Biomedical subjects
Publications and source records attributed to E Q Yavitz.
A 71-year-old man had bilateral shallow retinal detachments. An extensive medical work-up was unrevealing. A "skinny-needle" biopsy of retrocrural lymph nodes under computed tomographic control supported a diagnosis of metastatic adenocarcinoma to his choroid. A review of the literature on metastatic ocular cancer is presented.
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Radial keratotomy is an experimental surgical procedure being performed in increasingly large numbers, often without carefully designed protocols which meet accepted methodology for clinical research. This paper presents an instrumentation system which makes it possible to have precise control of the length, depth, and spacing of radial keratotomy incisions. This is not a paper in favor of radial keratotomy. It raises the need for rigid standardization of the technique with evaluation of the results according to carefully controlled and accepted clinical trial methodology.
The half-tone display of the Octopus perimeter utilizes circles and squares of various sizes as symbols for static threshold levels of light sensitivity in localized areas of the visual field. Under normal lighting conditions at a normal reading distance the symbols do not blur into shades of gray, thus limiting the clinician's ability to screen quickly for contour abnormalities. Four methods that enhance contour discrimination of the half-tone display are (1) viewing at a distance, (2) viewing in dim light, and using either a (3) -14 diopter or (4) +20 diopter lens. In a survey conducted to determine ophthalmologists's preferences, all methods were ranked superior to viewing under normal conditions of lighting and reading distance.
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