The eye of the Chinchilla (C. lanigera)

Detwiler, S. R.

doi:10.1002/jmor.1050840106

Cited by 15 publications

(20 citation statements)

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“…13 (The name laniger is from Latin, meaning "woolly"). 13 (The name laniger is from Latin, meaning "woolly").…”

Section: Biology and Husbandry Of Chinchillasmentioning

confidence: 99%

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Biology, Husbandry, and Clinical Techniques of Guinea Pigs and Chinchillas

Quesenberry¹,

Donnelly²,

Mans³

2012

Ferrets, Rabbits, and Rodents

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“…13 (The name laniger is from Latin, meaning "woolly"). 13 (The name laniger is from Latin, meaning "woolly").…”

Section: Biology and Husbandry Of Chinchillasmentioning

confidence: 99%

“…13 A large and exposed corneal segment, a vertical slit pupil, and a heavily pigmented iris characterize the eyes of chinchillas. The iris is densely pigmented with a vertical pupil, both features consistent with the chinchillas' habit of basking in the sun in their high-altitude habitat.…”

Section: Anatomy Physiology and Behavior General Characteristicsmentioning

confidence: 99%

Biology, Husbandry, and Clinical Techniques of Guinea Pigs and Chinchillas

Quesenberry¹,

Donnelly²,

Mans³

2012

Ferrets, Rabbits, and Rodents

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“…Up to the present day, only little information on the anatomy of chinchilla eyes and their adnexa is available 3–5 . Chinchillas have low Schirmer tear tests and low blinking frequencies; this information is based on the results of two studies 6,7 .…”

Section: Introductionmentioning

confidence: 99%

“…Up to the present day, only little information on the anatomy of chinchilla eyes and their adnexa is available. [3][4][5] Chinchillas have low Schirmer tear tests and low blinking frequencies; this information is based on the results of two studies. 6,7 On slit-lamp examination, no openings of the Meibomian glands are detectable; hence, little information is known about the structures contributing to the tear film.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the conjunctival goblet cells and the characteristics of the glands associated with the eye in chinchillas (Chinchilla Laniger)

Voigt

Fuchs‐Baumgartinger

Egerbacher

et al. 2012

Veterinary Ophthalmology

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“…To test this hypothesis, we compared the 3D aVOR of two well‐characterised simian primates (humans and squirrel monkeys) to that of a lateral‐eyed, afoveate mammal ( Chinchilla laniger ). Although the chinchilla's rod‐only retina includes a horizontally oriented ‘visual streak’ with receptor density ∼50% higher than in the retinal periphery, it has no fovea and no cones (Detwiler, 1949; Peichl et al 1987), and the resting optic axes of the chinchilla's eyes align approximately with the planes of the semicircular canals. (The resting eye axes in the chinchilla are <25 deg from the respective vertical canal axes, and the eyes share <30 deg of binocular visual field overlap.)…”

Section: Introductionmentioning

confidence: 99%

Adaptation of the vestibulo-ocular reflex for forward-eyed foveate vision

Migliaccio¹,

Minor²,

Santina³

2010

The Journal of Physiology

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To maintain visual fixation on a distant target during head rotation, the angular vestibulo-ocular reflex (aVOR) should rotate the eyes at the same speed as the head and in exactly the opposite direction. However, in primates for which the 3-dimensional (3D) aVOR has been extensively characterised (humans and squirrel monkeys (Saimiri sciureus)), the aVOR response to roll head rotation about the naso-occipital axis is lower than that elicited by yaw and pitch, causing errors in aVOR magnitude and direction that vary with the axis of head rotation. In other words, primates keep the central part of the retinal image on the fovea (where photoreceptor density and visual acuity are greatest) but fail to keep that image from twisting about the eyes' resting optic axes. We tested the hypothesis that aVOR direction dependence is an adaptation related to primates' frontal-eyed, foveate status through comparison with the aVOR of a lateral-eyed, afoveate mammal (Chinchilla lanigera). As chinchillas' eyes are afoveate and never align with each other, we predicted that the chinchilla aVOR would be relatively low in gain and isotropic (equal in gain for every head rotation axis). In 11 normal chinchillas, we recorded binocular 3D eye movements in darkness during static tilts, 20-100 deg s −1 whole-body sinusoidal rotations (0.5-15 Hz), and 3000 deg s −2 acceleration steps. Although the chinchilla 3D aVOR gain changed with both frequency and peak velocity over the range we examined, we consistently found that it was more nearly isotropic than the primate aVOR. Our results suggest that primates' anisotropic aVOR represents an adaptation to their forward-eyed, foveate status. In primates, yaw and pitch aVOR must be compensatory to stabilise images on both foveae, whereas roll aVOR can be under-compensatory because the brain tolerates torsion of binocular images that remain on the foveae. In contrast, the lateral-eyed chinchilla faces different adaptive demands and thus enlists a different aVOR strategy.

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The eye of the Chinchilla (C. lanigera)

Cited by 15 publications

References 1 publication

Biology, Husbandry, and Clinical Techniques of Guinea Pigs and Chinchillas

Biology, Husbandry, and Clinical Techniques of Guinea Pigs and Chinchillas

Investigations on the conjunctival goblet cells and the characteristics of the glands associated with the eye in chinchillas (Chinchilla Laniger)

Adaptation of the vestibulo-ocular reflex for forward-eyed foveate vision

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