Ludwig K, Lasser T, Sakowski H, Abramowski H, Wörz G
Augenklinik, Universität München.
Ophthalmologe. 1994 Dec;91(6):783-8.
The impact of wavelength upon the laser power required in photocoagulation of oedematous and non-oedematous retinal areas was investigated in a restricted clinical study. The following laser systems were applied: an argon laser (514 nm), a diode-pumped frequency-doubled Nd:YAG laser (532 nm) and a diode laser (810 nm). All lasers had broadly similar properties as regards beam characteristics, beam conduction and application optics. Twenty-five eyes of 25 patients with diabetic retinopathy were included in the study. Each eye was treated with each laser in areas of edema and no edema. Apart from the wavelength, laser power was the only variable permitted. The power required for photocoagulation at 514 nm and 532 nm was identical under every aspect of the study. In comparison with 514 nm or 532 nm photocoagulations, 810 nm photocoagulations required 6.0 +/- 0.9-fold higher power settings in nonedematous retina and 5.75 +/- 1.0 fold higher power settings in edematous retina. At every wavelength investigated, retinal edema raised the average laser power needed by more than 20%. The extent of this effect seems to decline with longer wavelengths.
在一项有限的临床研究中，研究了波长对水肿和非水肿视网膜区域光凝所需激光功率的影响。应用了以下激光系统：氩激光（514纳米）、二极管泵浦倍频Nd:YAG激光（532纳米）和二极管激光（810纳米）。就光束特性、光束传导和应用光学而言，所有激光具有大致相似的特性。25例糖尿病视网膜病变患者的25只眼睛纳入了研究。每只眼睛在水肿和非水肿区域均用每种激光进行治疗。除波长外，激光功率是唯一允许变化的因素。在研究的各个方面，514纳米和532纳米光凝所需的功率相同。与514纳米或532纳米光凝相比，810纳米光凝在非水肿视网膜中所需的功率设置高6.0±0.9倍，在水肿视网膜中所需的功率设置高5.75±1.0倍。在所研究的每个波长下，视网膜水肿使所需的平均激光功率提高了20%以上。这种效应的程度似乎随着波长的延长而下降。
