Martins Alessandra Carmichael, Vohnsen Brian
Advanced Optical Imaging Group, School of Physics, University College Dublin, Dublin 4, Ireland.
Biomed Opt Express. 2019 Jul 2;10(8):3760-3772. doi: 10.1364/BOE.10.003760. eCollection 2019 Aug 1.
A gradual drop in visibility with obliquely incident light on retinal photoreceptors is namely described by the Stiles-Crawford effect of the first kind and characterized by a directionality parameter. Using a digital micromirror device in a uniaxial flicker system, here we report on variations of this effect with luminance levels, wavelengths within the visible and near-infrared spectrum and retinal regions ranging from the fovea to 7.5° parafoveal. Results show a consistent directionality in mesopic and photopic conditions. Higher directionality is measured for longer wavelengths, and a decrease with retinal eccentricity is observed. Results are discussed in relation to an absorption model for the visual pigments taking the outer-segment packing and thickness of the neural retina into account. Good correspondence is found without enforcing photoreceptor waveguiding.
视网膜光感受器上斜入射光导致的能见度逐渐下降即所谓的第一类斯泰尔斯-克劳福德效应，并由一个方向性参数来表征。在单轴闪烁系统中使用数字微镜器件，我们在此报告了这种效应随亮度水平、可见光和近红外光谱内的波长以及从中央凹到中央凹旁7.5°的视网膜区域的变化情况。结果表明在中间视觉和明视觉条件下具有一致的方向性。对于较长波长测得的方向性更高，并且观察到随着视网膜偏心率的增加而降低。结合考虑神经视网膜外层段堆积和厚度的视觉色素吸收模型对结果进行了讨论。在不强制光感受器波导的情况下发现了良好的对应关系。
