Weinstock S J, Machat J J
Department of Ophthalmology, University of Toronto, Ontario, Canada.
CLAO J. 1993 Apr;19(2):133-6.
We present the preliminary refractive and visual results in 46 sighted eyes that had undergone excimer photorefractive keratectomy. Although our sample size was small and the follow-up relatively limited (3-6 months), a few important conclusions were drawn. The visual and refractive results compare quite favorably to the preliminary results with radial keratotomy. Thirty-four of 46 patients (74%) were within 1 D of emmetropia; and 45 (98%) were within 2 D at the end of the follow-up period. Forty-four patients (96%) achieved at least 20/40 vision, with more than half achieving 20/20 or better. We encountered no significant vision threatening complications. Twenty of 46 patients (43%) complained of night vision disturbances, but symptoms improved in all patients by 6 months. The majority of patients developed trace epithelial haze; however, corneal haze did not produce reductions in visual acuity. Though the preliminary results of our study of the safety and efficacy of excimer photorefractive keratectomy are promising, further study of long-term vision stability and corneal clarity is clearly needed.
我们展示了46只接受准分子激光屈光性角膜切削术的有视力眼睛的初步屈光和视觉结果。尽管我们的样本量较小且随访时间相对有限（3 - 6个月），但仍得出了一些重要结论。视觉和屈光结果与放射状角膜切开术的初步结果相比相当不错。46例患者中有34例（74%）屈光不正度数在正视眼1屈光度范围内；随访期末，45例（98%）在2屈光度范围内。44例患者（96%）视力至少达到20/40，超过半数患者视力达到20/20或更好。我们未遇到严重威胁视力的并发症。46例患者中有20例（43%）抱怨有夜间视力障碍，但所有患者的症状在6个月时均有所改善。大多数患者出现了轻微的上皮下雾状混浊；然而，角膜混浊并未导致视力下降。尽管我们对准分子激光屈光性角膜切削术安全性和有效性的初步研究结果很有前景，但显然仍需要进一步研究长期视力稳定性和角膜清晰度。
