In taking central fields with a Bjerrum screen it has seemed desirable to use a chin rest. This not only makes the patient more comfortable but insures better fixation of the central fixation target.
The use of an ophthalmic instrument table with a clamped-on chin rest, such as can be purchased from a manufacturer of optical instruments, has proved to be satisfactory. It was my desire, however, to make a less bulky and less expensive chin rest for use in the office. Practically any floor lamp stand with a thumbscrew adjustment, as illustrated here, may be used. The flexible tubing with the lighting fixture is removed. The movable tubular shaft may be replaced with an iron bar, as I have done, or it may be used as it is. The chin rest piece 1 is then attached to the rod shaft by grinding the shaft down at one end to
Ravin LC. A SIMPLE AND INEXPENSIVE CHIN REST FOR USE WITH A TANGENT SCREEN. Arch Ophthalmol. 1940;23(4):839–840. doi:10.1001/archopht.1940.00860130933012
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