Blindness - Symptoms, Causes and Diagnosis Test


1. Causes and types of color blindness

2. features of the disease in children

3. Diagnosing colorblindness

blindness - a disease of the organs of vision, in whichthe eye is unable to distinguish between the one or more primary colors.It is a hereditary disease associated with defective X chromosome.Sometimes a visual impairment like color blindness develops due to nerve or eye diseases.

blindness in women occurs in many times less than that of men.Women are the only carriers of the disease gene, and the probability of color blindness in children depends on the floor.Boy can get from the mother chromosome with a gene carrier.Colorblindness in women is not to be, and the possibility of violations of color her son is 50%.The probability of the birth of the girl with color blindness is very small: it is necessary that both parents have the defective X chromosome.

Causes and types of color blindness

cause of color blindness called disruption of color-sensitive receptors, whi

ch are located in the central area of ​​the retina eyes.These receptors are cone - specific nerve cells.Man has three kinds of cones.Each type comprises a specific color-pigment which is responsible for one primary color perception.One kind of pigment takes the red spectrum, the other - blue, the third type - green.People with normal color perception have cones in all three types of pigments.

Those who suffer from this defect of as color blindness, from birth, impaired development of one, two, sometimes three color-sensitive pigments.Most color-blind can not distinguish between one of the primary colors - blue, purple, green or red.But some people do not see some colors, the so-called steam blindness, or any color - color blindness.Vision with color blindness is arranged so that an invisible person perceives color like gray.

Depending on what type of pigment does not function properly distinguish different types of color blindness:

  • Protanopia - immunity red;
  • deuteranopia - Immunity Green;
  • acyanopsia - immunity of blue-purple color.

Less often found acyanopsia.

features of the disease in children

blindness in children, as well as in adults, manifested inability to perceive one or more primary colors.

If the family had already been cases of this disease, which means that the color blindness gene may be present in a woman.In such a family, you need to pay careful attention to the child's vision to how it can be used to diagnose a violation, if it exists.It is necessary to observe whether the baby correctly distinguish colors: play with it in appropriate games, ask to call the color pencils.At an early age it is quite difficult, because the child can still simply do not learn the names of colors.It is necessary to pay attention, do not confuse whether the baby blue pencils and green or green with a red pencil.

Diagnosing colorblindness in children is usually carried out in 5-6 years.By this age, the baby should be fully formed concept of colors.On examination, the doctor of the child administer the test for color blindness.

blindness is not considered a serious disease, so there is no special treatment from him.Such children are taught to associate a certain color to the subject.Task color-blind child's parents - to help your child adjust to our multi-colored world.

Diagnosing colorblindness

most often for the diagnosis of the impairment test is used for color blindness.To do this, the patient is given a set of pictures with hidden letters and numbers that are made in different colors.The man with the correct color perception, sometimes with difficulty, but gives about 90% of correct answers.A person with color blindness gives 5-25% of correct answers.There

verification of color using Rabkin polychromatic tables.This method utilizes twenty-seven tables of color, the background of filled circles are the same brightness.In them, a figure that the patient should be determined.Using this method you determine the type of color blindness in more detail.

addition to test for color blindness using a special device - anomaloscope.The principle of its operation is based on dosing and preparation of color mixtures.With anomaloscope diagnosed with different degrees of color perception disorders.

Treatment of congenital color blindness is not possible.But some of the acquired color vision problems caused by any disease, are treatable.In this case, therapy is to treat the underlying disease.


This article is available exclusively in the educational purposes and is not research material or professional medical advice.

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