July 1986
Volume 27, Issue 7
Articles  |   July 1986
Retinal hemorrhage thresholds for Q-switched neodymium-Yag laser exposures.
Investigative Ophthalmology & Visual Science July 1986, Vol.27, 1176-1179. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      M F Blankenstein, J Zuclich, R G Allen, H Davis, S J Thomas, R F Harrison; Retinal hemorrhage thresholds for Q-switched neodymium-Yag laser exposures.. Invest. Ophthalmol. Vis. Sci. 1986;27(7):1176-1179.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

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.


This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.