An Experimental Investigation of the Effect of 1.06 micrometers Laser Light on the Transparent Ocular Media.
Annual rept. 1 Apr 75-29 Feb 76,
TECHNOLOGY INC SAN ANTONIO TEX LIFE SCIENCES DIV
Pagination or Media Count:
The effect of 1.06 micrometers light on the clear ocular media of rabbit eyes was investigated. A Q-switched NdYAG laser operating in the TEM sub oo mode was used to irradiate the eyes with 100 msec trains of 300 to 700 nsec pulses at 1 KHz repetition rate. A clouding of the ocular media was observed within 24 hours for multiple exposures with energy levels near retinal damage threshold. The latency for the appearance of the clouding ranged from less than an hour for total doses of 50X retinal damage thresholds to approximately 24 hours for total dose of 2X retinal thresholds. A theoretical study of Mie scattering for known cell and other particle sizes of the ocular media is described in the report. The major findings from slit lamp examinations of the exposed eyes is also described. The slit lamp examinations revealed changes in the lens following exposures that took up to one week to develop. The changes were manifest as an increased scatter from the central third of the lenses. Author