[Changes in visual function in myopia 12 months after photorefractive keratectomy].
1. 110 myopes undergoing photorefractive keratectomy (PRK) with refraction from -0.25 D to -12.0 D were divided into 4 groups: A: upto -2.75 D, B: -3.0 D to -5.75 D, C: -6.0 D to -8.75 D and D: -9.0 D to -12.0 D. BCVA using the computerized method with Landolt rings and CS using an adjustment method with ascendant and descendent approach to threshold contrast adaptation on a computerized system of the Contrast sensitivity 8010 type were examined in patients before and 1 year after PRK. 20 emmetropes of the same median age were evaluated as a control group. 2. Preoperative BCVA and CS in myopes of all four groups was significantly lower (p < 0.05 az p < 0.001), compared to controls. Decrease of functions was proportional to refraction. 3. With increasing refraction less patients were within +/- 0.5 D and +/- 1.0 after surgery. 4. Twelve months after PRK, BCVA in the group A reached the level of controls, CS in the same time interval was equal to control even in groups A and B. 5. According to results of our study, PRK is a suitable method for myopia upto -6.0 D.
Langrová
H
H
Ocní klinika FN, Hradec Králové.
Hejcmanová
D
D
Peregrin
J
J
D000293:Adolescent; D000328:Adult; D015350:Contrast Sensitivity; D005260:Female; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular; D014792:Visual Acuity