Tapetum lucidum in a Carrier of X-Chromosomal Atrophia retinae pigmentosa

2015 ◽  
pp. 247-248
Author(s):  
J. G. Breebaart-de Miranda
Keyword(s):  
Tapetum Lucidum

The tapetum lucidum in the eye of the big-eye Priacanthus arenatus Cuvier

1973 ◽  
Vol 5 (4) ◽  
pp. 519-522 ◽  
Author(s):  
J. A. C. Nicol ◽  
E. S. Zyznar
Keyword(s):  
Tapetum Lucidum

Histological study of choroidal melanocytes in animals with tapetum lucidum cellulosum

1990 ◽  
Vol 228 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Taeko Chijiiwa ◽  
Tatsuro Ishibashi ◽  
Hajime Inomata
Keyword(s):  
Histological Study ◽  
Tapetum Lucidum

scholarly journals Shifting mirrors: adaptive changes in retinal reflections to winter darkness in Arctic reindeer

2013 ◽  
Vol 280 (1773) ◽  
pp. 20132451 ◽  
Author(s):  
Karl-Arne Stokkan ◽  
Lars Folkow ◽  
Juliet Dukes ◽  
Magella Neveu ◽  
Chris Hogg ◽  
...  
Keyword(s):  
Retinal Sensitivity ◽  
Structural Adaptation ◽  
Deep Blue ◽  
Environmental Light ◽  
Tapetum Lucidum ◽  
Increased Sensitivity ◽  
Ocular Pressure ◽  
The Cost ◽  
Unique Mechanism ◽  
Scatter Light

Arctic reindeer experience extreme changes in environmental light from continuous summer daylight to continuous winter darkness. Here, we show that they may have a unique mechanism to cope with winter darkness by changing the wavelength reflection from their tapetum lucidum (TL). In summer, it is golden with most light reflected back directly through the retina, whereas in winter it is deep blue with less light reflected out of the eye. The blue reflection in winter is associated with significantly increased retinal sensitivity compared with summer animals. The wavelength of reflection depends on TL collagen spacing, with reduced spacing resulting in shorter wavelengths, which we confirmed in summer and winter animals. Winter animals have significantly increased intra-ocular pressure, probably produced by permanent pupil dilation blocking ocular drainage. This may explain the collagen compression. The resulting shift to a blue reflection may scatter light through photoreceptors rather than directly reflecting it, resulting in elevated retinal sensitivity via increased photon capture. This is, to our knowledge, the first description of a retinal structural adaptation to seasonal changes in environmental light. Increased sensitivity occurs at the cost of reduced acuity, but may be an important adaptation in reindeer to detect moving predators in the dark Arctic winter.

Notes on the retina and tapetum lucidum of Howella (Teleostei: Cheilodipteridae)

1978 ◽  
Vol 58 (3) ◽  
pp. 735-738 ◽  
Author(s):  
A. C. G. Best ◽  
J. A. C. Nicol
Keyword(s):  
Photoreceptor Layer ◽  
Tapetum Lucidum ◽  
Diffuse Reflector

The structure of the retina and tapetum lucidum of the teleost Howella is described. The tapetum is a diffuse reflector composed of lipid spheres. The photoreceptor layer of the retina contains only rods; in section the rods appear segmented, perhaps arranged in stacks but their precise arrangement remains to be determined.

Uric acid in the tapetum lucidum of mooneyes Hiodon (Hiodontidae Teleostei)

1978 ◽  
Vol 201 (1142) ◽  
pp. 1-6 ◽  
Keyword(s):  
Uric Acid ◽  
Pigment Epithelium ◽  
Tapetum Lucidum ◽  
Birefringent Crystals

Tapeta lucida (ocular reflectors) of mooneyes, Hiodon tergisus and H. alosoides , lie in the pigment epithelium, the processes of which are packed with reflecting particles and also contain melanin granules. The reflecting particles are tiny birefringent crystals. On the basis of chromatography, u. v. spectroscopy and enzymic degradation (with uricase), it is concluded that the reflecting material contains uric acid. Mooneye tapeta are compared with those of other teleosts.

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