physiological exophoria

exophoria, physiological

The relative exophoria at near, when the heterophoria in near vision is compared to the heterophoria in distance vision. It is, on average, of the order of 3-4 D at a fixation distance of 40 cm. Example: if distance heterophoria is 6 D eso and near heterophoria is 2 D eso, the physiological exophoria is 4 D exo.
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