Stereoscopic Acuity and Retinal Eccentricity

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Abstract
Stereoacuity was measured at various angles from the fovea along horizontal, oblique and vertical meridians. The acuity falls with eccentricity in a nonlinear fashion, and there is a significantly higher acuity everywhere along the horizontal and oblique meridians than along the vertical meridian. This is interpreted as a result of the bi-hemispherical stereoscopy probably characterizing the vertical judgements, and argues against the concept of dual foveal representation which is sometimes used to explain macular sparing.

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