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The difference from LASIK is that the top layer of the epithelium is removed (and a bandage contact lens is used), so no flap is created. Recovery time is longer with PRK than with LASIK, though the outcome (after 3 months) is about the same (very good). More recently, customized ablation has been performed with LASIK, LASEK, and PRK.
PRK has advantages over LASIK in that it avoids added complications associated with the flap created during surgery. The procedure may also reduce the chances of dry eye symptoms after surgery. Due to the PRK procedure not requiring a surgical flap, athletes or individuals concerned with trauma introduced by the flap may see benefits to LASEK.
[5] [6] Due to increased depth of field in both eyes, the distance vision is significantly better than would otherwise be anticipated. Laser Blended Vision is a shape profile modification to the standard excimer laser eye surgery method that has been performed tens of millions of times worldwide, mostly as LASIK. [7]
For people with moderate to high myopia or thin corneas which cannot be treated with LASIK or PRK, the phakic intraocular lens is an alternative. [4] [5] As of 2018, roughly 9.5 million Americans have had LASIK [1] [6] and, globally, between 1991 and 2016, more than 40 million procedures were performed.
Photorefractive keratectomy (PRK) involves ablation of corneal tissue from the corneal surface using an excimer laser. The amount of tissue ablation corresponds to the amount of myopia. While PRK is a relatively safe procedure for up to 6 dioptres of myopia, the recovery phase post-surgery is usually painful. [111] [112]
Additionally, 76% of eyes had uncorrected vision of 20/40 or better at 3 years. [5] From 2 to 10 years post-operatively 43% of eyes had an increase in farsightedness by 1.00D or more. Despite this, 70% of patients reported not requiring corrective lenses for distance vision 10 years after surgery.
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