Contrast sensitivity in anisometropic amblyopia.
Contrast sensitivity in anisometropic amblyopia.
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DOI：
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发表时间：
1981-09
影响因子：
4.4
通讯作者：
A. Bradley;R. Freeman
中科院分区：
文献类型：
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作者：
A. Bradley;R. Freeman
对比灵敏度函数从10个各向异性弱视的样本测量正弦光栅。从弱视的测试中发现了高空间频率缺陷。这种缺陷随着空间频率的增加而减少，并与屈光参差的程度相关。制定了控制措施，以排除心理物理方法和残余散焦作为这些影响的可能原因。在低空间频率下，两只眼睛之间的差异很小。对一些受试者来说，弱视眼睛的敏感度实际上比正常人高，而对大多数人来说，情况恰恰相反。额外的测试表明，低频的差异可以由两只眼睛之间的放大差异（异视）来解释。这些发现与单眼对比剥夺是导致屈光参差性弱视的原因的观点一致。
Contrast sensitivity functions were measured for sinusoidal gratings from a sample of 10 anisometropic amblyopes. A high spatial frequency deficit was found from tests of the amblyopic eyes of all subjects. This defect decreased with spatial frequency and was correlated with the magnitude of anisometropia. Controls were instituted to rule out psychophysical method and residual defocus as possible causes of these effects. At low spatial frequencies, there were small differences between the two eyes. For some subjects, sensitivities of the amblyopic eyes appeared actually higher than normal whereas the reverse was found for most of the others. Additional tests demonstrated that the low-frequency differences could be accounted for by magnification differences (aniseikonia) between the two eyes. These findings are consistent with the idea that monocular contrast deprivation is the causal agent in anisometropic amblyopia.