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What are the Different Types of Glass Removal Procedures?

Laser vision correction surgery or lens-based surgeries are used to correct common vision problems (nearsightedness, farsightedness, astigmatism and presbyopia) to reduce your dependence on prescription eyeglasses and/or contact lenses.
Most types of laser vision correction surgery reshape your cornea, the clear front part of your eye. That lets light travel through it and focus properly on the back of your eye, or retina. The three main ways to improve focus are reshaping a lens/cornea you already have, adding a lens you didn’t have, or replacing a lens that isn’t working.

LASIK , or laser in-situ keratomileusis, works for people who are nearsighted, farsighted, or have astigmatism. The doctor reshapes the tissue underneath your cornea so it can focus light properly. She also makes a flap in the outer layer of the cornea so she can get to the tissue underneath. The flap is what makes LASIK different from other procedures. The doctor may also use a type computer imaging called wavefront technology to create a detailed image of your cornea that she can use as a guide.

Lasik Procedure

PRK, or photorefractive keratectomy, also called ASA (advanced surface ablation) is used to correct mild to moderate nearsightedness, farsightedness, or astigmatism. Like LASIK, a surgeon uses a laser to reshape your cornea. But it only affects the cornea’s surface, not the tissue underneath and no flap is created in this procedure unlike LASIK. Your doctor may also use computer imaging of the cornea.


This is an advanced laser base procedure performed on the cornea where no flap is created. This procedure combines the benefit of LASIK and PRK. Here a disc of tissue is removed with the help of laser from inside the cornea that allows the reshaping of the cornea. So, no flap and no alteration on the surface of cornea. Smile lasik preserves the strength of the cornea better.
RLE stands for refractive lens exchange. Other names include PRELEX, clear lens exchange (CLE), clear lens extraction (CLE), and refractive lens replacement (RLR). It’s the same as cataract surgery. The doctor makes a small cut at the edge of your cornea. She removes your natural lens and replaces it with a silicone or plastic lens. It can correct extreme farsightedness or nearsightedness. It works well for people with thin corneas, dry eyes, or other minor cornea problems.


Phakic Intraocular Lens Implants
Phakic intraocular lens implants are designed for people who are too nearsighted for LASIK and PRK. The doctor makes a small incision at the edge of your cornea and then inserts a new lens into the eye without touching the already existing lens in the patient’s eye. So, in this procedure adds an additional lens into the patient’s eye. So unlike RLE, your natural lens stays in place. This procedure does not affect the shape of the cornea and hence gives very good quality of vision with near negligible night vision issues in high myopes.

Phakic Intraocular

Risks associated with laser refractive surgery

  • over-correction
  • under-correction
  • dry eyes
  • glare and halos
  • infection
  • scarring
  • decreased vision


Risks associated with non-laser refractive surgery

  • light sensitivity
  • slight over-correction in the early postoperative period that will stabilize within a few months


Who is a good candidate for refractive surgery?
Generally, a good candidate is over the age of 21, has had a stable prescription for 6 months; is nearsighted up to 20 diopters, farsighted up to 4 diopters, or has astigmatism up to 5 diopters; is not pregnant or nursing; and has no history of herpes infection in the eye, keratoconus, advanced glaucoma or cataracts.

What results can you expect?
After a glass removal procedure, most patients can see well enough without their glasses or contact lenses to perform all daily activities, including driving. However, people over the age of 40 may need to wear reading glasses after the procedure. The most common complications are under- and over-correction, which can be successfully treated. You will have a good idea about what to expect after your ophthalmologist has examined you, reviewed all of the screening tests, and explained the surgery to you.
The choice of procedure is dependent on patient’s pre lasik evaluation. Not all procedures are suitable for everyone. Your lasik eye doctor can guide you about the most suitable glass removal procedure for your eyes.

About Advanced Eye Hospital and Institute:
Advanced Eye Hospital and Institute in Navi Mumbai is one of the best eye hospitals in Mumbai.  Eye check-up rooms and the operation theatres are state-of-art and equipped with the best diagnostic and surgery machines. Personalised care, infection free modular operation theatres and beautiful ambience complement the cutting-edge eye care offered at AEHI. Besides treating patients from Kharghar, Nerul, Vashi and Panvel, patients from all over western India travel to AEHI for world class eye care management.