Laser induced bubble formation in the retina

Bernard S. Gerstman, Charles R. Thompson, Steven Jacques, Mark E. Rogers

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Background and Objective: The immediate thermodynamic effects of absorption of a laser pulse in the retina are theoretically studied to understand underlying physical damage mechanisms at threshold fluences. Damage is most likely to occur at threshold levels in the retinal pigment epithelium due to the strong absorption by the melanosomes. Methods: The retinal pigment epithelium is modeled as an aqueous environment with absorption occurring at small spherical sites with absorption coefficients representative of melanosomes. For laser pulse durations of less than 10-6 seconds, heat conduction is negligible during energy deposition and the resulting large energy density in the melanosomes will cause vaporization of the medium immediately surrounding a melanosome. Results: We developed expressions for calculating the size of bubbles produced as a function of pulse characteristics and melanosome properties. We show that for pulse durations between 10-6 and 10-9 seconds, bubble formation will occur for laser fluences that are smaller than those required to cause Arrhenius-type thermal damage. Conclusion: Bubble formation is likely to be the mechanism of threshold damage to the retina for laser pulses durations in the time regime between 10-6 and 10-9 seconds.

Original languageEnglish (US)
Pages (from-to)10-21
Number of pages12
JournalLasers in Surgery and Medicine
Volume18
Issue number1
DOIs
StatePublished - 1996
Externally publishedYes

Fingerprint

Melanosomes
Retina
Lasers
Retinal Pigment Epithelium
Hot Temperature
Volatilization
Thermodynamics

Keywords

  • Arrhenius
  • bubble
  • damage
  • ED
  • fluence
  • laser
  • minimal visible lesion
  • retina
  • thermal damage
  • threshold
  • vaporization

ASJC Scopus subject areas

  • Surgery

Cite this

Laser induced bubble formation in the retina. / Gerstman, Bernard S.; Thompson, Charles R.; Jacques, Steven; Rogers, Mark E.

In: Lasers in Surgery and Medicine, Vol. 18, No. 1, 1996, p. 10-21.

Research output: Contribution to journalArticle

Gerstman, Bernard S. ; Thompson, Charles R. ; Jacques, Steven ; Rogers, Mark E. / Laser induced bubble formation in the retina. In: Lasers in Surgery and Medicine. 1996 ; Vol. 18, No. 1. pp. 10-21.
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