Webster’s Revised Unabridged Dictionary · 1913
Blear
Blear (blēer), a. [See Blear, v.] 1. Dim or sore with water or rheum; — said of the eyes.
His blear eyes ran in gutters to his chin. Dryden.
2. Causing or caused by dimness of sight; dim.
Power to cheat the eye with blear illusion. Milton.
Blear, v. t. [imp. & p. p. Bleared; p. pr. & vb. n. Blearing.] [OE. bleren; cf. Dan. plire to blink, Sw. plira to twinkle, wink, LG. plieren; perh. from the same root as E. blink. See Blink, and cf. Blur.] To make somewhat sore or watery, as the eyes; to dim, or blur, as the sight. Figuratively: To obscure (mental or moral perception); to blind; to hoodwink.
That tickling rheums Should ever tease the lungs and blear the sight. Cowper.
To blear the eye of, to deceive; to impose upon. [Obs.] Chaucer.