Förster W, Beck R, Busse H
University Eye Hospital Münster, F.R.G.
Refract Corneal Surg. 1993 Jul-Aug;9(4):293-9.
The 193-nanometer excimer laser is used for photoablative reprofiling of the cornea to correct refraction errors and to treat corneal pathologies. To use the unique properties of the excimer laser, some technical features should be provided by the excimer laser system. A new excimer laser system is presented.
The instrument has a fluence sensor for precise measurement of the actual fluence just before surgery, a new delivery system including an integrator system to homogenize the laser beam, a steelband with apertures and a zoom optic to get the desired form of central reprofiling, and an alignment system to reduce the possibility to decenter the optical zone.
The fluence before surgery can be measured very precisely with the fluence sensor. The ablation zone size is at least 8 mm in diameter with a homogenous laser beam profile resulting in a smooth surface of the treated material. Different forms of ablations can be created using the steelband with different forms of apertures. The center of the ablation zone can be found using the alignment system.
The new excimer laser system fulfills some important technical features for optimal use of the excimer laser in corneal surgery.
193纳米准分子激光用于角膜的光蚀重塑，以矫正屈光不正和治疗角膜病变。为利用准分子激光的独特特性，准分子激光系统应具备一些技术特征。本文介绍一种新型准分子激光系统。
该仪器有一个用于在手术前精确测量实际能量密度的能量密度传感器、一个新的输送系统，包括一个使激光束均匀化的积分器系统、一个带孔的钢带和一个变焦光学器件以获得所需的中央重塑形状，以及一个对准系统以降低光学区偏心的可能性。
使用能量密度传感器可非常精确地测量手术前的能量密度。消融区直径至少为8毫米，激光束轮廓均匀，使处理后的材料表面光滑。使用带有不同孔形式的钢带可产生不同形式的消融。利用对准系统可找到消融区的中心。
新型准分子激光系统具备一些重要技术特征，可在角膜手术中最佳地利用准分子激光。
