. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. Method—Use of Prismsfor Constant Wear to effect treatment. Prisms 1st. Where a case cannot be reducedthrough use of first two methods, as for exam-ple in a case of 6° of exophoria, prescribe 1/4of amount of imbalance (>4 >4°) foreach eye—base in—or esophoria base out, hy-perphoria base up on eye affected. 2nd. Advise patient to call every threemonths and make duction test (Fig. 24).If no improvement in condition, after wearingprisms six months, operative means is suggest-ed. Assume a case is benefite
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. Method—Use of Prismsfor Constant Wear to effect treatment. Prisms 1st. Where a case cannot be reducedthrough use of first two methods, as for exam-ple in a case of 6° of exophoria, prescribe 1/4of amount of imbalance (>4 >4°) foreach eye—base in—or esophoria base out, hy-perphoria base up on eye affected. 2nd. Advise patient to call every threemonths and make duction test (Fig. 24).If no improvement in condition, after wearingprisms six months, operative means is suggest-ed. Assume a case is benefited, reduce prismpower according to rule; J/4D prism for eachdegree of imbalance. CyclophoriaThis work being of a technical nature, it isdeemed best for the reader to study ChapterXIII and XIV. [92] Chapter XIII CYCLOPHORIAMade with Maddox Rods and Rotary Prisms /^YCLOPHORIA, a condition affectingthe oblique muscles of the eye, is causedby its rotation. It is detected in the followingmanner by the combined use of the red andwhite Maddox rods and the rotary 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 isproduced.
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