Bill Harvey discusses last week's condition (09.07.10)
The blood supply of the retina is prone to atheromatous blockages. The route from aorta to common carotid to internal carotid to ophthalmic artery is direct and allows calcific material from the heart valve to lodge, typically, at bifurcations close to or within the eye. Any occlusion up to the ophthalmic artery will affect both the retinal and ciliary arteries. However, the posterior ciliary and retinal arteries are separate branches of the ophthalmic and therefore occlusion tends to affect one or the other but much more rarely both.
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