Hazy days? The refractive outlook of photo-refractive keratectomy/photo-astigmatic keratectomy.
The refractive outcome of 100 healthy myopic eyes which had undergone excimer laser (VISX 20/20) was evaluated at 6 months post-treatment. Patients were subdivided into Group A (n = 51, < -5.00 D spherical equivalent (SE)), Group B (n = 38, -5.00 to < -10.00 D SE) and Group C (n = 11, > -10.00 D SE). The mean myopic sphere decreased from -2.88 to -0.22 DS, -5.94 to -0.43 DS and -12.61 to -1.83 DS, respectively. Cylinder reduction ranged from 23 to 53%, effectiveness: decreasing with increasing associated myopia. Sixty-six percent of all subjects attained an SE correction within 1.00 D of that attempted, however, 80% actually achieved vision of 6/12 or better. At 6 months only six eyes were not within one line of their pre-operative best spectacle visual acuity (BSVA) and four of these exhibited haze greater than Grade 1. In low myopia, photorefractive keratectomy (PRK) appears to be highly successful with 93% of subjects with an initial myopia of < -5.00 D SE obtaining 6/12 or better vision. However, photo-astigmatic refractive keratectomy (PARK) was variable within all groups.
Corneal Diseases and Excimer Laser Unit, Sunderland Eye Infirmary, UK.
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Weed
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McGhee
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Bryce
D000328:Adult; D005260:Female; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular; D013997:Time Factors; D016896:Treatment Outcome; D014792:Visual Acuity