4/1/19 (3 months later) assuming abduction has increased from 2° to 3° showing difference of 5 Es. or 0.25 × 5. equals +1.25 added to optical correction, prescribed treatment lenses equal:
+2.25 = -1. × 180.
7/1/19 (3 months later), assuming abduction has increased from 3° to 4° showing difference of 4° Es. or 0.25 × 4 equals +1.00 which added to optical correction would make prescribed treatment lenses equal:
+2.00 = -1. × 180.
And so on, every three months treatment lenses are prescribed until both right and left eye show 8° of abduction. In this way the treatment lenses are reduced to original correction of +1.00 = -100 × 180. This would have required six changes of lenses, three months apart—thus consuming 18 months time.
Chapter X
SECOND METHOD OF TREATMENT—
MUSCULAR EXERCISE
Made With Two Rotary Prisms
and Red Maddox Rod
Exophoria
If a case is one of exophoria of six degrees, where the second method of treatment or muscular exercise is in line of routine, it is essential to first determine through a duction test and the preparation of the diagram exactly which one of the four muscles are faulty ([Fig. 24]).