optic pit

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op·tic pit

a congenital anomaly characterized by a focal depression of the temporal optic nerve head.

optic pit

A small indentation of the optic nerve head. It may sometimes release fluid below the retina, which can cause central retinal detachment.
See also: pit

pit, optic 

A depression on each side of the end of the neural ectoderm (or neural tube) of the embryo. The pit deepens to form the optic vesicle. Syn. optic sulcus.