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First Author: H.Mohammad Rabei IRAN
Co Author(s): N. Moslehi Moghaddam K. Sheibani
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To study the regression rate after photorefractive keratectomy for treatment of hyperopia and hyperopic astigmatism.
Nagah Eye Clinic, Tehran, Iran.
In this retrospective non-randomized non-controlled clinical trial,171 eyes from 91 patients with spherical equivalent of 2.25ḟ1.86 (-1.50 to 6.75) diopter and the mean hyperopia of 3.00ḟ1.67 (0.50 to 7.00) diopter and mean cylinder of -1.51ḟ1.45 (0.00 to -6:00) diopter were treated using Bausch & Lomb Technolas 217Z Excimer Laser. Pre-operation evaluation included; best spectacle corrected visual acuit, manifest and cycloplegic refraction, diameter of optical zone, central corneal thickness, simulated keratometry. Postoperative evaluation performed at least six months after the procedure included the same evaluations.
The mean regression was 0.35ḟ1.04 and the manifest refraction equivalent in ḟ0.5 diopter range was reported in 57.1%, manifest refraction equivalent in ḟ1.00 diopter range in 85.7 % and manifest refraction equivalent in ḟ2.00 diopter range in 96.6% of eyes. Uncorrected visual acuity of 20/20 or better was reported in 37.1% and 20/40 or better was reported in 92%. Loss of the best spectacle corrected visual acuity of one line was observed in 13.4% and 2 lines or more in 5.7% of eyes.
Photorefractive keratectomy offers effective correction in hyperopia particularly in patients with cylinder less than -2.5 diopter, keratometry less than +43.00 diopter and corneal thickness of more than 550 micrometer.