1) Vision defect 2) Visual defect 3) Visual disorder 4) Visual impairment 
• (n.) Distorted vision, in which straight lines appear bent.
(an″or-tho´pe-ә) distorted vision in which straight lines appear as curves or angles, and symmetry is incorrectly perceived. strabismus.
An`or·tho'pi·a noun [ New Latin , from Greek ... priv. + ortho- + Greek ..., ..., the eye.] (Medicine) Distorted vision, in which straight lines appear bent. 
[n] - distorted vision in which straight lines appear curved
anorthopia Distorted vision in which straight lines appear as curves or angles, and symmetry is incorrectly perceived; without correct vision. Related references to 'eye' or 'eye part' word families: blepharo-; core-; corneo-; lenti-, lens-; lenticulo-; irido-; ocelli-; oculo-;...
noun distorted vision in which straight lines appear curved