Photorefractive keratectomy

What Is Advanced Surface Ablation / PRK

Although it is one of the earliest type of modern laser eye procedures described, this technique is also commonly performed in special cases. This procedure has the advantage of not requiring a flap as well as the benefit of not reshaping too deep into the cornea. This procedure is therefore used for patients interested in getting rid of their glasses but have thinner corneas than normal. The only minor disadvantage of this procedure however is the initial discomfort which is felt in the first few days of the post operative period. In this procedure, the top layer of the cornea is first peeled away by a laser. Then the bed of the cornea is then re- shaped using a excimer laser. After the procedure, a protective contact lens is placed on the corneal bed so as to prevent the eyelids from rubbing onto the cornea. The top layer of the cornea quickly heals in 48-72 hours and the contact lens is then removed. Visual recovery is complete by the end of 5-7 days.

Eye problems that can be treated with Advanced Surface Ablation / PRK

Treatment Myopia Astigmatism Hyperopia
Advanced Surface Ablation
Photorefractive Keratectomy

Benefits of Advanced Surface Ablation

World Class Technology

The technologies that are utilised to perform LASIK Eye Surgery are really crucial parts of the whole process. Lasik Surgeons use highly specialised excimer laser for the process that emits UV beams to reshape the cornea in order to treat common vision problems like shortsightedness, farsightedness and astigmatism. At Sri Eye Care, LASIK is performed with the Alcon Wavelight™ EX500 flying spot Laser. This machine is the fastest available machine which takes only 1.4sec per diopter of power correction. The machine is linked to the Topolyser™ corneal analysis tool and is able to perform customised CONTOURA™ vision correction as well.

There are three essential steps to perform a successful LASIK surgery

  • Right ArrowA surgical tool term as a microkeratome or a femtosecond laser is used to create a thin, circular flap in the cornea. Further it is used to access the underlying cornea (called the stroma).
  • Right Arrow IconAn excimer laser is used to reshape the corneal stroma.
  • IconThe cornea is laid back in place, restoring the vision without stitches
Alcon Wavelight Ex500

Eye Problems That can be Treated with Advanced Surface Ablation


Advanced Surface Ablation

Before Advanced Surface Ablation

When you book your appointment at Sri Eye Care, we request you to please mention your interest in undergoing Laser Eye Surgery to our care co-ordinator. You should discontinue your contact lenses before your visit [1 week for soft contact lenses and 4 weeks if you wear Rigid lenses]. We would also request you to bring an attendant with you, along with a pair of sunglasses. This is because your eye doctor will dilate your pupils to do a complete evaluation of the eye, which is the first step in your journey towards spectacle-free vision. You will also not be able to drive yourself after your examination due to your dilated pupils.

Our specialists will check for stability of your glasses power which is the main pre-requisite before undergoing Laser eye surgery. Therefore we request you to bring a copy of your old glasses prescription or your old glasses so that we may understand the stability of your eye power.

Lasik Examination
During Laser Eye Surgery

During Advanced Surface Ablation

Few minutes prior to the surgery, you will be given some eye drops and medication to help you relax. You will be awake throughout the procedure. The surgeon will instil drops in your eyes to numb your eyes completely. Your eye will be positioned under the laser and your eyelids will be kept open. The surgeon uses a computer to adjust the laser for your particular prescription. You will need to keep looking straight or as the surgeon directs you throughout the procedure. Your cornea will be reshaped with the laser light . The process is completely painless, but you may feel some pressure on the eye during the suction phase of the laser.

After Advanced Surface Ablation

You will have to rest for a bit. A temporary contact lens is placed on your corneas to help the healing of the epithelium. This may cause some mild irritation and pricking until the time the contact lenses are removed which is usually 5-7 days. Immediately after the surgery blurry and hazy vision is also normal. As time passes by, your vision improves and will be restored within 5-7 days after the contact lenses are removed. Follow your doctor's instructions and use all the drops as advised for the prescribed number of days and come for follow ups as advised by your surgeon. You will also have to use UV protection sunglasses for a while going outdoors.

After  Laser Eye Surgery

Frequently Asked Questions

Does laser eye surgery hurt? Logo Icon

Laser Eye Surgery is usually painless, but you may experience a kind of pressure in your eyes during the procedure, but this may be temporary.

How long does laser eye surgery take? Icon

Laser eye surgery takes a maximum of 30 minutes, but in most cases it is done within 10-12 minutes

When can I go back to work after having laser eye surgery? Eye Icon

If you have undergone ReLEx SMILE or LASIK, you can resume your work the next day after your procedure. With PRK/ASA it may need 5- 7days to resume your work. However, you may need to wait until your eyes become fully comfortable and clear. You are also advised to as your surgeon post-surgery before resuming your job.

Is laser eye surgery safe? Icon

With modern day laser technology, laser eye surgery is extremely safe. Our team of specialists always use the highest safety parameters and keep a high ceiling safety profile before advising Laser correction for all patients.

Should I keep reading glasses with laser eye surgery? Icon

See, the laser surgery aims to provide a 'permanent' solution to your eyes, but it has to be accepted that your eyes change with age, reading glasses are optional with the surgery. However, using them may be an added advantage.

When is Laser eye surgery procedure not recommended? Icon

Laser eye surgery is usually not recommended for people where the spectacle power has not stabilised. Laser eye surgery is not done for individuals below 18 years. An eye with keratoconus is a strict no-no for undergoing any kind of laser eye surgery. Also, if the corneal profile and thickness are not suitable, your surgeon may defer the procedure or offer any other alternate means of achieving spectacle free vision

What is SMILE Xtra or LASIK Xtra? Do I need this procedure instead of normal SMILE or LASIK? Icon

SMILE Xtra and LASIK Xtra are recently introduced procedures that offer an additional layer of protection for the cornea after surgeries. This process combines SMILE/LASIK procedure with Riboflavin assisted Corneal Collagen Cross Linking [C3R] procedure to aid in strengthening of the corneal layers. SMILE/LASIK Xtra procedure is not recommended for all patients undergoing laser eye surgery. It will only be recommended by our specialists only if your corneal profile is borderline or shows some indications of future thinning.

What is bladeless LASIK? Eye Icon

Are there any advantages of ReLEx SMILE over conventional LASIK? Bladeless LASIK or Femto LASIK is an all-laser LASIK wherein even the creation of the flap is performed by femtosecond LASER. The thickness and accuracy of the flap depth is more precise with this method as compared to conventional LASIK procedure.

Is ReLEx SMILE the same as Bladeless/FemtoLASIK? Logo

While ReLEx SMILE is also an all laser procedure, it however does not need the creation of a corneal flap for correction of the power. Here a disc shaped tissue called as the “lenticule” is fashioned by the femtosecond layer which is extracted through a 2mm incision.

What is CONTOURA® vision? Do I need Contoura™ vision instead of LASIK? Logo

Contoura vision is an advanced type of LASIK laser surgery. Here, microscopic irregularities on the patient’s cornea are mapped on the corneal topographer. These irregularities are then transferred to the LASIK suite. At Sri Eye Care, we use the Alcon WAVELIGHT™ suite which automatically maps and corrects these irregularities while also correcting the power. Contoura™ vision is required only for patients who have significant irregularities on their cornea. If not a simple LASIK would suffice.

Should I choose ReLEx SMILE over LASIK for my eyes? Eye Icon

Normally your specialist, after performing a thorough evaluation, would suggest the ideal procedure recommended for your eyes. However, if you are deemed to be suitable for both ReLEx SMILE as well as LASIK, you can take a conscious decision based on the relative advantages of SMILE over LASIK. The flapless nature of ReLEx SMILE makes healing of the incision faster (within 48 hours as compared to 5-7days with LASIK). Since a flap is created in LASIK, it causes a larger proportion of corneal nerves to be severed. These corneal nerves are important for tear production and hence patients experience dry eyes post-operatively. However, in SMILE since no flap is created, the post-operative dry eye is significantly lesser as compared to LASIK.

This advantage might be more relevant in people who work on computers for long hours who may be more prone to dry eyes. The flapless nature of this procedure also affords a higher safety profile for those who have an active lifestyle and play contact sports. Post LASIK there are minor chances of the flap being dislocated due to any injury. This risk is not there in SMILE. Although SMILE does have some advantages over LASIK, the visual recovery and accuracy of vision correction is equal in both procedures.