retinal

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Related to retinal photoreceptor layer: Phototransduction

retinal

 [ret´ĭ-nal]
1. pertaining to the retina.
2. the aldehyde of retinol, having vitamin A activity. One isomer (11-cis-retinal) combines with opsin in the retinal rods (scotopsin) to form rhodopsin (visual purple); another, all-trans-retinal, or visual yellow, results from the bleaching of rhodopsin by light, in which the 11-cis form is converted to the all-trans form. Retinal also combines with opsins in the retinal cones to form the three pigments responsible for color vision.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ret·i·nal

(ret'i-năl),
1. Relating to the retina.
2. Retinaldehyde, most commonly referring to the all-trans form; participates in the visual process; 11-cis-retinal binds with an opsin to form iodopsin or rhodopsin; light causes the formation of all-trans-retinal, which dissociates from the protein.
Farlex Partner Medical Dictionary © Farlex 2012

retinal 1

(rĕt′n-ăl′)
adj.
Of or relating to the retina of the eye.

retinal 2

(rĕt′n-ăl′, -ôl′)
n.
Either of two chromophores that are aldehydes of vitamin A1 and vitamin A2 and that bind covalently with an opsin protein to form rhodopsin or porphyropsin. Also called retinene.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

retinal

adjective Referring to the retina noun 11-cis-retinal, vitamin A aldehyde A retinal pigment that absorbs visible light at 400-600 nm, resulting in an isomeric transition of the 11-cis-retinal moiety to a trans-retinal conformation causing a G protein-mediated depolarization event
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

ret·i·nal

(ret'i-năl)
1. Relating to the retina.
2. Retinaldehyde; most commonly referring to the all-trans form.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

retinal

The aldehyde found in visual pigments, such as visual purple. Also known as retinaldehyde.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

retinal 

1. Pertaining to the retina.
2. See rhodopsin.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann