Okamoto N, Harino S, Saito Y, Ogawa K
Eye Clinic, Osaka Teishin Hospital, Japan.
Nippon Ganka Gakkai Zasshi. 1993 Feb;97(2):196-200.
The authors measured reflected laser beams delivered by slit-lamp photocoagulator and binocular indirect ophthalmoscope laser delivery systems, to evaluate potential hazards to the eyes of bystanders. 514 nm laser beams were used; reflected laser beams were measured by a light power meter (Advantest: TQ8210). Reflected lasers were found to be hazardous at 1 meter from whitish tile when a 0.75 Watt laser beam was delivered by the binocular ophthalmoscope laser system, as in an operating room. At 1 meter from a wall in a photo-coagulating room for out-patients, the reflected laser beam was found to be well below hazardous levels. Reflections at 40 cm from a non-laser-coated Goldmann 3-mirror contact lens were 2.66 mW/cm2, which exceeds the exposure limits, when 0.3 W laser was delivered by the slit-lamp photocoagulator. This decreased 85-90% when the laser was reflected from a laser-coated lens. From the point of view of safety, it is recommended that laser surgeons replace non-laser-coated lenses with laser-coated ones.
作者测量了裂隙灯光凝器和双目间接检眼镜激光传输系统发出的反射激光束，以评估对旁观者眼睛的潜在危害。使用的是514纳米激光束；反射激光束由光功率计（爱德万斯特：TQ8210）测量。结果发现，当双目检眼镜激光系统发出0.75瓦激光束时，如在手术室中，在距离白色瓷砖1米处的反射激光具有危险性。在门诊光凝室距离墙壁1米处，反射激光束被发现远低于危险水平。当裂隙灯光凝器发出0.3瓦激光时，距未涂激光的戈德曼三面接触镜40厘米处的反射光为2.66毫瓦/平方厘米，超过了暴露极限。当激光从涂有激光的镜片反射时，这一数值降低了85 - 90%。从安全角度考虑，建议激光外科医生用涂有激光的镜片替换未涂激光的镜片。
