Breton M E, Tansley B W
Arch Ophthalmol. 1985 Oct;103(10):1490-5. doi: 10.1001/archopht.1985.01050100066021.
Standard methods for screening color vision defects may be expected to underestimate a color defective's complete chromatic discrimination abilities because the viewing field is confined to the fovea (central 2 degrees). Large-field (8 degrees) Farnsworth-Munsell 100-hue and dichotomous (D-15) tests were constructed. The 100-hue test, along with its small-field counterpart, was administered to five deuteranopes (green defectives) and four protanopes (red defectives). The D-15 small- and large-field tests were given to these same subjects with the addition of two deuteranopes and one protanope. Both deuteranopes and protanopes showed marked improvement on the large-field D-15 and 100-hue tests. This improvement in performance for large-field over small-field viewing is consistent with color-matching data, which show large-field trichromacy in observers who have been demonstrated to be small-field red-green dichromats. These results suggest that tests confined to central fovea viewing provide an incomplete functional description of the color vision of an appreciable number of classic dichromats.
由于视野局限于中央凹（中心2度），用于筛查色觉缺陷的标准方法可能会低估色觉缺陷者的完整颜色辨别能力。因此构建了大视野（8度）的法恩斯沃思-芒塞尔100色调和二分法（D-15）测试。对5名绿色盲患者（绿色缺陷者）和4名红色盲患者（红色缺陷者）进行了100色调测试及其小视野对应测试。对这些受试者进行了D-15小视野和大视野测试，另外还增加了2名绿色盲患者和1名红色盲患者。绿色盲患者和红色盲患者在大视野D-15和100色调测试中均表现出显著改善。大视野观察比小视野观察在表现上的这种改善与颜色匹配数据一致，这些数据表明，在已被证明是小视野红绿色盲的观察者中存在大视野三色视觉。这些结果表明，局限于中央凹观察的测试对相当数量的典型色盲患者的色觉提供了不完整的功能描述。
