Fig. 14. Color Doppler imaging of the ophthalmic artery of a patient with severe occlusive carotid artery disease who underwent carotid endarterctomy; images obtained before surgery (A), 1 week (B), and 1 month (C) after surgery. Observe that before surgery, the ophthalmic artery flow was reversed, whereas after surgery it was anterograde. (From Costa V, Kuzniec S, Molnar L, et al: The effects of carotid endarterectomy on the retrobulbar circulation of patients with severe occlusive carotid artery disease: An investigation by color Doppler imaging. Ophthalmology 106:306, 1999.)