November 1992
Volume 33, Issue 12
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Articles  |   November 1992
Morphologic comparisons between rhodopsin-mediated and short-wavelength classes of retinal light damage.
Author Affiliations
  • L M Rapp
    Cullen Eye Institute, Baylor College of Medicine, Houston, Texas 77030.
  • S C Smith
    Cullen Eye Institute, Baylor College of Medicine, Houston, Texas 77030.
Investigative Ophthalmology & Visual Science November 1992, Vol.33, 3367-3377. doi:
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      L M Rapp, S C Smith; Morphologic comparisons between rhodopsin-mediated and short-wavelength classes of retinal light damage.. Invest. Ophthalmol. Vis. Sci. 1992;33(12):3367-3377.

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Abstract

The histologic manifestations of rhodopsin-mediated versus short-wavelength classes of retinal phototoxicity were compared after spectral exposures of the albino rat retina. Animals were exposed to wave-bands of light centered at the peak of rhodopsin absorbance (green, 500 nm) or in the ultraviolet A (UVA; 360 nm). Intensity-damage curves generated for each wave-band indicated that UVA light was 50-80 times more effective than green light at causing photoreceptor cell losses. Examination of early ultrastructural changes in rod inner segments, outer segments, and retinal pigment epithelium revealed a remarkable degree of similarity between UVA and green light-induced damage. Furthermore, the two classes of damage were indistinguishable in terms of post-exposure recovery from threshold damage and regional distribution of photoreceptor cell loss along the vertical meridian. The finding of essentially identical histologic manifestations for the two classes of damage raises the possibility that they share a common biochemical etiology or pathway of cell destruction.

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