Retinal-hemorrhage thresholds for Q-switched neodymium-YAG laser exposures
Technical Report
·
OSTI ID:6984803
Thresholds for retinal vitreal and contained hemorrhages were determined for 1064-nm laser light at 30-ns and 4-ns pulsewidths. Rhesus monkeys received graded exposures from a neodymium-YAG laser onto either the macular or extramacular region of the retina. Contained hemorrhages appeared as concentric-ring structures with white punctuate centers. The vitreal hemorrhage was characterized by the presence of choroidal blood in the vitreal chamber at the exposure site. The 30-ns contained-hemorrhage threshold (ED50) was 1.7 mJ on the macula and 2.1 mJ for an extramacular exposure. The 30-ns vitreal-hemorrhage macular threshold was 2.3 mJ, and the extramacular threshold was 6.6 Mj. The threshold for the 4-ns pulse widths to produce a hemorrhage (vitreal or contained) on the retina (macula or extramacular) was 340 uJ.
- Research Organization:
- Technology, Inc., San Antonio, TX (USA). Life Sciences Div.
- OSTI ID:
- 6984803
- Report Number(s):
- AD-A-171977/2/XAB
- Country of Publication:
- United States
- Language:
- English
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560400* -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BODY
BODY AREAS
ELECTROMAGNETIC RADIATION
EYES
FACE
HEAD
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INFRARED RADIATION
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NEAR INFRARED RADIATION
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ORGANS
PATHOLOGICAL CHANGES
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BODY
BODY AREAS
ELECTROMAGNETIC RADIATION
EYES
FACE
HEAD
HEMORRHAGE
INFRARED RADIATION
LASERS
MAMMALS
MONKEYS
NEAR INFRARED RADIATION
NEODYMIUM LASERS
ORGANS
PATHOLOGICAL CHANGES
PRIMATES
RADIATION EFFECTS
RADIATIONS
RETINA
SENSE ORGANS
SOLID STATE LASERS
SYMPTOMS
VERTEBRATES