Conclusion The hemodynamic features of central retinal arteries in patients with retinal vein occlusion are low blood flow velocity, low vessel filling intensity and poor distal tissue blood filling.

Aiming at the bad performance of existing retinal blood vessel segmentation methods for small and low contrast vessels, a new segmentation method based on transition region extraction is proposed.

Conclusion the renal pathological changes and increased resistance of retinal blood vessel are the main reasons leading to postoperative hypertension in patients with APA.