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Night vision is of lower quality than day vision because it is limited in resolution and colors cannot be discerned; only shades of gray are seen. [1] In order for humans to transition from day to night vision they must undergo a dark adaptation period of up to two hours [ 2 ] in which each eye adjusts from a high to a low luminescence "setting ...
Color blindness changes the sensitivity of the eye as a function of wavelength. For people with protanopia , the peak of the eye's response is shifted toward the short-wave part of the spectrum (approximately 540 nm), while for people with deuteranopia , there is a slight shift in the peak of the spectrum, to about 560 nm. [ 17 ]
It is known that the rod cells are more suited to scotopic vision and cone cells to photopic vision, and that they differ in their sensitivity to different wavelengths of light. [ 2 ] [ 3 ] It has been established that the maximum spectral sensitivity of the human eye under daylight conditions is at a wavelength of 555 nm , while at night the ...
A rod cell is sensitive enough to respond to a single photon of light [11] and is about 100 times more sensitive to a single photon than cones. Since rods require less light to function than cones, they are the primary source of visual information at night (scotopic vision). Cone cells, on the other hand, require tens to hundreds of photons to ...
The resulting scene, which is apparently dark to a human observer, appears as a monochrome image on a normal display device. [13] Because active infrared night-vision systems can incorporate illuminators that produce high levels of infrared light, the resulting images are typically higher resolution than other night-vision technologies.
For example, binocular vision, which is the basis for stereopsis and is important for depth perception, covers 114 degrees (horizontally) of the visual field in humans; [7] the remaining peripheral ~50 degrees on each side [6] have no binocular vision (because only one eye can see those parts of the visual field). Some birds have a scant 10 to ...
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