Changes in corneal topography after excimer laser photorefractive keratectomy for myopia.
Changes in corneal topography after excimer laser photorefractive keratectomy for myopia.
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DOI：
10.1016/s0161-6420(91)32127-4
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发表时间：
1991-09
期刊：
影响因子：
13.7
通讯作者：
S. Wilson;S. Klyce;M. McDonald;J. C. Liu;H. Kaufman
中科院分区：
文献类型：
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作者：
S. Wilson;S. Klyce;M. McDonald;J. C. Liu;H. Kaufman
对17只正常人近视准分子激光屈光性角膜切削术(PRK)术后1年内的角膜地形图进行了计算机辅助分析。激光消融中央角膜产生了一个光学区，其能量平稳地过渡到周边角膜。部分眼(0.5 mm的3只眼，0.5~1.0 mm的10只眼，1~1.5 mm的3只眼，2.1 mm的1只眼)可观察到消融中心偏心，提示仔细的激光对准是非常重要的。需要改进的方法将消融术对准入射瞳孔的中心。在17只眼中，12只眼的地形图在PRK后3-7个月内稳定下来。在其余5只眼中，在6个月和12个月的检查期间，中央消融功率变化超过0.5屈光度(D)。回归在矫正大于5D的眼中更为常见且更加明显，而大多数矫正在5D或以下的眼在中央消融功率的最终改变与矫正之间显示出良好的一致性。2只眼最佳矫正眼镜视力丧失至少两行，这可归因于不规则散光、角膜偏心和/或角膜混浊。
Computer-assisted analysis of corneal topography was performed in 17 normally sighted human eyes during the first year after excimer laser photorefractive keratectomy (PRK) for myopia. Laser ablation of the central cornea produced an optical zone with a smooth power transition to the peripheral cornea. Decentration of the ablation was noted in some eyes (<0.5 mm in 3 eyes, 0.5 to 1.0 mm in 10 eyes, 1 to 1.5 mm in 3 eyes, and 2.1 mm in 1 eye), suggesting that careful alignment of the laser beam is critical. Improved methods to align the ablation within the center of the entrance pupil are needed. In 12 of 17 eyes, the topographic pattern appeared to stabilize between 3 and 7 months after PRK. In the remaining five eyes, central ablation power changed by more than 0.5 diopters (D) between the 6- and 12-month examinations. Regression was more common and more pronounced in eyes with intended corrections more than 5 D, whereas the majority of eyes with intended corrections of 5 D or less showed good correspondence between the final change in central ablation power and the attempted correction. Two eyes had a loss of at least two lines of best spectacle-corrected visual acuity that was attributable to irregular astigmatism, decentration of the ablation, and/or corneal opacification.