Visual Acuity

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Abstract
This review with 236 references discusses types of visual acuity tasks and tests; variables influencing visual acuity, including luminance, state of adaptation, contrast, wavelength, exposure duration, photic intermittency, refractive state of the eye, pupil size, accommodation, optical blurring, orientation of test object, eye movement, stabilized retinal image, target movement, retinal position, binocular effects, age, drugs, unique environments, amblyopia, masking effects, training, and, comparative animal studies. Animals studied include humans, cat, rhesus monkey, rat, lemming, bat, fruitfly, housefly and locust.