视觉系统最重要的功能是形觉,即不仅能看到物体,而且能分辨其形状。目前在临床上评价形觉的主要手段是视力表,但单纯用视力表检查视角大小,只能反映黄斑对高空间频率小目标的分辨能力。而对比敏感度(contrastsensitivity,CS)代表人眼对不同空间频率的分辨力,Ⅱ型糖尿病患者在用 The most important function of the visual system is shape, that is, not only the object but also the shape can be distinguished. At present, the main means of evaluating the shape of the eye in clinical practice is the eye chart, but simply using the eye chart to check the size of the view angle can only reflect the ability of the macula to distinguish small targets with high spatial frequencies. Contrast sensitivity (CS) represents the resolution of the human eye to different spatial frequencies, and type 2 diabetes patients are using