congenital night blindness definition of congenital night blindness in the Free Online Encyclopedia.

night blindness, inability to see normally in subdued light. It is usually a result of vitamin A deficiency. The rod cells, one of two light-sensitive areas of the retina of the eye eye, organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many
..... Click the link for more information. , are impaired in their capacity to produce a chemical compound called rhodopsin, or visual purple, that is necessary for the perception of objects in dim light. Consequently, the visual threshold, or the minimum intensity of light necessary for sight, is greatly increased. Folk medicine has long recognized the role of the ingestion of liver in alleviating the condition, but it was not until the first quarter of the 20th cent. that vitamin A was identified as the crucial element. Treatment of night blindness consists of the oral or intravenous administration of vitamin A.

night blindness [′nīt ‚blīnd·nəs]

(medicine)

Reduced dark adaptation resulting from vitamin A deficiency or from retinitis pigmentosa or other peripheral retinal disease. Also known as nyctalopia.

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Congenital myasthenia gravis
Congenital myasthenia gravis
Congenital myasthenic syndrome
Congenital Myasthenic Syndrome Associated with Episodic Apnea
Congenital Myasthenic Syndrome with episodic Apnea
Congenital Myasthenic Syndrome, Type IIA
Congenital myotonia
Congenital myotonia
Congenital myotonic dystrophy
Congenital myotonic dystrophy
Congenital myotonic dystrophy
Congenital Myotonic Muscular Dystrophy
congenital myotonic myopathy
congenital myotonic myopathy
congenital myotonic myopathy
congenital myxedema
congenital myxedema
congenital myxedema
Congenital Nasal Piriform Aperture Stenosis
Congenital Nasolacrimal Duct Obstruction
Congenital Nasolacrimal System Obstruction
Congenital Nephrogenic Diabetes Insipidus
Congenital Nephrosis Finnish
Congenital nephrotic syndrome
Congenital Nephrotic Syndrome of Finnish Type
congenital neutropenia
congenital neutropenia
congenital neutropenia
congenital nevus
Congenital Nevus-Like Nevi

congenital night blindness

Congenital Non-Spherocytic Haemolytic Anaemia
Congenital Nonbullous Ichthyosiform Erythroderma
congenital nonspherocytic hemolytic anemia
congenital nonspherocytic hemolytic anemia
congenital nonspherocytic hemolytic anemia
Congenital Nonspherocytic Hemolytic Disease
congenital nystagmus
congenital nystagmus
congenital nystagmus
congenital nystagmus
congenital oculofacial paralysis
Congenital Oculomotor Apraxia
congenital of newborn epulis
congenital of newborn epulis
congenital of newborn epulis
Congenital Onychodysplasia of the Index Finger
Congenital Optic Nerve Hypoplasia
Congenital or Early-Onset Hearing Impairment
Congenital osteosclerosis
Congenital osteosclerosis
Congenital osteosclerosis
Congenital Ovine Neuronal Ceroid Lipofuscinosis
Congenital Pain Insensitivity
congenital pancytopenia
congenital pancytopenia
congenital paralysis
congenital paralysis
congenital paralysis
congenital paralysis
congenital paramyotonia

night blindness (redirected from congenital night blindness)

night blindness
(redirected from congenital night blindness)