The Collaborative International Dictionary of English v.0.48:

Purblind \Pur"blind`\, a. [For pure-blind, i. e., wholly blind.
   See Pure, and cf. Poreblind.]
   1. Wholly blind. "Purblind Argus, all eyes and no sight."
      --Shak.
      [1913 Webster]

   2. Nearsighted, or dim-sighted; seeing obscurely; as, a
      purblind eye; a purblind mole.
      [1913 Webster]

            The saints have not so sharp eyes to see down from
            heaven; they be purblindand sand-blind. --Latimer.
      [1913 Webster]

            O purblind race of miserable men.     --Tennyson.
      [1913 Webster] -- Pur"blind`ly, adv. --
      Pur"blind`ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

purblind
    adj 1: having greatly reduced vision [syn: dim-sighted, near-
           blind, purblind, sand-blind, visually impaired,
           visually challenged]
    2: lacking in insight or discernment; "too obtuse to grasp the
       implications of his behavior"; "a purblind oligarchy that
       flatly refused to see that history was condemning it to the
       dustbin"- Jasper Griffin [syn: obtuse, purblind]