Assessment of visual acuity and contrast sensitivity in the chick using an optokinetic nystagmus paradigm
(1998) Assessment of visual acuity and contrast sensitivity in the chick using an optokinetic nystagmus paradigm. Vision Research 38(17):pp. 2629-2634.
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Abstract
While the chick is one of the widely used animal models for eye growth studies very little is known about its visual spatial resolution performance. Using optokinetic nystagmus responses as an indicator of stimulus visibility, we estimated the visual acuity of young chicks to be between 6.0 and 7.7 cycles deg-1 at 2 and 4 days of age and slightly higher, between 7.7 and 8.6 cycle deg-1, at 8 days. Contrast sensitivity measured using the same experimental paradigm was greatest at around 1.2 cycle deg-1, for which the contrast threshold lay between 4% and 11%. Sensitivity became progressively poorer for frequencies both higher and lower than this. These data suggest that the visual performance of the chick is slightly poorer than that of the pigeon which has a similar eye size and exhibits similar foraging behaviour.
| Item Type: | Journal Article |
|---|---|
| Status: | Published |
| Keywords: | Animals, Newborn/*physiology; Chickens/*physiology; Contrast Sensitivity/*physiology; Visual Acuity/*physiology; Animals; Nystagmus, Optokinetic; Research Support, Non-U.S. Gov't |
| Subjects: | 320000 Medical and Health Sciences > 320900 Optometry |
| ID Code: | 4189 |
| Deposited By: | Bonham, Mark |
| Deposited On: | 14 June 2006 |
| Alternative Locations: | http://dx.doi.org/10.1016/S0042-6989(97)00446-X |
| Copyright Owner: | Copyright 1998 Elsevier |
| Additional Information: | For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: schmid.k@qut.edu.au |