stereoacuity

noun

ste·​reo·​acui·​ty ˌster-ē-ō-ə-ˈkyü-ət-ē, ˌstir- 

plural stereoacuities

: the ability to detect differences in distance using stereoscopic cues that is measured by the smallest difference in the images presented to the two eyes that can be detected reliably compare grating acuity, hyperacuity, vernier acuity