Foveal and peripheral thresholds for detection and resolution of vanishing optotype tumbling E's

被引:16
作者
Anderson, RS [1 ]
Ennis, FA [1 ]
机构
[1] Univ Ulster, Sch Biomed Sci, Vis Sci Res Grp, Coleraine BT52 1SA, Londonderry, North Ireland
关键词
aliasing; detection; peripheral acuity; resolution; vanishing optotype;
D O I
10.1016/S0042-6989(99)00160-1
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:4141 / 4144
页数:4
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