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    Cornea/External Disease

    Central retinal artery occlusion, or CRAO, is associated with a sudden and profound unilateral loss of vision. There may be a prior history of transient ischemic attacks or prior episodes of transient visual loss. Examination will reveal an ipsilateral afferent pupillary defect (testing method is described in Appendix 1, “Eye Examination Techniques”). Ophthalmoscopic examination will reveal narrowed retinal arterioles and diffuse, gray retinal pallor in all areas except the reddish foveal region, giving the appearance of a “cherry-red spot.”