Genetic diseases



colorblindness photo blindness - impaired ability to perceive certain colors having a hereditary nature, or caused by diseases of the retina or optic nerve.Retinal nerve cells called layer having an ability to transmit and receive light further information received by the optic nerve to the brain.The first color-blindness was described by John Dalton in 1794, who himself suffered from partial color blindness, and did not distinguish the red color (as well as his two brothers).According to statistics blindness observed in 0.5% of women and 8% of men.When color blindness in humans lost the ability to distinguish between green, blue, red color (sometimes several).In the retina there are three kinds of sensing a certain (blue, green, red) color cone cells.In the event of activity or complete absence of cone cell type, human eye loses its ability to distinguish exactly the color, the responsibility for which they are.The highest density of cone cells were observed in the central part of the retina, thereby p

roviding a bright color vision

Blindness - Causes of

In most of recorded cases to the causes of color blindness include genetic factors (congenital blindness) as a violation of color perception has been observed withthe moment of birth.Much rarer acquired color blindness, which is caused by the natural aging process, diseases of the optic nerve, eye injuries and other reasons.The color vision problem is most common in people of male

blindness - the signs and symptoms

Blindness directly affects the quality of life.The color vision problem affects not only the processes of reading and learning, but also in the future, significantly reduces the possibility of a professional choice.Despite this both adult patients and children are able to compensate for the inability to distinguish between certain colors.

Symptoms of color blindness over time in a state of change and different people may see a totally different shades of colors.In most cases, people with color blindness does not distinguish between blue, green and red colors.In less serious problems that a person can see the yellow or blue.But the most serious disorders of color vision people can not even distinguish any colors and the world they see in black and white, with various shades of gray derivatives.

In the case of hereditary nature of color blindness, vision problems observed simultaneously in both eyes.In the case of acquired character disorders, problems may occur in only one eye.There are cases when one eye is affected stronger than the other.Hereditary pathology of color vision are often observed at birth and over time generally does not change.Acquired pathology in contrast, may be aggravated or modified for a sufficiently long period of time, due to age-related changes, or the presence of certain diseases in humans

types of inherited color blindness

There are four main types of color blindness:

Dihromasiya .This problem can occur in the complete absence of any of the 3 types of cone shells.Most often, patients suffering dihromasiey no problem determining the difference between the yellow and blue colors, but the difference between green and red to such people is much more difficult

Abnormal trihromasiya .This condition is the most common pathology of color vision.It occurs in people who have all three types of cone shells, one of which has the disadvantage of pigments for color perception.People with abnormal trihromasiey see all the colors, only a few (blue, red, green), they see a completely different shade than those who do not suffer a violation of color perception

Blue Cone monohromasiya .When the pathology of three possible missing two cone crushers - green and red.This type of disease is found only in men.Of all the diverse color spectrum, people with blue cone monohromasiey able to distinguish only the blue color + shades.People with this disease is bad enough seeing at a distance.In young boys may occur nystagmus (involuntary eye movement)

Achromatopsia (monohromasiya retinal rods) .In this type of violation of color vision in humans lacking all three types of cones of the cone.The presence of this pathology allows a person to see only shades of gray, white and black colors.Patients with this type of disease is often detected, and other eye diseases, they do not see at a distance, when reading them quite blurry vision, there is a high sensitivity to light.Although the violation found and the most rare, it is the most serious of all

acquired blindness

The causes of acquired color blindness include a number of different manifestations.To one of the causes of this disease include age-related changes, in which there is a darkening of the lens.Because of this process, people are very badly distinguished dark gray, dark green and dark blue colors.Sometimes the color perception can be broken consequently the side effects of certain medicines.Such violations may be permanent or temporary.Besides blindness may provoke such eye diseases like diabetic retinopathy, macular degeneration, cataracts, glaucoma.Restoring the quality of visual function possible with the mandatory condition of timely quality treatment for the above diseases.Acquired color blindness can occur as a result of various injuries and injuries of the eyes (especially the retina)

blindness - Treatment

In the case of hereditary nature of color vision problems, treatment or correction of modern medicine has not yet developed, but some of the problems of acquired type of treatment yield, andin this case is very important root cause of the disease.For example, if the result of cataract have problems of color perception, after removing the color vision often returns to normal.People with milder forms of color blindness over time produce enduring habit of associating a color with any object.In some forms of color blindness, to correct color perception people prescribed the wearing of special glasses (can be adjusted only a few shades)

To ensure adequate color perception suggest you go test of colorblindness

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