Comparison of the dose-response relationship of retinal damage induced by Q-switched (Q-sw) Nd:YAG lasers was conducted for rabbits and monkeys. Experimental results indicated that the two probit regression lines were parallel to each other, and the damage threshold (ED50) ratio was approximately 1:3.57. Observations of the injurious effects of Q-sw Nd:YAG rangefinders--the total energy level being about 10-100 mJ--and their injurious distances are reported in this paper. A brief description is given of coagulative and hemorrhagic pathological changes under different exposure conditions and at various distances.
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