[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: AP ver = k ver * FD ver AP hor = k hor * FD hor providing that each of coefficients k hor and k ver satisfies the following conditions: 0.3 ‰¤ k ver ‰¤ 0.7 1.4 ‰¤ k hor ‰¤ 2. 0
