Brink H B, van Blokland G J
Royal Netherlands Eye Hospital, Utrecht.
J Opt Soc Am A. 1988 Jan;5(1):49-57. doi: 10.1364/josaa.5.000049.
We have assessed retinal birefringence in the foveal and parafoveal regions by applying Mueller matrix ellipsometry on the human eye in vivo. Basically, a light beam passed the ocular media twice and was scattered at the fundus intermediately. Keeping the entry and exit positions on the cornea constant and varying the retinal location along a circle around the foveal center enabled us to separate the corneal and retinal components of the measured retardation. We conclude that the retina within the outer margin of the parafovea behaves as a uniaxial crystal, with its slow axis radially oriented from the fovea and a retardation of about 16 deg (to 70 deg in the corneal center). We believe that Henle's fiber layer causes retardation in this specific configuration of entrance and exit beams. The outer segments of the photoreceptors, although birefringent, have their optic axes aligned with these beams.
我们通过在人眼活体上应用穆勒矩阵椭圆偏振测量法评估了中央凹和中央凹旁区域的视网膜双折射。基本上，一束光两次穿过眼内介质，并在眼底中间散射。保持光束在角膜上的入射和出射位置不变，并沿着围绕中央凹中心的圆周改变视网膜位置，使我们能够分离测量延迟中的角膜和视网膜成分。我们得出结论，在中央凹旁外缘内的视网膜表现为单轴晶体，其慢轴从中央凹径向排列，延迟约为16度（在角膜中心为70度）。我们认为，亨勒纤维层在这种特定的入射和出射光束配置中会导致延迟。光感受器的外段虽然具有双折射性，但其光轴与这些光束对齐。
