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| This glossary contains: 19186 medical terms |
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Rod cone dystrophy
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Rod cone dystrophy A number of retina diseases in which the rod photoreceptors first start to degenerate followed by the cone photoreceptors. Other parts of the retina and RPE are also adversely affected. Symptoms include loss of side vision and night blindness followed by the loss of central vision. RP is the most common form of rod-cone degeneration. Some forms occur at birth while other forms may start much later in life. Generally very poor prognosis.
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.
Cone
One of the two light receiving retinal cells (the other is the rod) that is responsible for daylight vision (e.g., color vision, high visual acuity, bright light vision). The area of the retina that provides central or reading vision, known as the fovea, contains only cones.
Vision
The sense of sight.
Blindness
Legal blindness is defined as: 1) visual acuity of 20/200 (only being able to see the big E on the eye chart) or less in the best eye even with the eyes corrected by glasses or contact lenses; or, 2) The peripheral visual field is reduced to 20 degrees of visual angle or less. Twenty degrees of visual angle is about the size of a one foot ruler held at arms length.
Central
In anatomy and medicine (as elsewhere), central is the opposite of "peripheral" which means away from the center.
Prognosis
The anticipated outcome of treatment.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Ritchie index
A scoring system for recording joint tenderness.
Refraction
In order for an eye to see clearly, the light rays must come to a perfect focus when they reach the fovea. The bending of the light rays is called refraction. Each eye has its own characteristic refractive error. An instrument (retinoscope) is used to determine this error. The examination is called refracting the eye. From the refraction, the examiner learns the strength of lens necessary to provide the clearest vision for each eye.
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.
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.
Retrobulbar neuritis
An inflammation of the optic nerve. It causes a loss in vision. It is sometimes indicative of a neurological disease.
Rod cone dystrophy
Rods
The rods are the visual cells of the retina that are important for night vision and peripheral vision. The rods are the first affected in rod-cone degenerations such as RP.
Ranidae
The family of true frogs of the order Anura. The family occurs worldwide except in Antarctica.
Ranide
Veterinary anthelmintic for grazing animals; used to treat fluke, hookworm and other infestations.
Ruminant
A suborder of the order Artiodactyla whose members have the distinguishing feature of a four-chambered stomach. Horns or antlers are usually present, at least in males.
Ruminantia
A suborder of the order Artiodactyla whose members have the distinguishing feature of a four-chambered stomach. Horns or antlers are usually present, at least in males.
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.
Cone
One of the two light receiving retinal cells (the other is the rod) that is responsible for daylight vision (e.g., color vision, high visual acuity, bright light vision). The area of the retina that provides central or reading vision, known as the fovea, contains only cones.
Vision
The sense of sight.
Blindness
Legal blindness is defined as: 1) visual acuity of 20/200 (only being able to see the big E on the eye chart) or less in the best eye even with the eyes corrected by glasses or contact lenses; or, 2) The peripheral visual field is reduced to 20 degrees of visual angle or less. Twenty degrees of visual angle is about the size of a one foot ruler held at arms length.
Central
In anatomy and medicine (as elsewhere), central is the opposite of "peripheral" which means away from the center.
Prognosis
The anticipated outcome of treatment.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Ritchie index
A scoring system for recording joint tenderness.
Refraction
In order for an eye to see clearly, the light rays must come to a perfect focus when they reach the fovea. The bending of the light rays is called refraction. Each eye has its own characteristic refractive error. An instrument (retinoscope) is used to determine this error. The examination is called refracting the eye. From the refraction, the examiner learns the strength of lens necessary to provide the clearest vision for each eye.
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.
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.
Retrobulbar neuritis
An inflammation of the optic nerve. It causes a loss in vision. It is sometimes indicative of a neurological disease.
Rod cone dystrophy
Rods
The rods are the visual cells of the retina that are important for night vision and peripheral vision. The rods are the first affected in rod-cone degenerations such as RP.
Ranidae
The family of true frogs of the order Anura. The family occurs worldwide except in Antarctica.
Ranide
Veterinary anthelmintic for grazing animals; used to treat fluke, hookworm and other infestations.
Ruminant
A suborder of the order Artiodactyla whose members have the distinguishing feature of a four-chambered stomach. Horns or antlers are usually present, at least in males.
Ruminantia
A suborder of the order Artiodactyla whose members have the distinguishing feature of a four-chambered stomach. Horns or antlers are usually present, at least in males.
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This dictionary contains 19186 terms.
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