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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.
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.
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Lycosoidea is a clade or superfamily of araneomorph spiders.The traditional circumscription was based on a feature of the eyes. The tapetum is a reflective layer at the back of the eye, thought to increase sensitivity in low light levels.
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 ...
This is found in many nocturnal animals and some deep sea animals, and is the cause of eyeshine. 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 ...
In my experience, yellow and green eyeshine occurs in (cats at least with) yellow and green eyes, while blue eyes produce pink eyeshine. Keep in mind that our color vision gets worse in the dark. — Preceding unsigned comment added by 75.73.70.113 ( talk ) 21:12, 28 June 2012 (UTC) [ reply ]
The tapetum lucidum is a retroreflective tissue found in eyes. This reflective tissue is only found in four [3] secondary eyes of the wolf spider. Flashing a beam of light over the spider produces eyeshine; this eyeshine can be seen when the lighting source is roughly coaxial with the viewer or sensor. [4]