Mrochen Michael, Schelling Urs, Wuellner Christian, Donitzky Christof
Institute for Refractive and Ophthalmic Surgery, Swiss Federal Institute of Technology, Zurich, Switzerland.
J Cataract Refract Surg. 2009 Apr;35(4):738-46. doi: 10.1016/j.jcrs.2008.12.034.
To investigate the influence of temporal and spatial spot sequences on the ocular surface temperature increase during corneal laser surgery with a high-repetition-rate excimer laser.
Institute for Refractive and Ophthalmic Surgery, Zurich, Switzerland, and WaveLight AG, Erlangen, Germany.
An argon-fluoride excimer laser system working at a repetition rate of 1050 Hz was used to photoablate bovine corneas with various myopic, hyperopic, and phototherapeutic ablation profiles. The temporal distribution of ablation profiles was modified by 4 spot sequences: line, circumferential, random, and an optimized scan algorithm. The increase in ocular surface temperature was measured using an infrared camera.
The maximum and mean ocular surface temperature increases depended primarily on the spatial and temporal distribution of the spots during photoablation and the amount of refractive correction. The highest temperature increases were with the line and circumferential scan sequences. Significant lower temperature increases were found with the optimized and random scan algorithms.
High-repetition-rate excimer laser systems require spot sequences with optimized temporal and spatial spot distribution to minimize the increase in ocular surface temperature. An ocular surface temperature increase will always occur depending on the amount of refractive correction, the type of ablation profile, the radiant exposure, and the repetition rate of the laser system.
研究在使用高重复频率准分子激光进行角膜激光手术期间，时间和空间光斑序列对眼表温度升高的影响。
瑞士苏黎世屈光与眼科手术研究所以及德国埃尔朗根的威视公司。
使用一台重复频率为1050Hz的氩氟准分子激光系统，对具有各种近视、远视和光治疗性切削模式的牛角膜进行光切削。通过4种光斑序列改变切削模式的时间分布：直线、圆周、随机和一种优化扫描算法。使用红外摄像机测量眼表温度的升高。
眼表温度升高的最大值和平均值主要取决于光切削期间光斑的空间和时间分布以及屈光矫正量。直线和圆周扫描序列导致的温度升高最高。优化和随机扫描算法导致的温度升高显著较低。
高重复频率准分子激光系统需要具有优化的时间和空间光斑分布的光斑序列，以尽量减少眼表温度的升高。根据屈光矫正量、切削模式类型、辐射曝光量和激光系统的重复频率，眼表温度总是会升高。
