What adaptations to a mammal's eyes would allow it to see large contrasts well, and what other effects would those have?
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There is a nocturnal mammal, about the size of a common red fox, which has evolved (by way of some unspecified-at-this-point selective pressure) the ability to see well in situations involving large contrasts. More specifically, an ability to make out details in areas with large differences in luminosity subtending very small angles as seen from the creature's point of view.
Something like: If you point a flashlight at it at night, it is able to make out not just the lamp in the flashlight, but also your fingers grasping the flashlight, from some non-negligible distance.
Two questions:
- What adaptations to the creature's eyes (and more generally its visual system) would allow such vision?
- What other effects on the creature's eyesight might (would) those adaptations have?
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