word blindness

from The Century Dictionary.

• noun Loss, through disease, of the ability to read, although the faculties of speaking, writing, and understanding spoken words may remain unimpaired.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The common term for alexia

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun inability to perceive written words