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Thresholds for retinal vitreal and contained hemorrhages were determined for 1064 nm laser light at 30-nsec and 4-nsec 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 punctate centers. The vitreal hemorrhage was characterized by the presence of choroidal blood in the vitreal chamber at the exposure site. The 30-nsec contained hemorrhage threshold (ED50) was 1.7 mJ on the macula and 2.1 mJ for an extramacular exposure. The 30-nsec vitreal hemorrhage macular threshold was 2.3 mJ, and the extramacular threshold was 6.6 mJ. The threshold for the 4-nsec pulsewidths to produce a hemorrhage (vitreal or contained) on the retina (macula or extramacular) was 340 microJ.
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
January 1985,
Archives of ophthalmology (Chicago, Ill. : 1960),
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
September 1984,
Ophthalmology,
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
August 1984,
Archives of ophthalmology (Chicago, Ill. : 1960),
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
January 1986,
Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie,
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
January 1985,
Transactions of the ophthalmological societies of the United Kingdom,
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
March 1985,
Ophthalmology,
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
June 1985,
Ophthalmology,
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
September 1983,
American journal of ophthalmology,
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
June 1985,
Archives of ophthalmology (Chicago, Ill. : 1960),
M F Blankenstein, and
J Zuclich, and
R G Allen, and
H Davis, and
S J Thomas, and
R F Harrison
January 1986,
Archives of ophthalmology (Chicago, Ill. : 1960),
