Optic Nerve Origin
After an episode of demyelinating optic neuritis, a relative conduction delay within the affected optic nerve may lead to an altered perception of motion. Because of the disparity in neuronal transmission, a pendulum, for example, may appear to trace an elliptical path instead of its true single-plane oscillation (Pulfrich phenomenon).
Excerpted from BCSC 2020-2021 series: Section 5 - Neuro-Ophthalmology. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.