Accession Number : AD0670864

Title :   EFFECT OF RUBY LASER ENERGY ON THE HUMAN IRIS.

Descriptive Note : Rept. for Feb-Nov 67,

Corporate Author : PASADENA FOUNDATION FOR MEDICAL RESEARCH CALIF LASER BIOLOGY LAB

Personal Author(s) : Rounds,Donald E. ; Olson,Robert S. ; Irvine,A. Ray , Jr

Report Date : MAR 1968

Pagination or Media Count : 13

Abstract : Excised rings of iridial sphincter muscle taken from recently enucleated human eyes were monitored for their contractile and tearing response after treatment with varying photon densities from a pulsed ruby laser. The response was linear between 0 to 26 J/sq cm. but variable above that energy density level. A comparison of this response with that of rings of hamster dorsal aorta suggested that the variability was due to iridial tissue damage. This hypothesis was supported with observations that the iris showed variable degrees of destruction after the sectioning of intact eyes exposed to a laser dose range between 28 and 2200 J/sq cm. These methods suggested that the threshold of ruby laser energy which would impair the functional activity of the iris was approximately ten times the damage threshold level for the human retina. Additional work was called for to evaluate the effect of iridial damage on visual acuity. (Author)

Descriptors :   (*LASERS, *BURNS(INJURIES)), (*EYE, RADIATION INJURIES), RUBY, PHOTONS, PATHOLOGY, THRESHOLDS(PHYSIOLOGY), OPHTHALMOLOGY

Subject Categories : Medicine and Medical Research
      Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE