acuity

acu*i*ty

noun

{bc}keenness of perception

visual acuity

noun

{bc}the relative ability of the visual organ to resolve detail that is usually expressed as the reciprocal of the minimum angular separation in minutes of two lines just resolvable as separate and that forms in the average human eye an angle of one minute

hy*per*acu*i*ty

noun

{bc}greater than normal acuteness of a sense