Circle-ellipse discrimination in man and monkey.
D000328:Adult; D000367:Age Factors; D000818:Animals; D001251:Astigmatism / Q000503:physiopathology; D002522:Chlorocebus aethiops; D005260:Female; D005556:Form Perception; D006801:Humans; D008029:Lighting; D008297:Male; D008875:Middle Aged