Anderson R S, Ennis F A
Vision Science Research Group, School of Biomedical Sciences, University of Ulster at Coleraine, Londonderry, Northern Ireland.
Vision Res. 1999;39(25):4141-4. doi: 10.1016/s0042-6989(99)00160-1.
We measured detection and resolution acuity for vanishing optotype tumbling E stimuli in both the fovea and at 30 degrees in the periphery to determine if peripheral resolution is sampling limited for this stimulus. In the fovea, where acuity is optically limited, detection and resolution were the same. At 30 degrees, however, detection was markedly better than resolution indicating that peripheral resolution is sampling limited for this stimulus. Detection acuity was higher when contrast was 90% rather than 40%, but resolution did not change with contrast. The vanishing optotype is a legitimate perimetric stimulus to measure retinal ganglion cell density provided the task is resolution and not detection.
我们测量了中央凹以及周边30度处消失视标翻转E刺激的检测敏锐度和分辨敏锐度，以确定该刺激的周边分辨是否受采样限制。在光学上限制敏锐度的中央凹处，检测和分辨是相同的。然而，在30度处，检测明显优于分辨，这表明该刺激的周边分辨受采样限制。当对比度为90%而不是40%时，检测敏锐度更高，但分辨不受对比度影响。如果任务是分辨而非检测，那么消失视标是测量视网膜神经节细胞密度的合理视野检查刺激。
