Ophthalmologists are frequently called in consultation to see patients that are bedridden, and it is difficult to determine the extent of that patient's visual acuity unless some special equipment is carried along for the purpose. Since vision is the primary reason for eyes in the first place, it is essential in every eye examination that an estimation of the visual efficiency be made.
In an attempt to provide a solution to the problem, the following simple device is offered. It consists of a reduced A. M. A. vision chart calculated to be read at 24 in., placed on the ophthalmoscope handle, and held in position by a transparent plastic sleeve. The chart then becomes a permanent part of the ophthalmoscope and provides an easily transported convenient method of determining vision.
Recording of the results of this test can be made by the same basic method as is used for vision
WOOD EH. Vision Chart for the Ophthalmoscope. AMA Arch Ophthalmol. 1957;58(5):752-753. doi:10.1001/archopht.1957.00940010774016