近视性PRK术后1年疗效分析

目的：探讨PRK治疗近视的临床疗效。方法：1597眼近视分为轻中度、高度、超高度3组，应用SummitApex型准分子激光机行PRK治疗，术后点激素类眼药水，定期随访。结果：术后1年达到术前矫正视力者Ⅰ、Ⅱ、Ⅲ组分别为92．9％、81.3％和45.3％。除2例2服过矫，8例10眼回退-15—－5，0D行2次手术外，其余均在预计屈光度范围内。术后1年haze发生率Ⅰ，Ⅱ，Ⅲ组分别为3．0％、10.1％、27.2％，随屈光度增高，haze发生率和严重程度相应上升，2次术后haze和视力均有显著改善。激素性高眼压为8．7％，除1例2眼行抗青光眼手术治愈外，其余经对症处理均恢复正常。切削偏心＞1．0者2．2％，部分患者有轻度视觉症状。结论：PRK对-9．00D以下近视安全有效，预测性强，重复性好，而超高度近视因haze发生率较高且术前难以预料，故PRK不是其最佳选择。

An Analysis of the Clinical Effect of Myopic Photorefractive Keratectomy After One Year's Follow-up

Objective: To analyze the clinical effect of Photorefractive Keratectomy (PRK) in myopia. Methods: PRKwas performed with Summit Apex exeimer laser on 1 597 eyes which were divided into 3 groups. All the operat-ed eyes received dripping steroid eye drops and were followed up every certain periods after operation. Results:92. 9 %, 81. 3 % and 43. 5 % of the eyes in groups Ⅰ, Ⅱ and Ⅲ respectively achieved the best preoperative correct-ed visual acuity one year after operation. All eyes' refraction was in the planned scope except for 2 eyes (2 cases)over-corrected and 10 eyes(8 cases) re-operated because of regression for - 1. 5 to - 5. 00 diopters. The rate ofcorneal haze was 3.0 %, 10. 1 % and 27. 2 % in groupl Ⅰ, Ⅱ and Ⅲ respectively one year after operation, increas-ing with the rising of refraction. The corneal haze and visual acuity after re-operation improved onviorsly. Therate of steroid-high intraocular pressure(IOP) was 8. 7 %. IOP in these eyes was cured by the medicine exceptfor 2 eyes (1 case) receiving surgery. The rate of decentration over 1. 0 mm was 2. 2 % with slight visual symp-toms in some patients. Conclusion: It is revealed that PRK is safe, effective, predictive and repetitive for themyopia less than - 9.00 diopters. Otherwise,PRK is not the best choice for the superhigh myopia bbcause of itshigh rate of corneal haze and unprediction.