NEURAL CONTRIBUTION TO SPATIOTEMPORAL CONTRAST SENSITIVITY DECLINE IN HEALTHY AGING EYES
NEURAL CONTRIBUTION TO SPATIOTEMPORAL CONTRAST SENSITIVITY DECLINE IN HEALTHY AGING EYES
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DOI：
10.1016/0042-6989(90)90066-t
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发表时间：
1990-01-01
期刊：
影响因子：
1.8
通讯作者：
MACVEIGH, D
中科院分区：
文献类型：
--
作者：
ELLIOTT, D;WHITAKER, D;MACVEIGH, D
对比敏感度阈值在空间和时间频率范围内测量了一组年轻和年长的观察者。结果表明，年龄较大的年龄组的对比敏感性显著降低，但空间和时间频率的组合最低。然后用年轻的观察者作为实验对象来模拟老年性瞳孔缩小和年老眼睛的光透射减少。这种减少视网膜光照的综合效应没有产生显著的灵敏度变化。这些发现被讨论在视觉通路内的神经损失随着年龄的增长。
Contrast sensitivity thresholds were measured over a range of spatial and temporal frequencies in both a group of young and older observers. Results demonstrate a significant reduction in contrast sensitivity of the older age group at all but the lowest combinations of spatial and temporal frequencies investigated. The senile miosis and reduced optical transmission of the older eye was then mimicked using the younger observers as subjects. This combined effect of reducing retinal illumination produced no significant change in sensitivity. These findings are discussed in terms of neural loss within the visual pathways with increasing age.