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A polarization measurement method for the quantification of retardation in optic nerve fiber layer

机译:视神经纤维层中延迟定量的偏振测量方法

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The thickness measurement of the optic nerve fiber layer is one of the most important evaluations for carrying out glaucoma diagnosis. Because the optic nerve fiber layer has birefringence, the thickness can be measured by illuminating eye optics with circular polarized light and analyzing the elliptical rate of the detected polarized light reflected from the optic nerve fiber layer. In this method, the scattering light from the background and the retardation caused by the cornea disturbs the precise measurement. The latter problem can be avoided by using a Babinet-Soleil compensator. If the Stokes vector expressing the whole state of polarization can be detected, we can eliminate numerically the influence of the background scattering and of the retardation caused by the cornea. Because the retardation process of the eye optics can be represented by a numerical equation using the retardation matrix of each component and also the nonpolarized background scattering light, it can be calculated by using the Stokes vector. The instruments that are currently on the market do not detect the Stokes vectors of the components of the eye. Also, at this time, they are not able to measure retardation distribution in one shot. We applied a polarization analysis system that can detect the Stokes vector onto the fundus camera. The polarization analysis system is constructed with a CCD area image sensor, a linear polarizing plate, a micro phase plate array, and a circularly polarized light illumination unit. With this simply constructed system, we can calculate the retardation caused only by the optic nerve fiber layer and it can predict the thickness of the optic nerve fiber layer. We report the method and the results graphically showing the retardation of the optic nerve fiber layer without the retardation of the cornea.
机译:视神经纤维层的厚度测量是开展青光眼诊断的最重要评估之一。因为视神经纤维层具有双折射,所以厚度可以通过用圆偏振光照射眼镜眼并分析从视神经纤维层反射的检测到的偏振光的椭圆速率来测量。在这种方法中,由背景和角膜引起的散射光与由角膜引起的延迟扰动了精确测量。通过使用Babinet-Soleil补偿器,可以避免后一种问题。如果表达偏振的整个状态斯托克斯矢量可以被检测到,就可以消除数值的背景散射的和所造成的角膜的延迟的影响。因为眼镜眼的延迟过程可以通过使用每个组件的延迟矩阵和非极化背景散射光的数值来表示,所以它可以通过使用Stokes向量来计算。目前在市场上的仪器不会检测到眼睛部件的斯托克斯载体。此外,此时,它们无法在一次拍摄中测量延迟分布。我们应用了一种偏振分析系统,可以检测斯托克斯矢量在眼底相机上。偏振分析系统被构造成具有CCD区域图像传感器,线性偏振板,微相位片阵列和圆偏振光照射单元。通过这种简单的构造系统,我们可以计算仅由视神经纤维层引起的延迟,并且可以预测视神经纤维层的厚度。我们报告了图形方式和结果,显示了视神经纤维层的延迟而不延迟角膜。

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