"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. "
Esta es una imagen retocada, lo que significa que ha sido alterada digitalmente de su versión original. Modificaciones: Crop. La original se puede ver aquí: Olhos de um gato-2.jpg. Las modificaciones las hizo TimVickers.
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de compartir – de copiar, distribuir y transmitir el trabajo
de remezclar – de adaptar el trabajo
Bajo las siguientes condiciones:
atribución – Debes otorgar el crédito correspondiente, proporcionar un enlace a la licencia e indicar si realizaste algún cambio. Puedes hacerlo de cualquier manera razonable pero no de manera que sugiera que el licenciante te respalda a ti o al uso que hagas del trabajo.
compartir igual – En caso de mezclar, transformar o modificar este trabajo, deberás distribuir el trabajo resultante bajo la misma licencia o una compatible como el original.
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
((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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