keratomileusis) is performed. In this procedure a thinner flap of the cornea is created and after the laser treatment, a BCL (Bandage Contact Lens) is placed on the eye for about 7 to 10 days. You may have some pain or discomfort after a LASEK surgery for about 2-3 days.

The only difference between LASIK & LASEK procedures is the rate of post procedure recovery. In LASIK it is about 1-2 days whereas in LASEK it is 10 - 14 days. Long term results of Refractive Error Corrections are the same in both procedures.

What's Presbyopia?

Presbyopia is the use of glasses for near sightedness after the age of 40. The advanced CustomVue is also designed for use in Presbyopia. This reduces your dependency on glasses or contact lenses.

Remember LASIK Is No Miracle:

It is SURGERY and not MAGIC. This scientifically designed technique allows you to see better without glasses and substantially "reduces" your dependency on them. The aim is to always get you down to ZERO Power. You will not need to use glasses for all normal activities but you may have to use some power while driving or watching movies, depending upon the amount of the power of your glasses or the thickness of the corneas of your eyes.

Note: Like any other procedure performed on the human body, LASIK too involves some amount of risk and complications, but these are limited to certain cases only.

Customvue LASIK Correction Offers:

  • Customized Wavefront vision correction.
  • Accuracy provided by 3-D active tracker.
  • Unique "IRIS Registration" technology.

Implantable Collamer Lens (ICL):

What is an ICL?

It is a contact lens designed for permanent implantation inside the eye for the purpose of removal of spectacles. It is also known as implantable contact lens or Phakic Intraocular Lens and is individually customised and manufactured for each eye that is to be treated. The actual meaning of the word ICL is 'Implantable Collamer Lens' based on the material of the lens (collamer).

Who is a candidate for ICL?

Nearly anyone seeking clearer vision may be an ICL candidate. Should have Myopia (nearsightedness), hyperopia (farsightedness) and/ or astigmatism (cylindrical power) Usually the procedure is performed in those individuals who are not suitable for LASIK or LASEK (Epi-Lasik) due to high power, thin corneas or sometimes even those with dry eyes or Corneal Diseases like stable Keratoconus.

How do I know that I am a suitable candidate for ICL?

You are between 21 and 45 years of age and desiring removal of glasses. Want to experience superior vision correction. The ideal ICL candidate has not undergone any Eye surgery (though your surgeon may opt to do it as a secondary procedure in certain cases), Do not have a history of eye disease such as iritis, glaucoma or diabetic retinopathy. Women who are pregnant or nursing should wait to have the ICL implanted.

How does my doctor know that I am a suitable candidate for ICL?

You will first undergo an accurate refraction to determine the exact power of your eye and be assessed for stability of the spectacle power. Then a complete eye examination including a dilated evaluation of the retina will be done. A corneal topography will be done to map the Contours and Thickness of the Cornea and a Specular Microscopy to Assess the Corneal endothelial cell density (health of the innermost layer of the cornea).

If you have high powers, the quality of vision achieved may be better after ICL than after LASIK

How does my doctor know that I am not a suitable candidate for ICL?

If the space where the ICL is intended to be placed is small and if your endothelial cell density is not adequate you will not undergo the surgery.

Where is the ICL placed?

ICL is inserted through a small, self sealing incision (much like that used for cataract surgery by phacoemulsification) and placed inside the eye just behind the iris, in front of the natural lens of the eye. The ICL is designed not to touch any internal eye structures and stay in place.

Is the ICL removable?

It is designed to stay permanently inside the eye and is made of a biocompatible material. However, if necessary can be removed without causing much damage to the ocular structures since it does not cause any alteration in them. It is usually removed and replaced by a different kind of lens (IOL) when you develop cataract and require surgery for the same.

Does it hurt to place an ICL?

No, most patients state that they are very comfortable throughout the procedure. We use a topical anaesthetic drop prior to the procedure. Once the procedure is done you can neither feel nor see the lens except by a trained ophthalmologist. The only CHANGE that you feel is BETTER VISION.

What is the preparation required before surgery?

Discontinue lenses if you are a contact lens user (like described for LASIK). Your doctor will examine you and perform the requisite tests to see if you are a suitable candidate. If so certain measurements will be done manually and filled in a form which is sent to the company. ICL is manufactured for each of your eyes according to the measurements sent. So it is a totally customised procedure wherein one lens cannot be used for someone else. So after the measurements are done it may take a week to 3 weeks for the lens to be made available.

How long will I be required to rest?

The surgery would take about 15 minutes and then you can resume all normal activities once you are discharged apart from restricting splashing water over the face for a week.

Do you operate both eyes together?

No. We keep a gap of about a week before we operate on the other eye.

What is a Toric ICL?

It is a variant of ICL which corrects nearsightedness/farsightedness as well as astigmatism (cylindrical power) in a single procedure. Each lens is custom- made to meet the needs of the individual eye.

What complications can occur?

There may be some residual power, which may require you to wear glasses, contact lenses, undergo LASIK or rotation of the ICL in cases of Toric lenses.

You may develop glaucoma, but it is usually transient and amenable to treatment by eye-drops. Initial high pressure is usual and oral medicines and eye drops are routinely prescribed for the same.

Cataract may develop per-operatively (rare 0.2- 0.8%). In case it becomes clinically significant, the ICL can be removed, cataract extraction done and a single lens is implanted to serve the same purpose.

Corneal swelling may occur, which may be transient, which resolves with eye drops or very rarely, may become permanent due to damage to endothelial cells requiring corneal transplant. Preoperatively and on subsequent visits, a specular microscopy is done to assess the endothelial health.

Rare Retinal complications like retinal detachment or central retinal edema (CME) or new blood vessels (CNVM) may occur. These are complications that can be seen more commonly in high myopes who may develop these types of complications even without undergoing any surgery.

What is the track record of ICL?

In a USFDA clinical trial, > 99% patients were satisfied with their implants. It has a track record of stable, consistently excellent clinical outcomes. The lens has been available internationally for over 15 years.

We have been performing ICL for the past 15 years at Prakash Netra Kendr. If you opt to undergo this procedure you will be treated by a team of the most empathetic and gentle paramedical personnel and a team of competent doctors. We are sure the entire experience will be pleasant one for you.

Refractive Surgeries B


It represents a blade-free, fully customised laser vision correction, and is the premium LASIK solution available in the world today. It can possible be described as a LASIK procedure tailored for each of your eyes.

Your personalize LASIK procedure can be easily described in 3 steps:

Step 1: Measurement

WaveScan technology is used to measure the gross and minute imperfections in your eyes so that your iLASIK surgeon can custom-fit your treatment to your individual eyes.

Step 2: PersonalisediLASIK flap

Next, the first of two lasers - called an IntraLase - is used to create a flap on the surface of your eye. This blade-free method is considered more accurate in terms of thickness, profile and smoothness of. the flap

Step 3: Custom laser vision correction

Finally, the Advanced CustomVue laser corrects your power to the specifications of your eye that have been measured earlier. It offers a high precision in terms of correction and smoothening out the irregularities of vision thereby offering lesser chances of night-time glare and loss of contrast

Our Specialities

