has part has part characteristic of part of has modifier Abnormality of ophthalmic artery The ophthalmic artery (OA) is the first branch of the internal carotid artery distal to the cavernous sinus. Branches of the OA supply all the structures in the orbit as well as some structures in the nose, face and meninges. Abnormal internal carotid artery morphology quality abnormal ophthalmic artery