Cone spacing and waveguide properties from cone directionality measurements
Cone spacing and waveguide properties from cone directionality measurements
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DOI：
10.1364/josaa.16.000995
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发表时间：
1999-05-01
影响因子：
1.9
通讯作者：
Burns, SA
中科院分区：
文献类型：
--
作者：
Marcos, S;Burns, SA
反射测量技术通过测量从漂白的视网膜反射的光的瞳孔平面处的光分布来估计视网膜锥的方向性。Marcos等人的波导散射模型[J. Opt. Sec. am. A 15，2012（1998）]预测，该强度分布的形状由视锥光感受器的波导特性和视锥马赛克的形貌（视锥间距）两者决定。我们进行了两种类型的圆锥方向性测量。在第一种类型中，通过测量从视网膜返回的具有单入射瞳孔位置的光的空间分布（单入射测量）来获得视锥方向性估计。在第二种类型中，通过测量作为入射光瞳位置的函数的通过光瞳引导返回的光的总量（多入射测量）来获得估计。正如模型所预测的那样，单入口测量比多入口测量提供更窄的分布，因为前者受波导和散射的影响，而后者主要受波导的影响。在不同的视网膜偏心率和在两个不同的波长的测量是一致的模型。我们表明，更广泛的多入口测量不占锥混乱。多项测量的结果更接近于心理物理学的斯蒂尔斯-克劳福德效应的测量结果（尽管仍然更窄），并且视网膜偏心率和波长的变化是相似的。通过结合单次和多次测量，我们可以估计锥间距。在0度和a度视网膜偏心率的估计是在良好的协议与已发表的解剖数据。(C)1999年美国光学学会[S0740 - 3232（99）03205 - 6]。
Reflectometric techniques estimate the directionality of the retinal cones by measuring the distribution of light at the pupil plane of light reflected off the bleached retina. The waveguide-scattering model of Marcos et al. [J. Opt. Sec. Am. A 15, 2012 (1998)] predicts that the shape of this intensity distribution is determined by both the waveguide properties of the cone photoreceptors and the topography of the cone mosaic (cone spacing). We have performed two types of cone directionality measurement. In the first type, cone directionality estimates are obtained by measuring the spatial distribution of light returning from the retina with a single-entry pupil position (single-entry measuements). In the second type, estimates are obtained by measuring the total amount of light guided back through the pupil as a function of entry pupil position (multiple-entry measurements). As predicted by the model, single-entry measurements provide narrower distributions than the multiple-entry measurements, since the former are affected by both waveguides and scattering and the latter are affected primarily by waveguides. Measurements at different retinal eccentricities and at two different wavelengths are consistent with the model. We show that the broader multiple-entry measurements are not accounted for by cone disarray. Results of multiple-entry measurements are closer to results from measurements of the psychophysical Stiles-Crawford effect (although still narrower), and the variation with retinal eccentricity and wavelength is similar. By combining single- and multiple-entry measurements, we can estimate cone spacing. The estimates at 0- and a-deg retinal eccentricities are in good agreement with published anatomical data. (C) 1999 Optical Society of America [S0740-3232(99)03205-6].