Relation between accommodation and convergence by accommodation (AC/A) with the gradient method in a small population group of Pereira

Abstract

The purpose of this study was to determine the average value of the relation AC/A estimated with the gradient method in a small population group of Pereira and to establish the most appropriate stimulus lens to calculate such synergy. <em><strong>Methods:</strong></em> 66 people were evaluated between 16 and 30 years old who had the following examination: inter pupilary distance, visual acuity, heterophories, near vision, far vision, induced phories, and AC/A gradient. <em><strong>Results:</strong></em> an AC/A gradient of 1:3,12 (SD =1.30) was obtained; with an stimulus lens of +1.00, 1:3,41 (SD = 1,59), -1.00 D 1:2,82 (SD = 1,45), -2.00 D, 1:3,11 (SD =1,27), y -3.00 D, 1:3,18 (SD =1,27). The best correlation was obtained with lenses -2.00 and -3.00 D (SD =0.76) and the worst with lenses +1.00 and -1.00 D (SD =0.15). Conclusions: the relation AC/A gradient was lower than the reported in literature and there was a significant variability when it was measured with different stimulus lenses.