The Night time world is never closed for nocturnal animals. Unlike humans, many animals possess adaptations that allow them to see even when the night sky is very dark. Animals have developed amazing adaptations to their environments.
Night vision is the ability to see in a dark environment. Night vision is mainly due to two adaptive features.1. Sufficient spectral range2. Sufficient intensity range.
Night Vision
Spectral range
Human vision is confined to a small portion of the electromagnetic spectrum called visible spectrum. It extends between 450 and 750 nanometerswavelengths. Below 450 nm is the Ultraviolet spectrum and above 750 nm is theInfrared spectrum. Some animals can see using the infrared or ultraviolet spectrum.
Intensity range
Sufficient intensity range is the ability to sense very small quantities of light. Although humans can detect single photons under ideal conditions, the neurological noise filters limit sensitivity to a few tens of photons.
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