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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.
In fact, the U.S. Navy now offers free PRK and LASIK surgery at the National Naval Medical Center to Naval Academy Midshipmen who intend to pursue career paths requiring good uncorrected vision, including flight school and special operations training. [citation needed] The U.S. Air Force approves the use of PRK and LASIK. [24]
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.
[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]
The procedure results in a decrease in nearsightedness. According to the PERK study, 58% of eyes were corrected within 1.00D of goal 3 years after surgery. 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.
Contoura Vision is the only technology where consistent success beyond 20/20 vision has been achieved in the majority of patients. More than 40% of the patients that were evaluated were able to read one line on the visual acuity chart more than a person with 20/20 vision, and 13.5% could read two additional lines. [citation needed]
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