To observe and analysis the features of images of fundus fluorescein angriography (FFA) in low-perfused retinopathy caused by cephalo-cervical peripheral vascular stenosis or occlusion.

• 观察头颈部周围血管狭窄、闭锁所致低灌注视网膜病变的荧光素眼底血管造影（FFA）特征.