File:Olhos de um gato-3.jpg
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Size of this preview: 630 × 600 pixels. Other resolutions: 252 × 240 pixels | 504 × 480 pixels | 806 × 768 pixels | 1,075 × 1,024 pixels | 1,657 × 1,578 pixels.
Original file (1,657 × 1,578 pixels, file size: 1.9 MB, MIME type: image/jpeg)
| Description | "Unlike human eyes, which work best in daylight, the cat’s eyes must function well in extremely low light conditions and as such are well suited to an animal that is predominantly nocturnal and crepuscular in activity. In darkness, cats' eyes are able to function in approximately one-sixth of the light needed for human vision. However, they must also be able to function well in daylight – so just how is this achieved? In low light levels the cat's pupil must be able to open as wide as possible, but also be able to contract to very small size to protect the sensitive retina in bright sunlight. In human eyes, this size variation of the pupil is controlled by a circular ciliary muscle, but this limits the amount of size variation. In cats however, the same process is controlled by two, shutterlike ciliary muscles, which gives the cat its characteristic slitlike pupil in bright light conditions. " |
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Crop. The original can be viewed here: Olhos de um gato-2.jpg:  . Modifications made by TimVickers.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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Original upload log
This image is a derivative work of the following images:
- File:Olhos_de_um_gato-2.jpg licensed with Cc-by-sa-2.0, Cc-by-sa-2.0
- 2009-08-25T22:43:20Z Tm 1789x1604 (2254532 Bytes) {{Information |Description="Unlike human eyes, which work best in day light, the cat’s eyes must function well in extremely low light condition and as such are well suited to an animal that is predominantly nocturnal a
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:00, 27 August 2009 | | 1,657 × 1,578 (1.9 MB) | wikimediacommons>TimVickers | {{Information |Description="Unlike human eyes, which work best in day light, the cat’s eyes must function well in extremely low light condition and as such are well suited to an animal that is predominantly nocturnal and crepuscular in activity. In |
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