Retinal sensitivity to damage from short wavelength light.
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Biomedical subjects
Publications and source records attributed to H A Mueller.
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Seven rhesus monkeys (14 eyes) were exposed to 1064-nanometer radiation in single pulses of 25 to 35 picoseconds fromn a mode-locked Nd: YA G laser. Threshold injury resulted from single pulses with a mnean energy of 13 +/- 3 mnicrojoules. Electron microscopy of the retina revealed that damnage was highly localized in the photoreceptor and pigmented epithelial cells at the oluter retina. Membrane disruption, distorted outer segmtzents, and abnormnal melanin granules resembling fetal premelanosomnies were observed.
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This is a case report of a 13-year-old boy with an osteoid-osteoma located in the pedicle of the third lumbar vertebra. The lesion could not be visualized on routine roentgenograms but with the use of technetium polyphosphate bone scan as a guide a suggestive bone lesion was found with tomograms. Histologic examination confirmed the diagnosis of osteoid-osteoma. This case illustrates the value of skeletal scanning in occult bone lesions.