He looks as pale as the visard of the ghost which cries so miserably at the Theatre, like an oyster-wife, "Hamlet, revenge!"
A vizor (also spelt visor, visard, vizard) is a mask, “a false face.”
"mask," 1550s, altered form of vysar, viser (see visor), by influence of words in -ard. Figurative use from 1570s; common 17c. Also applied to the person with the masks, and used as a verb meaning "to conceal." Related: Vizarded; vizarding.