Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.
    

concept

Die Sehschärfe des Menschen und ihre Prüfung : eine physiologische-ophthalmologische Studie / by Leopold Löhner.

Reports of the Committee upon the Physiology of Vision. 10, The measurement of visual acuity / by R.J. Lythgoe.

Test-types for the determinination [i.e. determination] of the acuteness of vision / by H. Snellen.

Die Vereinheitlichung der Bestimmung der Sehschärfe / von E. Landolt.

The accomodation of the eye to distances / by William Clay Wallace.

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Visual acuity

Catalogue

Die Sehschärfe des Menschen und ihre Prüfung : eine physiologische-ophthalmologische Studie / by Leopold Löhner.

Reports of the Committee upon the Physiology of Vision. 10, The measurement of visual acuity / by R.J. Lythgoe.

Test-types for the determinination [i.e. determination] of the acuteness of vision / by H. Snellen.

Die Vereinheitlichung der Bestimmung der Sehschärfe / von E. Landolt.

The accomodation of the eye to distances / by William Clay Wallace.