Achromatopsia
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  Achromatopsia



Achromatopsia

    Characterized by a lack of color vision with poor visual acuity, nystagmus, and sensitivity to sunlight. No treatment is available except, for example, sunglasses for the sensitivity to light.

RELATED TERMS
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Vision
The sense of sight.

Acuity
The highest spatial frequency rsolvable with a grating of unity contrast (i.e. the maximum possibly contrast).

Nystagmus
Nystagmus is a rhythmic, repetitive, oscillatory eye movement. It may occur as a result of vestibular problems, as a result of visual problems, or as a result of certain brain stem or cerebellar abnormalities. Vestibular Nystagmus is characterized by a slow migration of the eyes in the wrong direction, followed by a sudden jerking back response.

Sensitivity
1. The reciprocal of the minimum stimulus strength required for the stimulus to be detected reliably (1/threshold) May be related to noise and other mechanisms. 2. Physiologically measured sensitivity averaged over many stimulus/response cycles. A measure of gain. Noise free.



SIMILAR TERMS
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Achromatium
A large group of aerobic bacteria which show up as pink (negative) when treated by the gram-staining method.

Achromobacter
A genus of gram-negative, aerobic, motile bacteria that occur in water and soil. Some are common inhabitants of the intestinal tract of vertebrates. These bacteria occasionally cause opportunistic infections in humans.

Achromycin
See: Tetracycline.

Achromycin v
Achromycin v is a prescription or over-the-counter drug which is (or once was) legal in the United States and possibly in other countries. Active ingredient(s): tetracycline hydrochloride.

Achromycin V
An antibiotic originally produced by Streptomyces viridifaciens, but used mostly in synthetic form. It is an inhibitor of aminoacyl-tRNA binding during protein synthesis.



PREVIOUS AND NEXT TERMS
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Apresoline
A periferal vasodilator made by Novartis and based on hydralazine.

Aquasite
A medicine produced by Novartis and providing up to two hours of longer-lasting hypotonic relief.

Anorexia
A condition in which a person doesnít eat normally. This severe eating disorder is associated with a need for control and severe weight loss, amenorrhea, high cortisol levels, bone loss and the metabolic effects of undernutrition.

Accommodation
In younger people, under age 40, the lens is adjusted by the ciliary muscles to focus clearly for near as well as far vision. With age the lens is less able to change, eventually requiring reading glasses or bifocals for close work.

Achromatopsia

Age Related Macular Degeneration
The most common form of macular degeneration is Age-related Macular Degeneration (ARMD). It is believed that one contributing factor of ARMD is excessive light exposure over a personís lifetime. Limiting excessive light exposure (e.g., wearing sunglasses and a hat outside) and a diet rich in antioxidants as well as zinc may prevent or retard the development of ARMD. In general, the lighter a personís complexion the greater the risk of ARMD.

Albinism
A hereditary condition in which darker pigment fails to form in the eye, hair and skin. In ocular albinism, visual acuity ranges from 20/40 to 20/200 (legal blindness), the eyes may dance (nystagmus) and the person is very sensitive to sunlight. No treatment is available, except dark sunglasses for the photophobia.

Angioid Streaks
Fragmentation of Bruchís membrane due to the degeneration of the elastic layers and development of subretinal fibrovascular tissue. Sometimes does not cause vision problems; however, can cause a reduction of visual acuity leading to legal blindness. Often associated with another disease such as sickle cell disease and certain syndromes.

Aniridia
A hereditary eye problem in which the iris, the colored part of the eye, is absent. There is poor vision, sensitivity to sunlight, nystagmus, and a tendency to develop glaucoma.

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