A common kestrel can see ultraviolet light, meaning it can literally follow glowing vole trails of urine across a field. Nature’s night-vision goggles.

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A common kestrel can see ultraviolet light, meaning it can literally follow glowing vole trails of urine across a field. Nature’s night-vision goggles.
Vampire Eye range of vision: New Expanded information
[from my Hellsing Universe]
Vampire Third Eyelids (Old information)
There are thoughts about the third eye covering/lids and come to the conclusion Vampires have a third eyelid like cats in particular. Dangerous, sharp objects weirded by the more aggressive prey.
It's instinct in some to attack the eyes on anyone or anything. Or being a peasant burning down your home waving pitch forks.
The second use of the Nictitating membrane is the increased speed and those vampires that can remain humanoid with flight. It keeps eye irritation such as dust from entering the eyes. It keeps the vision completely clear for constant better vision.
#1455: “Insects can perceive a range of light far greater than that discernible by man. Most insects, for instance, can see ultraviolet light, and many varieties of beetles can see infrared. Insects are unable to focus their eyes, however, and can discern objects clearly only from several inches away. Most insects’ eyes are made up of tiny six-sided lenses, and sometimes (in the dragonfly, for instance) as many of those 30,000 of these lenses cover the retina. This means that insects do not perceive a single image, as humans do, but see a staggering number of separate images that, when combined, would appear to be of a colossal mosaic. Insects, furthermore, have no eyelids. Their eyes are always open.”
True.
To insects, their ultraviolet vision helps them distinguish different plants, especially those that need to be pollinated.
Insects have compound eyes, so called because their eyes are made up of many different seeing units (called ommatidia) crammed together. Each unit has a lens, which contributes one pixel to the insect’s vision. The insect sees a pixelated image, not multiple images as is commonly assumed. Insects do not have eyelids since they don’t need to protect their eyes like humans do.
Beetles who lay their eggs in freshly burnt wood use their infrared vision to find forest fires.