Stereo perimetry reveals a foveal impairment of stereopsis in amblyopia.



Amblyopia is associated with suppression in the central visual field. It has been proposed that in cases of anisometropia or small misalignment, there may be peripheral fusion that can serve as the basis for stereopsis (Siretanu & Fronius, 1981; Harrad, 1996). Here, we used a novel stereo perimetry method to test this conjecture.

We measured stereopsis in the fovea and the periphery using a method analogous to perimetry. The observer maintained gaze at a fixation point, while keeping nonius lines aligned, and detected whether a target was presented in front of or behind the fixation plane. The