Niles C, Culp B, Teal P
Douglas Memorial Hospital Medical Centre, Fort Erie, Ontario, Canada.
J Cataract Refract Surg. 1996 May;22(4):436-40. doi: 10.1016/s0886-3350(96)80038-1.
To evaluate the results of excimer laser photorefractive keratectomy (PRK) using an erodible mask to treat myopic astigmatism.
Douglas Memorial Hospital Medical Centre, Fore Erie, Ontario, Canada.
Photorefractive keratectomy was done on 25 consecutive eyes of 25 patients with myopic astigmatism using the OmniMed excimer laser and a compound single-use myopic erodible mask manufactured to produce a specific spherical and cylindrical correction for each individual patient. Follow-up ranged from 6 months for 25 patients to 1 year for 5 patients.
Six months after PRK, the mean preoperative sphere of -7.46 diopters (D) decreased to -0.17 D and the mean preoperative cylinder of 2.31 D dropped to 0.69 D; 73% of astigmatism was corrected. In the five eyes followed for 1 year, 94% of astigmatism was corrected. Correction of the myopic component was less predictable, with a wider than anticipated range of overcorrection.
Excimer laser PRK successfully corrected myopic astigmatism in patients with low and high myopia. The less predictable myopia results may have been secondary to increased procedure time, corneal dehydration, and difficulty in patient fixation and thus alignment.
评估使用可蚀性面罩的准分子激光屈光性角膜切削术（PRK）治疗近视散光的效果。
加拿大安大略省伊利堡道格拉斯纪念医院医疗中心。
使用OmniMed准分子激光和为每位患者定制的一次性复合近视可蚀性面罩，对25例近视散光患者的25只眼睛连续进行屈光性角膜切削术。随访时间为25例患者6个月，5例患者1年。
PRK术后6个月，术前平均球镜度数从-7.46屈光度（D）降至-0.17 D，术前平均柱镜度数从2.31 D降至0.69 D；73%的散光得到矫正。在随访1年的5只眼中，94%的散光得到矫正。近视成分的矫正效果较难预测，过矫范围比预期更宽。
准分子激光PRK成功矫正了低度和高度近视患者的近视散光。近视矫正效果较难预测可能是由于手术时间延长、角膜脱水以及患者固视和因此导致的对准困难。
