The blindness is the state of a person blind man. The blindness term comes from the Latin word caecus .

Typology

The blind man, in a strict sense, which is that is private of its eyes ( ab oculis ), that which is private Vue. With this strict direction of total deprivation, one makes correspond a partial deprivation.

Thus, in the lawful direction French, blindness starts as soon as the acuity is lower than 1/20. They can thus as well be blind subjects, in a strict sense (subjects not having any visual perception), that subjects not being able to be regarded neither as blind men, because they have a calculable acuity and a certain visual potential, nor like partially-sighted persons, because this acuity is lower than 1/20.

In the same way, a person is regarded as Malvoyant E if it has in lower part of 3/10 of vision of the best eye after correction. This threshold varies according to the countries and the provinces. In Quebec for example, one considers that a person having a vision lower than 6/21 is reached of a visual deficiency.

Cortical blindness

The term of blindness is also employed to indicate the condition Neurologique which results from a destruction partial or total of the surfaces visual of the Cerveau. According to the site of the lesion, the patient can lose certain visual faculties.

Total cortical blindness is the most dramatic case resulting from a destruction of the visual Cortex Bilatéral. This condition so indicated under the anglophone term of blindsight translates into Vision plugs results in a total disablement for the patient to perceive the visual informations which come from alos to him as all the visual Système peripheral is in perfect operating condition. A functional exploration finer watch whereas certain faculties of vision can be preserved without the patient himself being aware of it. For example, the patient can adjust his hand to catch an object while at the same time it brings back itself nothing to perceive.

A partial blindness can be the result of a more restricted destruction of the visual territories. The patient suffers then from a Scotome, it is unable to perceive the visual informations coming from this area of space because the zone which treated this area was destroyed.

One uses also the blindness term in the expression word blindness which is a selective deficit in the Lecture of the Mot S generally resulting from an attack of the left occipito-temporal areas. Although its vision is perfect in addition, the patient is unable to read. In the case of a word blindness known as pure , the patient remains able to read the letter S but more the words while remaining able to write. One speaks then also about agnosia of verbal Alexie or word blindness without Agraphie.

Synonyms for the word blind man

The synonyms for the word “blind man” are “blind”, “Visually handicapped person” (and “defective of the sight”), “nonvoyant”.

See too

Internal bonds

• Eye trouble
• Onchocercose, in the poor countries
• Project: Audio articles
• Software of type screen reader

External references

• the OPC, Organization of the Prevention of Blindness
• the malvoyance

Simple: Blindness Zh-min-nan: Chheⁿ-me

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