Schor C, Wesson M, Robertson K M
Am J Optom Physiol Opt. 1986 Aug;63(8):619-26. doi: 10.1097/00006324-198608000-00004.
The variations in fixation disparity (FD) with spatial frequency and retinal locus of fusion locks were examined in two groups of subjects having either steep or flat forced-duction FD curves. FD for subjects with flat curves was unaffected by either spatial frequency or diameter of fusion locks. FD of observers with steep forced-duction curves increased with both the coarseness and eccentricity of fusion locks. Panum's horizontal fusion range increased markedly with target spatial period but only modestly with retinal eccentricity. These results indicate that factors other than the dimensions of Panum's fusional area (PFA) result in the increase of FD found in some observers with peripheral fusion locks.
在两组具有陡峭或平坦强迫性引导固定差异（FD）曲线的受试者中，研究了固定差异（FD）随空间频率和融合锁视网膜位置的变化。具有平坦曲线的受试者的FD不受空间频率或融合锁直径的影响。具有陡峭强迫性引导曲线的观察者的FD随着融合锁的粗糙度和离心率而增加。潘诺氏水平融合范围随目标空间周期显著增加，但仅随视网膜离心率适度增加。这些结果表明，除了潘诺融合区（PFA）的尺寸之外，其他因素也会导致一些具有周边融合锁的观察者的FD增加。
