Complete lack of perception of stereopsis. It may result from blindness in one eye or strabismus, but also from some unknown cause in people with otherwise normal vision in both eyes. Stereo-blindness in some parts of the visual field also occurs in people who have had their corpus callosum or optic chiasma cut or destroyed. However, some depth perception may still exist thanks to monocular cues (e.g. aerial perspective, light and shadow, overlap, relative size).
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann