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Laser-induced retinal damage threshold measurements with wavefront correction.

Brian J Lund1, David J Lund, Peter R Esdall

  • 1Northrop Grumman, 4241 Woodcock Drive, Suite B100, San Antonio, Texas 78228, USA. brian.lund@ctr.brooks.af.mil

Journal of Biomedical Optics
|January 7, 2009
PubMed
Summary

Adaptive optics corrected laser eye exposure measurements in nonhuman primates. This resulted in significantly lower ED(50) values, bringing in vivo results closer to in vitro predictions for retinal laser safety.

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Area of Science:

  • Ophthalmology
  • Biomedical Optics
  • Laser Safety

Background:

  • Ocular aberrations can affect laser retinal exposure thresholds.
  • Previous in vivo measurements may not accurately reflect true retinal sensitivity due to uncorrected aberrations.

Purpose of the Study:

  • To measure the in vivo retinal ED(50) in nonhuman primate eyes using an adaptive optics system.
  • To assess the impact of aberration correction on laser exposure thresholds.
  • To compare in vivo and in vitro retinal laser exposure data.

Main Methods:

  • Incorporated an adaptive optics (AO) system into a laser retinal exposure setup.
  • Measured ED(50) for 100-ms and 3.5-ns, 532-nm laser exposures in nonhuman primate eyes.
  • Corrected for refractive error and higher-order aberrations.

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Main Results:

  • ED(50) for 100-ms exposure reduced by 22% with AO correction.
  • ED(50) for 3.5-ns exposure reduced by 37% with AO correction, reaching 0.51 microJ TIE.
  • The 3.5-ns ED(50) is the lowest reported for ns-duration exposure and close to the maximum permissible exposure (MPE).

Conclusions:

  • Adaptive optics significantly improves the accuracy of in vivo laser retinal exposure measurements.
  • Correcting for ocular aberrations brings in vivo ED(50) values closer to in vitro findings.
  • Further investigation is needed to fully reconcile in vivo and in vitro data for laser safety standards.