retinal arteriovenous malformation, 3d

retina vascular anomaly arteriovenous malformation blood vessels vision impairment rare condition medical illustration ophthalmology eye anatomy capillary network retinal avm disorders flow abnormality congenital aberration ocular conditions bypass hereditary hemorrhagic telangiectasia wyburnmason syndrome sturgeweber parkes weber oslerweberrendu fistula problems black background ophthalmoscope ophthalmoscopy retinoscopy fundus fundoscopy 3d