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September 1953


Author Affiliations

From the Department of Anatomy, Western Reserve University School of Medicine.

AMA Arch Ophthalmol. 1953;50(3):346-351. doi:10.1001/archopht.1953.00920030353014

SINCE 1940, the blood flowing through the human bulbar conjunctiva has been used as an indicator to detect systemic changes in its mechanical composition. It had been found that in many diseases red blood cells were stuck together to form aggregates.1 These red cell aggregates usually resisted passage through small blood vessels which measured less than 50 μ in diameter. The red cell aggregates varied in size, shape, plasticity, and elasticity. Cinephotographic recording was necessary to illustrate the rapid changes which occurred in the physical properties of the aggregates as they were forced through the small blood vessels. Color cinephotography was desired, since the film has a small grain and greater contrast could be obtained, the subject being red against a white background.

STATEMENT OF THE PROBLEM  The design of the camera was influenced by (1) the subject, (2) the intensity of the light, and (3) the necessity for

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