The Collaborative International Dictionary of English v.0.48:
Asthenopia \As`the*no"pi*a\, n. [Gr. 'a priv. + sqe`nos strength + 'w`ps eye.] Weakness of sight. --Quain. -- As`the*nop"ic, a. [1913 Webster]WordNet (r) 3.0 (2006):
asthenopia n 1: a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem [syn: eyestrain, asthenopia]