The clinical findings differentiating ophthalmic aery occlusion from central Retinal aery occlusion is

Within a few hours of CRAO the retina loses its transparency, becoming opaque and milky-white, especially in the neighbourhood of the disc and macula. At the fovea centralis, where the retina is extremely thin, the red reflex from the choroid is visible and appears as a round cherry-red spot, presenting a strong contrast to the cloudy white background. As choroid derives its blood supply from the ophthalmic aery, in ophthalmic aery occlusion even choroidal circulation is affected and hence a cherry-red spot is not clearly visible