Eccentricity Perception in the Periphery of Normal Observers and Those with Retinitis Pigmentosa
Eccentricity Perception in the Periphery of Normal Observers and Those with Retinitis Pigmentosa
复制标题
正常观察者和色素性视网膜炎患者周边的偏心知觉
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
W. Noell
中科院分区：
文献类型：
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作者：
L. Temme;J. Maino;W. Noell
在4名眼科正常观察者和3名患有视网膜色素变性（RP）的年轻观察者中，测量了在Goldmann周长中出现的超阈值闪光（III/4e）的偏心率。这项任务是通过在一张纸上画180毫米的线上做标记来表明与每个闪光中心固定的感知距离。在这条线的中间有一个hash标记。观察者被告知，哈希标记应该对应于注视，线的末端对应于视野的极限。测试了垂直、水平和两个45°斜子午线。结果表明：1。沿着被测子午线的场的范围决定了感知偏心，即，在法线的时间场中，45°的偏心被认为与在上级场中30°的偏心相同。2. 中心的20°被认为比其他任何20°代表更多的感知场。3. 沿着子午线，从固定位置延伸到沿子午线到视场极限的16%的偏心率被正常观测者认为延伸到视场的25%。4. 另一方面，RP观测者报告说，沿着子午线，从固定到场极限的8%的偏心被认为延伸到场的25%。II/4靶的动力学原生代在RP观测者中没有显示出视野收缩的证据。然而，从大约10°开始，灵敏度的损失是明显的。RP患者的全视场单闪视网膜电图不可记录。这些数据被解释为揭示了在RP相对早期阶段中央野的知觉放大。
ABSTRACT The perception of the eccentricity of a suprathreshold light flash (III/4e) presented in a Goldmann perimeter was measured in four ophthalmologically normal observers and three young observers with retinitis pigmentosa (RP). The task was to indicate the perceived distance from central fixation of each light flash by making a mark on a 180‐mm line drawn on a sheet of paper. In the center of the line was a hash mark. Observers were instructed that the hash mark should correspond to fixation and the ends of the line to the limits of the visual field. The vertical, horizontal, and both 45° oblique meridians were tested. The results showed that: 1. The extent of the field along the tested meridian determined perceived eccentricity, i.e., eccentricity of 45° in the temporal field of normals was perceived as equally eccentric as 30° in the superior field. 2. The central 20° were taken to represent more of the perceptual field than any other 20°. 3. Along a meridian, the eccentricity which extends from fixation to 16% of the way to the field limit along the meridian is perceived as extending to 25% of the field by normal observers. 4. On the other hand, observers with RP reported that along a meridian the eccentricity extending from fixation to 8% of the field limit is perceived as extending to 25% of the field. Kinetic primary with the II/4 target showed no evidence of field constriction in observers with RP. However, losses in sensitivity are evident starting at about 10°. Full field single flash electroretinograms were unrecordable in the observers with RP. The data were interpreted to reveal a perceptual magnification of the central field in the relatively early stages of RP.