Brancato R, Carones F, Venturi E, Morico A, Gobbi P G
Department of Ophthalmology and Visual Sciences, Scientific Institute H.S. Raffaele, University of Milan, Italy.
J Refract Surg. 1996 May-Jun;12(4):501-10. doi: 10.3928/1081-597X-19960501-14.
The erodible mask is a new energy delivery system for the 193-nm argon fluoride excimer laser. It consists of a polymethyl-methacrylate button, whose profile is transferred by photoablation onto the corneal surface. We present the 6- and 12-month results of this technique in the correction of compound myopic astigmatism.
We performed the mask procedure on 21 eyes of 16 subjects (mean age, 30.7 years; range, 24 to 46) to correct combined myopia and astigmatism. Attempted myopic correction ranged between -1.50 diopters (D) and -10.00 D (mean, -7.07 D). Attempted astigmatic correction ranged between -1.50 D and -4.00 D (mean, -2.46 D).
Mean procedure error was: sphere +0.74 D (range, -3.00/+5.00), cylinder -1.41 D (range, -3.50/0.00) at 1 month after surgery; sphere +0.18 D (range, -2.50/+ 3.50), cylinder -1.56 D (range, -4.00/0.00) at 6 months; and sphere -1.30 D (range, -3.00/0.00), cylinder was -1.25 D (range, -2.00/-0.50) at 12 months (10 eyes). During follow up, haze values were never higher than 1, except for one case of haze 2 that regressed to 0 during follow up. Postoperative uncorrected visual acuity improved in all eyes where emmetropia was envisaged; none of the eyes lost spectacle-corrected visual acuity lines 6 or 12 months after surgery.
The erodible mask proved effective and fairly predictable mainly in the correction of the spherical component of refractive error, while the correction of astigmatism revealed greater unpredictability, with a constant trend to undercorrection.
可蚀性面罩是一种用于193纳米氟化氩准分子激光的新型能量传递系统。它由一个聚甲基丙烯酸甲酯按钮组成，其轮廓通过光消融转移到角膜表面。我们展示了该技术在矫正复合性近视散光方面6个月和12个月的结果。
我们对16名受试者的21只眼（平均年龄30.7岁；范围24至46岁）进行了面罩手术，以矫正近视和散光合并症。尝试的近视矫正范围在-1.50屈光度（D）至-10.00 D之间（平均-7.07 D）。尝试的散光矫正范围在-1.50 D至-4.00 D之间（平均-2.46 D）。
术后1个月时，平均手术误差为：球镜+0.74 D（范围，-3.00/+5.00），柱镜-1.41 D（范围，-3.50/0.00）；术后6个月时，球镜+0.18 D（范围，-2.50/+3.50），柱镜-1.56 D（范围，-4.00/0.00）；术后12个月时（10只眼），球镜-1.30 D（范围，-3.00/0.00），柱镜-1.25 D（范围，-2.00/-0.50）。在随访期间，除1例雾状混浊2级在随访期间消退至0级外，雾状混浊值从未高于1级。在所有预期达到正视的眼中，术后未矫正视力均有改善；术后6个月或12个月，无一例眼丧失矫正视力行数。
可蚀性面罩主要在矫正屈光不正的球镜成分方面被证明是有效且相当可预测的，而散光矫正显示出更大的不可预测性，且始终有欠矫正的趋势。
