[Subject] To acquire a prism prescription value necessary for correcting fixation disparity by means of a spectacle lens in a simple, quick, and accurate manner.[Solution] To provide a prism prescription value acquisition system comprising a calculation part for numerically transforming a fixation disparity amount (unit: angle), which indicates a degree at which the visual axis is shifted from the central fovea of the retina when a subject conducts visual fixation of a target, into a prism prescription value by multiplying the fixation disparity amount by a coefficient when the fixation disparity amount is within ±4 minutes.Herein, the prism prescription value is calculated according to the following equation: APver=kver*FDverAPhor=khor*FDhor providing that each of coefficients khor and kver satisfies the following conditions:0.3 ≤ kver ≤ 0.71.4 ≤ khor ≤ 2. 0
