a. 充血的

[ adj ]
(of an eye) reddened as a result of locally congested blood vessels; inflamed
<adj.all>
bloodshot eyes

Bloodshot \Blood"shot`\, a. [Blood + shot, p. p. of shoot to
variegate.]
Red and inflamed; suffused with blood, or having the vessels
turgid with blood, as when the conjunctiva is inflamed or
irritated.

His eyes were bloodshot, . . . and his hair disheveled.
--Dickens.