Four years of annual studies of chimpanzee vision.
D000367:Age Factors; D000818:Animals; D004777:Environment; D005260:Female; D015186:Hominidae / Q000502:physiology*; D008297:Male; D009216:Myopia / Q000209:etiology; D012029:Refraction, Ocular; D012737:Sex Factors; D014465:Ultrasonics; D014785:Vision, Ocular