that the feline is the most sensual of all mammals. While its smell and hearing may not be as keen as, say, those of a mouse, its highly advanced eyesight and superior (by human standards) aural (sound) and olfactory (smell) senses combine with highly evolved taste and touch receptors to make the cat arguably the most sensitive of any mammal. Measuring the senses of any animal can be difficult, because there is usually no explicit communication (e.g., reading aloud the letters of a Snellen chart) between the subject and the tester. However, testing indicates that a cat's vision is superior at night in comparison to humans, and inferior in daylight.
http://encyclopedia.thefreedictionary.com/Cat

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The Snellen Chart:
beachguy in thongs Reviewed by beachguy in thongs on . I love my pussy. Zoologists believe... that the feline is the most sensual of all mammals. While its smell and hearing may not be as keen as, say, those of a mouse, its highly advanced eyesight and superior (by human standards) aural (sound) and olfactory (smell) senses combine with highly evolved taste and touch receptors to make the cat arguably the most sensitive of any mammal. Measuring the senses of any animal can be difficult, because there is usually no explicit communication (e.g., reading aloud the letters of a Snellen Rating: 5