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The presence of RAPD (also known as Marcus Gunn pupil) indicates asymmetrical retinal, optic nerve, chiasm, optic tract or mid-brain pre-tectal area damage.
The neural integrator is under adaptive control via the cerebellar flocculus/paraflocculus, which is itself driven by retinal slip signals emanating from the nucleus of the optic tract via the inferior olive.
Afferent input from the retina, optic nerve, and subsequent anterior visual pathways (chiasm, optic tract and midbrain pathways)