vernier acuity

noun
ver·​ni·​er acuity | \ˈvər-nē-ər- \

Medical Definition of vernier acuity 

: the aspect of visual acuity that involves the ability to detect the alignment or lack of alignment of the two parts of a broken line (as in reading a vernier scale) — compare grating acuity, hyperacuity, stereoacuity

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