circle of Zinn(redirected from circle of Haller)
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circle of Zinn
Anastomosing circle of short ciliary arteries which have pierced the sclera about the optic nerve. Branches pass forward to the choroid, inward to the optic nerve and backward to the pial network. Syn. circle of Haller.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann