Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Individual differences |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
The tapetum lucidum (Latin: "bright carpet") is a reflecting layer immediately behind, and sometimes within, the retina of the eye of many vertebrates and it serves to reflect light back to the retina, increasing the quantity of light caught by the retina. This improves vision in low light conditions, but can cause the perceived image to be blurry from the interference of the reflected light. It is therefore primarily found in nocturnal animals with good night vision, such as cats.
The reflective effect of the Tapetum lucidum is often called Eyeshine.
The tapetum lucidum is not present in the human eye, which is why humans have poor night vision. The red-eye effect in humans is due to the light from the camera flash reflecting off of the back of the eye in an instant (the retina, not a tapetum lucidum layer). In flash photographs, the eyes frequently appear to be glowing in one of a wide variety of colors including blue, green, yellow and pink. Bottlenose dolphins, dogs and deer also have a tapetum lucidum.
The tapetum works roughly on the interference principles of thin-film optics, as seen in other reflective tissues such as butterfly wings (see Blue Morpho). However, different species have different types of structured tissue that lead to different mechanisms of reflective interference (Ollivier 2004). Known tapetum structures include:
- Retinal tapetum in teleosts, crocodiles, marsupials and fruit bats.
- Choroidal guanine tapetum in elasmobranchii.
- Choroidal tapetum cellulosum in carnivores, rodents and cetacea.
- Choroidal tapetum fibrosum in cows, sheep, goats and horses.
- Ollivier, F.J. et al. "Comparative morphology of the tapetum lucidum (among selected species)", Veterinary Ophthalmology 2004 Jan–Feb;7(1):11–22. PMID: 14738502.
|Sensory system - Visual system - Eye - edit|
|Anterior chamber | Aqueous humour | Blind spot | Choroid | Ciliary body | Conjunctiva | Cornea | Iris | Lens | Macula | Optic disc | Optic fovea | Posterior chamber | Pupil | Retina | Schlemm's canal | Sclera | Tapetum lucidum | Trabecular meshwork | Vitreous humour|
|This page uses Creative Commons Licensed content from Wikipedia (view authors).|