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Rare disease: What you need to know about Night Blindness – view

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Tuesday, February 05, 2019

A true night blindness is a very rare disease. Nevertheless, many people look bad, when it is dark. Mostly, but that is something other than a Hemeralopie, such as night-blindness is known in the technical jargon.

Thus, an impaired tear film, a Short – or far-sightedness, or a cloudiness of the lens is behind most cases of alleged impairment of vision. The decreased visual acuity is the rule, rather the manifestation of a different disease.

In fact, a decreased visual performance in the dark can also be a Symptom of a “real” night-blindness. As Hemeralopie a very rare network is referred to skin disease. Such is, see to be Concerned at night significantly worse or nothing at all – they are night blind.

Different causes: Night blindness  due to Vitamin A deficiency in Europe is extremely rare. Also night blindness can occur as a result of another disease such as Diabetes mellitus and usually both eyes are affected

At the periphery of the retina there are more rods than cones. These are the sticks that can see when the light is dim. As a result, most people whose peripheral visual field is degraded are affected by night blindness.

The hemeralopes are not only disabled at night or when the light is dim. Their eyes also need a very long time to adapt from the brightness to the darkness or low lighting of a room. In addition, their perception of contrasts is greatly diminished.

The disease is very rare. Just one of an estimated 22’000 people is affected by hereditary night blindness. Depending on what causes the Hemeralopie, to the disease from birth or develops in the course of time.

Diagnosis and treatment:

Often may be sufficient in a conversation with the doctor to make the diagnosis of night blindness. In addition, the skilled person can measure with different devices, the vision of the eyes in the darkness. The diagnosis is made only once, has yet to be found out what type of night blindness is. To do this, the doctor examines the retina and is related receptors.

The treatment depends to a large extent, what is the cause of the visual impairment. If the reason is a lack of Vitamin A, it can be well treated if Vitamin A is taken.

It is Difficult when the Hemeralopie is innate. In this case, no therapy can fix the causes. This means that hereditary night-blindness is incurable, and cannot be corrected by glasses.

Author: Adrian McDonald
Source: kxan36
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