Harwerth R S, Smith E L, Okundaye O J
Exp Brain Res. 1983;53(1):142-50. doi: 10.1007/BF00239406.
Orientation anisotropies were investigated for monkeys with normal visual acuity and for monkeys with experimentally induced amblyopia. It was found that the majority of control monkeys showed a normal oblique effect if any existing refractive errors were carefully corrected, but a few of the control monkeys had a meridional amblyopia, i.e., an orientation anisotropy in which the grating orientation for the greatest and lowest contrast sensitivities were correlated with the principal meridians of an astigmatic refractive error even when the refractive error was corrected. For monkeys with strabismic amblyopia caused by a surgically induced divergent strabismus, the orientation anisotropies showed a vertical effect in which contrast sensitivity was lower for vertically oriented gratings than for horizontally oriented gratings. However, monkeys with the same degree of amblyopia resulting from experimental procedures that did not involve a misalignment of the visual axes showed orientation anisotropies that corresponded to the usual oblique effect.
对视力正常的猴子和实验性诱导弱视的猴子的方向各向异性进行了研究。结果发现，如果仔细矫正任何现有的屈光不正，大多数对照猴子表现出正常的倾斜效应，但少数对照猴子有子午线弱视，即一种方向各向异性，即使屈光不正得到矫正，最大和最低对比度敏感度的光栅方向仍与散光性屈光不正的主子午线相关。对于因手术诱导的外斜视导致的斜视性弱视的猴子，方向各向异性表现出垂直效应，即垂直方向的光栅的对比度敏感度低于水平方向的光栅。然而，由不涉及视轴错位的实验程序导致相同程度弱视的猴子表现出与通常的倾斜效应相对应的方向各向异性。
