Anterior eye tissue transmission for the radiation with thewavelength from eye safe region

Abstract

Comparison of the eye tissue transmission for six laser radiations from visible up to mid- infrared region was done. The attenuation of the alexandrite (visible 0.75 μm), and Nd:YAP (near infrared 1.08 μm) laser radiations was found to be minimal – a retina reachs ∼46% energy of these lasers entering the eye. On the other side the radiations of 1.54 μm (Er:glass), 1.66 μm (Er:YAP), and 2.01 μm (Tm:YAG) lasers are absorbed by the anterior segments of the eye and no impact is appeared on the retina. The absorption values measured for 1.34 μm (Nd:YAP) was recorded to be between the curves obtained for two groups of radiation wavelengths mentioned above. On retina, only 0.5% of the cornea radiation level was found. In this case the anterior parts of the eye are affected partially but not so deeply as in the case of eye safe radiation application.