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The normal human observer's relative wavelength sensitivity will not change due to background illumination under scotopic vision. The wavelength sensitivity is determined by the rhodopsin photopigment. This is a red pigment seen at the back of the eye in animals that have a white background to their eye called Tapetum lucidum.
The dark blue, teal, and gold tapetum lucidum from the eye of a cow Retina of a mongrel dog with strong tapetal reflex. The tapetum lucidum (Latin for 'bright tapestry, coverlet'; / t ə ˈ p iː t əm ˈ l uː s ɪ d əm / tə-PEE-təm LOO-sih-dəm; pl.: tapeta lucida) [1] is a layer of tissue in the eye of many vertebrates and some other animals.
The tapetum lucidum, in animals that have it, can produce eyeshine, for example as seen in cat eyes at night. Red-eye effect, a reflection of red blood vessels, appears in the eyes of humans and other animals that have no tapetum lucidum, hence no eyeshine, and rarely in animals that have a tapetum lucidum. The red-eye effect is a photographic ...
Humans, and monkeys, lack a tapetum lucidum. [8] [9] The pupil of the eye dilates in the dark to enhance night vision. Shown here is a pupil of an adult naturally dilated to 9 mm in diameter in mesopic light levels. The average human eye is not able to dilate to this extent without the use of mydriatics.
Leukocoria (also white pupillary reflex) is an abnormal white reflection from the retina of the eye. Leukocoria resembles eyeshine, but leukocoria can also occur in animals that lack eyeshine because their retina lacks a tapetum lucidum.
Most nocturnal vertebrates have a reflecting tapetum lucidum behind the retina, which produces the 'eyeshine' seen in cats and dogs. Incoming photons that are not absorbed by the photoreceptors are reflected back, increasing their chances of being absorbed and generating nerve signals.
Look at the inner corner of your eye in a mirror. That pink thing is your tapeum ludicum.(caruncle, not tapetum lucidum). Could someone supply a citation that verifies humans have but can't use a tapetum; a letter in "nature" contradicts this directly. We do not possess tapatum lucidum, and we or them do not have to option to/ not to use it.
The tapetum lucidum of a galago, typical of prosimians, reflects the light of the photographer's flash. Being an evolutionary grade rather than a clade, the prosimians are united by being primates with traits otherwise found in non-primate mammals.