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Retinopathy
Retinopathy Degeneration of the retina.
RELATED TERMS--------------------------------------
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.
SIMILAR TERMS--------------------------------------
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
Light-absorbing portion of rhodopsin. The absorption of light causes retinal to change from 11-cis to 11-trans configuration
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)
A hereditary condition resulting in degeneration of the retina; causes a narrowing of the field of vision. The visual field loss often begins as a donut like ring in mid-periphery. As it progresses both centrally and peripherally, the resultant tunnel vision begins to affect the patient’s activities, driving and mobility.
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.
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--------------------------------------
Remedy
Anything that cures.
Remission
Improvement of the symptoms of a disease.
Reservoir
A medical term used to describe a source of organisms causing a disease.
Respiration
The act or process of breathing. The process by which a living organism or cell takes in oxygen from the air or water and uses it.
Retardation
Delay or halt of any process such as mental or physical development.
Retinopathy
Retrobulbar
Behind the eyeball.
Retrovirus
A virus that produces DNA from RNA (the opposite of the normal order). A group of viruses that includes HIV.
Rh factor
One of the antigens present on red blood cells. Used in categorizing the type of blood a person has.
Rhinoplasty
Plastic surgery of the nose.
Rhinorrhea
Runny nose.
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