Diagnosis of eye is a method to diagnose diseases by observing the changes of spirits,expressions,shapes and states of eyes. Fundus is the only tissue which can directly observe terminal blood vessel of body and is the observation window of micro vascular lesions of the whole body. Fundus observation is the most important content. Methods of observation of morphology and function of fundus pathological changes include ophthalmoscope,fundus camera,scanning laser ophthalmoscopy,fundus fluorescein angiography( FFA),indocyanine green choroidal an...