Prisms Their Use And Equivalents

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Cyclo-duction, the intrinsic power of each oblique muscle or of both superior or of both inferior obliques may also be measured.
Savage's Monocular Phorometer (Fig. 108). This instrument is designed for the determination and measurement of insufficiencies of the various ocular muscles and is based on the principle that the image in one eye throughout every test shall be undisturbed.
It consists principally of a rotary variable prism correctly marked in degrees and lettered to show the various c
...onditions of muscular imbalance, such as exophoria, esophoria, hyperphoria, etc. On each side 106 PRISMS of the rotary prism are cells, in one of which, toward the patient's face, is to be placed the displacing prism for causing diplopia. These prisms are carefully mounted in square cells for securing accurate position at either 90 degrees or 180 degrees. The instrument is supplied with a spirit-level and a leveling-screw.
FIG. 108. Savage's monocular phorometer.
The prism is reversible for either eye.


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