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搭建了基于波前像差的神经对比敏感度(NCSF)测试系统。该系统在测试人眼空间对比敏感度(CSF)的同时,利用Hartmann-Shack波前传感器测量人眼波前像差,通过计算进而得到人眼的NCSF。与通过两种设备分别测量全视觉CSF和波前像差获得NCSF相比,该方法避免了不同测试状态下像差波动的影响,简化了测试过程;和传统激光干涉方法测量NCSF相比,该方法避免了激光干涉产生的相干噪音和激光散斑等不利因素,并且通过改变不同亮度不同颜色视标,可以得到不同亮度,不同波长下的NCSF。选用绿光视标对四例正常人眼的NCSF进行了测量,结果表明:该系统可以同时获得人眼的全视觉CSF、屈光系统调制传递函数和NCSF;在同等亮度下,不同人眼的NCSF存在个体差异;对同一个体,NCSF曲线的最大值对应的空间频率比全眼空间CSF曲线的最大值对应的空间频率高一些。
Set up the neural contrast sensitivity (NCSF) test system based on wavefront aberration. The system measures the human eye spatial contrast sensitivity (CSF) at the same time, the use of Hartmann-Shack wavefront sensor to measure the human wavefront aberration, calculated by the human eye to get NCSF. Compared with the method of measuring total visual CSF and wavefront aberration to obtain NCSF by two devices, the method avoids the influence of aberration fluctuation in different test states and simplifies the testing process. Compared with the traditional laser interferometry method for measuring NCSF The method avoids the unfavorable factors such as coherent noise generated by laser interference and laser speckle, and NCSF with different brightness and wavelength can be obtained by changing the different colors of different color visual targets. The green light optometrists were used to measure the NCSF of four normal eyes. The results show that the system can obtain the total visual CSF, the refractive system modulation transfer function and the NCSF simultaneously. Under the same brightness, There is individual difference in NCSF. For the same individual, the spatial frequency corresponding to the maximum value of NCSF curve is higher than the spatial frequency corresponding to the maximum value of CSF curve in the whole eye space.