Red eye

What is Red eye?

Red eye definition and meaning on Dictionary terms:
the condition of having bloodshot eyes, as from eyestrain or lack of sleep.
Also red eye, redeye. Informal. a commercial airline flight between two distant points that departs late at night and arrives early in the morning.
redeye(def 3).
an unwanted photographic effect in which a person’s iris appears to be red: caused by the reflection of a flashbulb off the blood vessels of the retina.

Also redeye. Informal. of or indicating a long-distance flight that leaves late at night: the red-eye special from New York to Los Angeles.