. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. Fig. 29—Position of rotary prism for producing diplopiain testing cyclophoria with prism placed at 8° base up. Darken the room and direct the patientsattention to the usual muscle-testing spot oflight, located approximately twenty feet awayand on a direct plane with the patients optical correction, if one is required,should always be left in place—just as in mak-ing other previously described muscle tests. [93] Refraction and Muscular Imbalance The rotary prism should then be brought be-fore the pa
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. Fig. 29—Position of rotary prism for producing diplopiain testing cyclophoria with prism placed at 8° base up. Darken the room and direct the patientsattention to the usual muscle-testing spot oflight, located approximately twenty feet awayand on a direct plane with the patients optical correction, if one is required,should always be left in place—just as in mak-ing other previously described muscle tests. [93] Refraction and Muscular Imbalance The rotary prism should then be brought be-fore the patients right eye with the handle-pointing upward and with zero graduationshorizontal. The indicator or red line shouldthen be rotated upward from zero to eightupon the prism scale, creating the equivalentof a prism of 8 diopters with base up (). This normally caused diplopia, althoughin some cases it may be necessary to place theprism at 10 or 12 degrees before diplopia
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