Fig 2.

Comparison of pupillary constriction ratio (A), constriction latency (B), average constriction velocity (ACV) (C), and average dilation velocity (ADV) (D) among patients with acute and chronic phases of optic neuritis (ON), nonarteritic ischemic optic neuropathy (NAION) and normal controls. In the ON group, all these four PLR parameters improved in the chronic phase compared to those in the acute phase (all P < 0.05). On the contrary, there were no significant differences of four parameters between acute and chronic phases in the NAION group.