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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Retinal artery, central Retinal artery, central
    Retinal artery, central: The blood vessel that carries blood into the eye and supplies nutrition to the retina. The counterpart to the central retinal artery is the central retinal vein, the vessel that carries blood away from the retina....
  2. Retinal detachment Retinal detachment
    Retinal detachment: A separation of the retina from its connection at the back of the eye. The separation usually results from a tear (that is, a rent or rip, not a tear drop) in the retina. The tear often occurs when the vitreous gel pulls loose or separates from its attachment to the retina, ...
  3. Retinal disease Retinal disease
    Retinal disease: In medicine, called retinopathy. See: Retinopathy....
  4. Retinal electrophysiologic testing Retinal electrophysiologic testing
    Retinal electrophysiologic testing: See: Electrophysiologic retinal testing ....
  5. Retinal fundus Retinal fundus
    Retinal fundus: The interior lining of the eyeball, including the retina (the light-sensitive screen), optic disc (the head of the nerve to the eye), and the macula (the small spot in the retina where vision is keenest). The fundus is the portion of the inner eye that can be seen during an eye exami...
  6. Retinal pigment epithelium Retinal pigment epithelium
    Retinal pigment epithelium: The pigment cell layer that nourishes the retinal cells. The retinal pigment epithelium is located just outside the retina and is attached to what is called the choroid, a layer filled with blood vessels that nourish the retina....
  7. Retinal vasculitis Retinal vasculitis
    Retinal vasculitis: The retina is the portion of the eye that contains the nerves of sensation that perceive light. It is also filled with tiny blood vessels. Vasculitis of the eye is typically the result of inflammation of the tiny blood vessels of the retina. This form of vasculitis is referred ...
  8. Retinal vein, central Retinal vein, central
    Retinal vein, central: The blood vessel that carries blood away from the retina of the eye. The counterpart to the central retinal vein is the central retinal artery, the blood vessel that carries blood into the eye and supplies nutrition to the retina....
  9. Retinal wrinkling Retinal wrinkling
    Retinal wrinkling: See: Macular pucker....
  10. Retinitis pigmentosa Retinitis pigmentosa
    Retinitis pigmentosa: Any one of a large group of inherited disorders in which abnormalities of the photoreceptors (the rods and cones) in the retina lead to progressive visual loss. People with retinitis pigmentosa (RP) first experience defective dark adaptation ("night blindness"), then constric...
  11. Retinitis pigmentosa and congenital deafness Retinitis pigmentosa and congenital deafness
    Retinitis pigmentosa and congenital deafness: (Also called Usher syndrome.) A genetic disorder characterized by hearing impairment and an eye disorder called retinitis pigmentosa in which vision worsens over time. Some people with Usher syndrome also have balance problems. It is the most common dis...
  12. Retinoblastoma Retinoblastoma
    Retinoblastoma: A malignant eye tumor in children, usually under age 5, that arises in cells in the developing retina containing cancer-predisposing mutations in both copies of the gene RB1. The most common sign of retinoblastoma (RB) is a white pupillary reflex to light (leukocoria). Strabismus (a ...
  13. Retinoic acid syndrome Retinoic acid syndrome
    Retinoic acid syndrome: A syndrome that occurs from treatment with retinoic acid and is characterized by fever, dyspnea (difficulty breathing), chest pain, lung infiltrates evident on chest X-ray, pleural and pericardial effusions (fluid around the lungs and heart) and hypoxia (lack of oxygen). Th...
  14. Retinoid Retinoid
    Retinoid: 1. Vitamin A (retinol) or a naturally occurring or synthetic substance chemically related to it. (Retinoid literally means "like retinol.") 2. In ophthalmology, resembling the retina....
  15. Retinol Retinol
    Retinol: Retinol is vitamin A. Carotene compounds (found, for example, in egg yolk, butter and cream) are gradually converted by the body to vitamin A (retinol). A form of vitamin A called retinal is responsible for transmitting light sensation in the retina of the eye. Deficiency of vitamin A lead...