My ophthalmologist said that i have afferent pupillary defect (apd 5) and hippus, what does this means?

APD and Hippus: When a light is shined on the eye, the pupil constricts. If the two eyes percieve equal amounts of light then when swinging the light from one eye to the next, the pupil should remain the same size. When one eyes does not work as well as the other, when the light is moved from the good eye to the injured, the pupil enlarges, and when moved back to the good eye, the pupil constricts. That is apd.

Pupil changes: An afferent defect of the pupil refers to an abnormal dilation instead of constriction when light hits the eye. It is due to major loss of total light input in the affected eye such as massive retinal loss, optic nerve disease, etc. Hippus is a twitchy pupil jerkiness and sometimes is normal but can be seen in response to certain drugs.