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Related Experiment Videos

Colour contrast sensitivity changes caused by peripheral retinal laser photocoagulation.

C R Canning1, N Strong, T A Berninger

  • 1Moorfields Eye Hospital, London, England.

Eye (London, England)
|January 1, 1991
PubMed
Summary

Blue-green lasers used for peripheral retinal treatment can cause temporary acute macular phototoxicity, affecting tritan axis color vision. Longer wavelengths did not show this effect.

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Area of Science:

  • Ophthalmology
  • Laser Medicine
  • Retinal Imaging

Background:

  • Macular phototoxicity is a known risk associated with laser use.
  • The wavelength of light is suspected to influence the severity of phototoxicity.
  • Assessing immediate macular effects after laser treatment is crucial for patient safety.

Purpose of the Study:

  • To evaluate the immediate macular effects of laser photocoagulation for peripheral retinal holes.
  • To determine if laser wavelength influences acute macular phototoxicity.
  • To assess changes in color contrast sensitivity post-treatment.

Main Methods:

  • A computer-based color contrast sensitivity test was employed.
  • 17 patients with normal retinas underwent photocoagulation of peripheral flat retinal holes.

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  • Blue-green (488/514 nm), yellow (577 nm), orange (595 nm), and red (647 nm) lasers were used.
  • The laser aiming beam avoided macular traversal.

    • Main Results:

    • No protan or deutan axis threshold changes were observed across all tested wavelengths.
    • A significant reduction in tritan axis sensitivity was noted one hour after blue-green laser treatment.
    • No tritan axis changes occurred with yellow, orange, or red laser treatments.
    • The observed tritan axis sensitivity reduction resolved by the following day.

    Conclusions:

    • Peripheral retinal treatment with blue-green laser can induce acute macular phototoxicity.
    • Blue-green laser light appears to be more implicated in macular phototoxicity than longer wavelengths.
    • Short-term tritan axis color vision deficits may occur after blue-green laser treatment.