Source : Webster's Revised Unabridged Dictionary (1913)

Blear \Blear\, 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 \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.

Source : WordNet®

blear
     adj : tired to the point of exhaustion [syn: {bleary}, {bleary-eyed},
            {blear-eyed}]

blear
     v : make dim or indistinct; "The drug blurs my vision" [syn: {blur}]
         [ant: {focus}]