ABSTRACT
ABSTRACT: Objective: to evaluate, in A-and V-Patterns, the possible influence of vertical shift of horizontal recti insertions, associated to recession, on the deviation amount in primary position. Materials and Methods: 41 concomitant exodeviations and 40 EIE (both pure and presenting with A-V pattern) were examined. In order to evaluate the efficacy of the recession, the PD/mm ratio (the amount of Prismatic diopters corrected by 1 mm of recession) has been considered. Results: Concerning the exodeviations, in the pure recession the PD/mm is 1.33(0.72) at distance and 1.33(0.87) at near fixation; in vertical shift 1.37(0.65) and 1.46(0.8). About the pure recession in the EIE, the PD/mm is 1.68(1.1) for far and 2.2(1.21) for near distance, as in vertical shift 2.16(1.01) and 2.28(0.85) respectively. Conclusions: A significative difference between the two kinds of surgery could not be detected, but vertical shift in EIE shows a trend to increase the recession power.
