1) Vision defect 2) Visual defect 3) Visual disorder 4) Visual impairment 
Metamorphopsia is a type of distorted vision in which a grid of straight lines appears wavy and parts of the grid may appear blank. People with this condition often first notice this when looking at mini-blinds in their home. It is mainly associated with macular degeneration, particularly age-related macular degeneration with choroidal neovascular...
Distortion of visual images. ... Origin: meta-+ G. Morphe, shape, + opsis, vision ... (05 Mar 2000) ... 
(met″ә-mor-fop´se-ә) defective vision, with distortion of the shape of objects seen.
Type: Term Pronunciation: met′ă-mōr-fop′sē-ă Definitions: 1. Distortion of visual images.
[n] - a defect of vision in which objects appear to be distorted
noun a defect of vision in which objects appear to be distorted; usually due to a defect in the retina