Mehta Jodhbir S, Shilbayeh Rania, Por Yong-Ming, Cajucom-Uy Howard, Beuerman Roger W, Tan Donald T
Singapore National Eye Centre, Singapore.
J Cataract Refract Surg. 2008 Nov;34(11):1970-5. doi: 10.1016/j.jcrs.2008.07.028.
To evaluate the accuracy of the thickness and diameter of corneal disks obtained with the Femtec femtosecond laser (20/10 Perfect Vision) for Descemet-stripping endothelial keratoplasty (DSEK).
Singapore National Eye Centre, Singapore.
A femtosecond laser was used to create posterior stromal ablations at varying depths, producing donor lenticules 150 to 200 microm thick with diameters of 7.0 to 9.5 mm (n = 40). After stromal ablation, the central corneal thickness was measured by anterior segment optical coherence tomography and the diameters were measured using imaging software.
The mean deviation from the attempted thickness was 15 +/- 14 microm. No correlation was found between the preoperative corneal thickness and the accuracy of the laser ablation (P = .91). No statistically significant differences were found in the accuracy of the laser ablation with multiple-pass nomograms (P = .15). The laser was accurate in producing circular diameters with an arc length between 7.0 mm and 9.5 mm (r2 = 0.935, P = .001).
The femtosecond laser produced posterior stromal ablations that were accurate in depth of ablation and circularity.
评估使用Femtec飞秒激光（20/10完美视力）获取用于后弹力层剥除内皮角膜移植术（DSEK）的角膜盘厚度和直径的准确性。
新加坡国立眼科中心，新加坡。
使用飞秒激光在不同深度进行基质后表面消融，制作出厚度为150至200微米、直径为7.0至9.5毫米的供体透镜（n = 40）。基质消融后，通过眼前节光学相干断层扫描测量中央角膜厚度，并使用成像软件测量直径。
与预期厚度的平均偏差为15±14微米。术前角膜厚度与激光消融准确性之间未发现相关性（P = 0.91）。多次扫描列线图的激光消融准确性未发现统计学上的显著差异（P = 0.15）。该激光在产生弧长为7.0毫米至9.5毫米的圆形直径方面准确（r2 = 0.935，P = 0.001）。
飞秒激光产生的基质后表面消融在消融深度和圆形度方面是准确的。
