Retinal
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  Retinal



Retinal

    Light-absorbing portion of rhodopsin. The absorption of light causes retinal to change from 11-cis to 11-trans configuration

RELATED TERMS
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Rhodopsin
The visual pigment in rod cells. Contains opsin and retinal.

Absorption
The way nutrients from food move from the small intestine into the cells in the body.

Retinal
Light-absorbing portion of rhodopsin. The absorption of light causes retinal to change from 11-cis to 11-trans configuration



SIMILAR TERMS
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Reticuloendothelial system
A network of phagocytic cells.

Retin-a
Retin-a is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): tretinoin.

Retin-a micro
Retin-a micro is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): tretinoin.

Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.

Retinal detachment
A retinal detachment occurs when the retina, that part of the eye that contains the photoreceptors, detaches from the underlying layers of cells, called the choroid. A retinal detachment my be the result of injury to the eye such as blunt trauma (remember Sugar Ray, the boxer) or it may result from other things like high myopia or age-related macular degeneration. In certain diseases, retinal breaks and tears occur and these may lead to a retinal detachment. Early warning signs include bright dots or lights or some of your side vision may appear dark. A retinal detachment may be treatable if detected early, so see your Ophthalmologist.

Retinal layers
Retinal layers are: Outer nuclear layer - Contains photoreceptors; Inner nuclear layer - Contains bipolar, horizontal and amacrine cells; Ganglion cell layer - Contains ganglion cells; Outer plexiform layer - Contains processes of receptor, bipolar and horizontal cells; Inner plexiform layer - Contains processes of bipolar, amacrine and ganglion cells.

Retinex Theory
Theory of lightness and color perception. Argues that the color of an object is not determined by the composition of the light coming from the object. The color of a unit area is determined by a trio of numbers each computed on a single waveband to give the relationship for the waveband between the unit area and the rest of the unit areas in a visual scene.

Retinitis
Inflammation of the retina.

Retinitis Pigmentosa (RP)


Retinoblastoma
The most common cancer in the eye occurring in early childhood. A parent or doctor may first suspect a problem by detecting whiteness in the normally dark pupil. Occasionally it leads to a wandering eye (strabismus). It does not spread from one eye to the other but about 25% have a tumor in each eye. Immediate medical treatment is necessary. Sometimes the eye(s) must be removed to prevent spreading of the tumor into the brain.

Retinoid
A natural or synthetic substance derived from vitamin A.

Retinopathy
Degeneration of the retina.

Retinotectal pathway
Pathway from the retina to superior colliculi.

Retinotopic map
A preservation of the spatial relationships of the photoreceptors in the retina in a higher brain representation.

Retisert
Retisert is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): fluocinolone acetonide.



PREVIOUS AND NEXT TERMS
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RU-486
An abortion-inducing pill, RU-486 works by blocking the action of progesterone, which is vital for maintaining a pregnancy. Effective only during the first seven weeks of pregnancy or up to five weeks after a missed period.

Rubella
A mild, highly contagious viral disease that can cause serious birth defects if a pregnant woman is afflicted. Women who haven't had it should make sure they're immunized before conception.

Receptive field
Area of the retina and visual space that when stimulated produces a change in the response rate of a neuron.

Reflectance
The fraction of incident light that is reflected toward the eye by an object.

Reflection densitometry
Technique applied to the living eye to study photopigments. Measures the light reflected from the fundus (i.e. not absorbed by any pigments).

Retinal

Retinal layers
Retinal layers are: Outer nuclear layer - Contains photoreceptors; Inner nuclear layer - Contains bipolar, horizontal and amacrine cells; Ganglion cell layer - Contains ganglion cells; Outer plexiform layer - Contains processes of receptor, bipolar and horizontal cells; Inner plexiform layer - Contains processes of bipolar, amacrine and ganglion cells.

Retinex Theory
Theory of lightness and color perception. Argues that the color of an object is not determined by the composition of the light coming from the object. The color of a unit area is determined by a trio of numbers each computed on a single waveband to give the relationship for the waveband between the unit area and the rest of the unit areas in a visual scene.

Retinotectal pathway
Pathway from the retina to superior colliculi.

Retinotopic map
A preservation of the spatial relationships of the photoreceptors in the retina in a higher brain representation.

Rhodopsin
The visual pigment in rod cells. Contains opsin and retinal.

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