Definitions for nyctalopia
ˌnɪk tlˈoʊ pi ənyc·talop·i·a

Princeton's WordNetRate this definition:0.0 / 0 votes

1. nyctalopia, night blindness, moon blindnessnoun

   inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder

WiktionaryRate this definition:0.0 / 0 votes

1. nyctalopianoun

   The inability to see clearly in dim light; night blindness

WikipediaRate this definition:0.0 / 0 votes

1. Nyctalopia

   Nyctalopia (; from Ancient Greek νύκτ- (núkt-) 'night', ἀλαός (alaós) 'blind, invisible', and ὄψ (óps) 'eye'), also called night-blindness, is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases. Night blindness may exist from birth, or be caused by injury or malnutrition (for example, vitamin A deficiency). It can be described as insufficient adaptation to darkness. The most common cause of nyctalopia is retinitis pigmentosa, a disorder in which the rod cells in the retina gradually lose their ability to respond to the light. Patients with this genetic condition have progressive nyctalopia and eventually, their daytime vision may also be affected. In X-linked congenital stationary night blindness, from birth the rods either do not work at all, or work very little, but the condition does not get worse. Another cause of night blindness is a deficiency of retinol, or vitamin A1, found in fish oils, liver and dairy products. The opposite problem, the inability to see in bright light, is known as hemeralopia and is much rarer. Since the outer area of the retina is made up of more rods than cones, loss of peripheral vision often results in night blindness. Individuals with night blindness not only see poorly at night but also require extra time for their eyes to adjust from brightly lit areas to dim ones. Contrast vision may also be greatly reduced. Rods contain a receptor-protein called rhodopsin. When light falls on rhodopsin, it undergoes a series of conformational changes ultimately generating electrical signals which are carried to the brain via the optic nerve. In the absence of light, rhodopsin is regenerated. The body synthesizes rhodopsin from vitamin A, which is why a deficiency in vitamin A causes poor night vision. Refractive "vision correction" surgery (especially PRK with the complication of "haze") may rarely cause a reduction in best night-time acuity due to the impairment of contrast sensitivity function (CSF) which is induced by intraocular light-scatter resulting from surgical intervention in the natural structural integrity of the cornea.

ChatGPTRate this definition:0.0 / 0 votes

1. nyctalopia

   Nyctalopia, also known as night blindness, is a condition characterized by difficulty seeing in low light or at night. It is often associated with certain vitamin deficiencies or specific eye conditions.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Nyctalopianoun

   a disease of the eye, in consequence of which the patient can see well in a faint light or at twilight, but is unable to see during the day or in a strong light; day blindness

2. Nyctalopianoun

   see Moonblink

3. Etymology: [L. nyctalopia, fr. nyctalops a nyctalops, Gr. nykta`lwps. Gr. nykta`lwps meant, a person affected either with day blindness or with night blindness, and in the former case was derived fr. ny`x, nykto`s, night + 'w`ps, 'wpo`s, the eye; in the latter, fr. ny`x + 'alao`s blind + 'w`ps.]

WikidataRate this definition:0.0 / 0 votes

1. Nyctalopia

   Nyctalopia also called "Night Blindness" is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases. Night blindness may exist from birth, or be caused by injury or malnutrition. It can be described as insufficient adaptation to darkness. The most common cause of nyctalopia is retinitis pigmentosa, a disorder in which the rod cells in the retina gradually lose their ability to respond to the light. Patients suffering from this genetic condition have progressive nyctalopia and eventually their daytime vision may also be affected. In X-linked congenital stationary night blindness, from birth the rods either do not work at all, or work very little, but the condition doesn't get worse. Another cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver and dairy products. The opposite problem, the inability to see in bright light, is known as hemeralopia and is much rarer. Since the outer area of the retina is made up of more rods than cones, loss of peripheral vision often results in night blindness. Individuals suffering from night blindness not only see poorly at night, but also require some time for their eyes to adjust from brightly lit areas to dim ones. Contrast vision may also be greatly reduced. Rods contain pigment called rhodopsin.when light falls on rhodopsin,it breaks for generating nerve impulse.In the absence of light,the breakdown products are again converted into rhodopsin.Body synthesize rhodopsin from vitamin A and that is why the defeciency of vitamin A causes poor night vision.This problem is called night blindness or Nyctalopia

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Nyctalopia

   nik-ta-lō′pi-a, n. the defective vision of persons who can see in a faint light but not in bright daylight: sometimes applied to the opposite defect, inability to see save in a strong daylight—also Nyc′talopy.—n. Nyc′talops, one affected with nyctalopia. [Gr. nyktalōps, seeing by night only—nyx, nyktos, night, ōps, vision.]

Dictionary of Nautical TermsRate this definition:0.0 / 0 votes

1. nyctalopia

   See MOON-BLINK.

Matched Categories

1. • Avitaminosis
   • Visual Impairment

Anagrams for nyctalopia »

1. polyactina

How to pronounce nyctalopia?

1. Alex

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   David

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   Mark

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   Daniel

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   Libby

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   Mia

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How to say nyctalopia in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of nyctalopia in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of nyctalopia in Pythagorean Numerology is: 8

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=nyctalopia
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Nyctalopia
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Nyctalopia
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/nyctalopia
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=nyctalopia
7. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=nyctalopia
8. ^ Dictionary of Nautical Terms
   https://www.gutenberg.org/cache/epub/26000/pg26000-images.html#:~:text=nyctalopia