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Titolo:
Horse vision and an explanation for the visual behaviour originally explained by the 'ramp retina'
Autore:
Harman, AM; Moore, S; Hoskins, R; Keller, P;
Indirizzi:
Univ Western Australia, Dept Psychol, Nedlands, WA 6907, Australia Univ Western Australia Nedlands WA Australia 6907 nds, WA 6907, Australia Queen Elizabeth II Med Ctr, Lions Eye Inst, Nedlands, WA 6009, Australia Queen Elizabeth II Med Ctr Nedlands WA Australia 6009 WA 6009, Australia
Titolo Testata:
EQUINE VETERINARY JOURNAL
fascicolo: 5, volume: 31, anno: 1999,
pagine: 384 - 390
SICI:
0425-1644(199909)31:5<384:HVAAEF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
GANGLION-CELLS; TOPOGRAPHY; ACUITY; RPE;
Keywords:
horse; vision; acuity; retina; refractive error; visual behaviour;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Harman, AM Univ Western Australia, Dept Psychol, Nedlands, WA 6907, Australia Univ Western Australia Nedlands WA Australia 6907 7, Australia
Citazione:
A.M. Harman et al., "Horse vision and an explanation for the visual behaviour originally explained by the 'ramp retina'", EQUINE V J, 31(5), 1999, pp. 384-390

Abstract

Here we provide confirmation that the 'ramp retina' of the horse, once thought to result in head rotating visual behaviour, does not exist. We found a 9% variation in axial length of the eye between the streak region and thedorsal periphery. However, the difference was in the opposite direction tothat proposed for the 'ramp retina'. Furthermore, acuity in the narrow, intense visual streak in the inferior retina is 16.5 cycles per degree compared with 2.7 cycles per degree in the periphery. Therefore, it is improbablethat the horse rotates its head to focus onto the peripheral retina. Rather, the horse rotates the nose up high to observe distant objects because binocular overlap is oriented down the nose, with a blind area directly in front of the forehead.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/08/20 alle ore 20:52:10