A novel interferometric instrument for measuring neural transfer function (NTF) of the eye is presented. The device is based on a liquid-crystal-on-silicon spatial light modulator (SLM), which is used to create two laterally separated wavefronts in the pupil plane of the eye that interfere on the retina. The phase mask on the SLM, consisting of two diffraction gratings mixed in a checkerboard pattern and acting as a shearing interferometer, allows independent control of spatial frequency, orientation, and contrast of the fringes, as well as the field of view in a wide polychromatic spectrum. Coupled with a supercontinuum source, the system is able to produce achromatic fringes on the retina. The instrument was successfully tested in six normal subjects in four light conditions: polychromatic light and monochromatic blue, green and red light respectively (central wavelengths - 450, 550 and 650 nm). On average, the NTF in polychromatic light was approximately 20% higher than for green and red light, although not statistically significant due to high intersubject variability. Due to all-digital control of the interference fringes, the device is optically simple and virtually unsusceptible to vibrations, allowing its use in a non-laboratory environment. The study also contributes to color vision research, allowing to evaluate contrast sensitivity function without monochromatic or chromatic aberrations.

中文翻译：

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基于 SLM 的干涉仪用于评估眼睛的多色神经传递函数

提出了一种用于测量眼睛神经传递函数 (NTF) 的新型干涉仪。该设备基于硅基液晶空间光调制器 (SLM)，用于在眼睛的瞳孔平面中创建两个横向分离的波前，这些波前会干扰视网膜。SLM 上的相位掩模由以棋盘图案混合的两个衍射光栅组成，并充当剪切干涉仪，允许独立控制空间频率、方向和条纹对比度，以及宽多色视场光谱。结合超连续谱光源，该系统能够在视网膜上产生消色差条纹。该仪器在四种光线条件下在六名正常受试者中成功测试：多色光和单色蓝色，分别为绿光和红光（中心波长 - 450、550 和 650 nm）。平均而言，多色光中的 NTF 比绿光和红光高约 20%，尽管由于受试者间的高变异性而没有统计学意义。由于干涉条纹的全数字控制，该设备在光学上很简单，几乎不受振动影响，允许在非实验室环境中使用。该研究还有助于色觉研究，允许在没有单色或色差的情况下评估对比敏感度函数。由于干涉条纹的全数字控制，该设备在光学上很简单，几乎不受振动影响，允许在非实验室环境中使用。该研究还有助于色觉研究，允许在没有单色或色差的情况下评估对比敏感度函数。由于干涉条纹的全数字控制，该设备在光学上很简单，几乎不受振动影响，允许在非实验室环境中使用。该研究还有助于色觉研究，允许在没有单色或色差的情况下评估对比敏感度函数。