Fundus OCT, OCT refers to Optical Coherence Tomography, is a fundus imaging system. Its through the near infrared light swept into the human eye fundus, through the different retinal layers of the human eye fundus, different cell layers of the reflected waves, through the computer system analysis and imaging, can reflect the human eye retina, choroid, sclera images. It is not CT and does not contain radiation, it is near-infrared light, which does not cause any damage to the eye, and it can clearly distinguish the structure of the human retina, and can determine the location of the retinal lesion and the size of the lesion. Currently, it has been developed to this OCTA, which means that it can also analyze the blood flow and vascular problems of a person.