Vliv heteroforie na velikost fúzních rezerv do dálky a do blízka

Title in English The Effect of Heterophoria on the Size of Fusion Vergences in Far and Near
Authors

VESELÝ Petr BENEŠ Pavel SOKOLOVÁ ŠIDLOVÁ Jana ZÁDĚROVÁ Petra DOŠKOVÁ Hana

Year of publication 2023
Type Article in Periodical
Magazine / Source Česká a slovenská oftalmologie
MU Faculty or unit

Faculty of Medicine

Citation
Web zdroj
Keywords Heterophoria; fusion vergence; AC/A; Von Graefe method; Howell card; prism
Description Aims: We demonstrate changes in near and far fusional vergence measured with prism bars while compensating for the heterophoria present using current ametropia correction. Furthermore, determine the differences in the values of the AC/A ratio determined by the heterophoric (calculation) and gradient method. Material and methods: The basic sample includes 19 subjects with a mean age of 21.5 ±3.0 years (min. 18, max. 27). We used Von Graefe technique for examination of distance and near phoria and prism bars for examination of fusion vergences measured in prism diopters. We divided the basic set into six research sets according to the size of heterophoria in the distance and near. It was a set of patients with orthophoria to distance (D OR) and to near (B OR), a set of patients with exophoria to distance (D EX) and to near (B EX) and a set of patients with esophoria to distance (D ES) and to near (B ES). Results: In the case of both groups with exophoria (far, near) we found a statistically significant result only for negative fusion vergence (NFV). There was a statistically significant increase in NFV in sample with far and near exophoria (D EX, p = 0.01 and B EX, p = 0.02, respectively). In our study, we also demonstrated a statistically significant difference (p <0.001) in the values of the AC/A ratio measured by the gradient and heterophoric methods. The values determined by the gradient method are lower (3.0 ±1.1 pD/D versus 5.8 ±0.9 pD/D) than by the heterophoric method. Conclusion: By comparing the fusion vergence values in patients with exophoria and orthophoria, we demonstrated that in the presence of far or near exophoria, there is an increase in the ipsilateral fusion vergence. In the case of an increase in ipsilateral fusion vergence, the finding was statistically significant both far and near (p = 0.01 and p = 0.02, respectively). On the contrary, we were unable to prove this fact in the group of patients with esophoria. In our study, we also demonstrated a statistically significant difference (p <0.001) in the values of the AC/A ratio measured by the gradient and heterophoric methods. The values determined by the gradient method are lower (3.0 ±1.1 pD/D versus 5.8 ±0.9 pD/D) than by the heterophoric method.
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