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There is some difficulty in making an exact ophthalmoscopic examination in a light or lighted hospital ward or in a home. The media and fine changes in the retina can be seen very much better in a dark room. As it is not always practical to move patients to such a room, the device illustrated is offered.
It consists of a lady's very short-handled, ordinary, opaque black umbrella. An excellent quality black sateen curtain, one yard wide, is attached by means of snaps to the umbrella circumference, with an overlap of several inches. The opening can be thrown open, more or less, as desired. This curtain is detachable but is best left in place. When the umbrella is opened a dark tent becomes available, which is placed over the patient. The umbrella handle may be held by the patient or by a nurse. The examiner must have
Olsho SL. PORTABLE DARK ROOM FOR USE IN THE WARD AND HOME. JAMA. 1936;106(2):115. doi:10.1001/jama.1936.92770020002009a
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