The Effect of Heterophoria on the Size of Distance and Near Fusion Vergence.

Aims: To demonstrate changes in distance and near fusional vergence measured with prism bars, while compensating for present heterophoria using current ametropia correction. In addition, to determine the differences in values of the AC/A ratio determined by the heterophoric (calculation) and gradient methods.

Material And Methods: The basic sample includes 19 subjects with a mean age of 21.