Fine stereopsis is generated within what angular distance from the fovea?

Fine stereopsis is generated within what angular distance from the fovea?

• A. 5 degrees
• B. 10 degrees
• C. 15 degrees
• D. 20 degrees

Answer: (A)

Fine stereopsis relies on detecting tiny disparities with high spatial precision, which the fovea and immediate parafoveal region provide. The central retina has the smallest, most densely packed receptive fields and sharp binocular matching, so our depth judgments are most precise there. As you move away from the fovea, receptive fields widen and disparity sensitivity drops, making depth perception coarser. This precision window around the fovea ends up being about 5 degrees, so fine stereopsis is generated within roughly 5 degrees of the fovea.

Fine stereopsis relies on detecting tiny disparities with high spatial precision, which the fovea and immediate parafoveal region provide. The central retina has the smallest, most densely packed receptive fields and sharp binocular matching, so our depth judgments are most precise there. As you move away from the fovea, receptive fields widen and disparity sensitivity drops, making depth perception coarser. This precision window around the fovea ends up being about 5 degrees, so fine stereopsis is generated within roughly 5 degrees of the fovea.