Visual function is actually very complex. Contrast sensitivity test has been widely used to evaluate visual system diseases. It can quickly find the dysfunction caused by diseases and has the significance of early diagnosis. In the whole spatial frequency range, the spatial frequency response of middle frequency area is better than that of low frequency area and high frequency area, which indicates that visual contrast and visual acuity decrease. It is proved that with the increase of contrast sensitivity with age, the refractive medium function of the eyes decreases, resulting in the decrease of contrast sensitivity of the elderly.
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