You searched for: “optic neuritis
optic neuritis
Acute impairment of vision in one eye or both eyes, which may be affected simultaneously or successively; and which may recover spontaneously or leave the patient with a scotoma or scotomas; or even blindness.

Scotoma refers to an area of lost, or depressed vision, within the visual field; surrounded by an area of a less depressed, or of normal, vision.