van Saarloos P P, Constable I J
Lions Eye Institute, Nedlands, Western Australia.
Lasers Surg Med. 1993;13(2):189-96. doi: 10.1002/lsm.1900130206.
An improved 193 nm excimer laser photorefractive keratectomy system is described here. The delivery system was optimised to produce a smooth keratectomy bed, to minimise the healing response, and to reduce the regression of the refractive result. A spatial filtering system was used to smooth the energy distribution within each pulse, and the iris was adjusted for every pulse, to eliminate steps and other irregularities from the keratectomy profile. An image rotator was used to average out any remaining non-uniformities in the energy distribution. The results from the first 39 eyes treated with this laser system with a maximum follow-up of 18 months, are summarised. No epithelial healing problems were noticed, and little or no loss of corneal clarity was noted at any stage during healing. Twenty of the keratectomy procedures were normally sighted myopic corrections, with a maximum follow-up of 5 months. Minimal regression of the refractive correction was seen during the first 8 weeks.
本文描述了一种改进的193纳米准分子激光屈光性角膜切除术系统。该输送系统经过优化，以产生光滑的角膜切除床，将愈合反应降至最低，并减少屈光结果的回退。使用空间滤波系统来平滑每个脉冲内的能量分布，并且针对每个脉冲调整虹膜，以消除角膜切除轮廓中的台阶和其他不规则之处。使用图像旋转器来平均能量分布中任何剩余的不均匀性。总结了使用该激光系统治疗的前39只眼睛的结果，最大随访时间为18个月。未发现上皮愈合问题，并且在愈合过程中的任何阶段均未观察到角膜透明度有很少或没有损失。其中20例角膜切除手术为正视近视矫正，最大随访时间为5个月。在最初的8周内，屈光矫正的回退最小。
