Dissociations between stereoacuity and visual acuity with binocular night vision goggles.

A significant main effect of eye condition was observed, F (1,23) = 6.26, η p 2 = 0.214, p < 0.02, but neither the main effect viewing condition, F (1,23) = 1.56, η p 2 = 0.064, p > 0.22, nor its interaction with eye condition, F (1,23) = 2.06, η p 2 = 0.082, p > 0.16, approached significance.

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So, if the choice of focal distance results in significant defocusing of scene elements in one’s immediate vicinity (i.e., where stereopsis is most effective), and if defocusing disproportionately affects stereoacuity (Goodwin & Romano, 1985 ; Westheimer & McKee, 1980 ), the consequences for depth perception may be significant.

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