Computer perimetry of the eye

Before determining the presence of eye disease and the degree of its development, a doctor ophthalmologist conducts eye diagnostics on the most modern equipment. One of the diagnostic methods is the computer perimeter of the eye.

Method definition

Computer perimetry - this is one of the most modern methods, allowing you to identify many of the eye diseases. It allows you to detect serious pathologies, which include:

• Glaucoma;
• The initial stages of retinal detachment;
• Inflammation of the optic nerve;
• Tumors of the eyeball;
• Dystrophic pathology of the retina.

Computer perimetry assesses the state of the fields of vision. The field of view is quite a relative value.When a person focuses his eye at a certain point, he will still see the surrounding objects.The picture will be fuzzy and vague, but it is still perceived by the brain. And fixed both static and dynamic objects. Correct color perception.

The computer perimetry of the eye is completely painless and does not give any complications.

Since no computer medicine is used for computer perimetry of the eye, and completely there is no any surgical intervention, there are few contraindications for this procedure.Computer perimetry is not assigned:

• Persons in a state of alcoholic or narcotic intoxication;
• Patients with mental disabilities;
• Persons of a degenerative type.

Definition of peripheral vision

Application area

The computer perimetry, first of all, is designed to detect eye diseases, but since the signals for The optic nerve is transmitted directly to the brain, this method allows you to diagnose some other pathology:

• Brain disorders related to stroke;
• Craniocerebral injury;
• Neoplasms in the brain.

If the patient feigns problems with vision and claims that he sees poorly, for example, in order to avoid conscription, the computer perimetry will immediately prove the failure of such a statement.Some patients tend to exaggerate their symptoms, but it's almost impossible to deceive computer diagnostics.

Tables that determine visual acuity

In addition to modern diagnostic procedures in the armament of ophthalmologists are located and successfully used tables that determine visual acuity. There are several types of tables named after their creators.Most often, ophthalmologists use a table developed by Dr. Sivtsev.It represents the signs of the Russian alphabet, located in 12 lines and decreasing from the top row to the bottom. The letters of 10 lines, correctly read from a distance of 5 meters, mean that the person has excellent vision. This is denoted as,.

Together this table uses the Golovin table. It consists of 12 lines, but instead of letters the lines are formed by rings with cuts located on different sides.A person with good vision should correctly determine the angle of the cut from the top line to the line at number 10 from a distance of 5 meters.If the patient distinguishes the cut zone only at the topmost line, then his vision is estimated as,. If the first and second rows are different, the vision will be,. And so consistently from top to bottom.

To test visual acuity in children who do not know the letters, Orlova's table is used.The table depicts drawings of animals, birds, trees and other objects familiar to the child. These icons decrease from top to bottom.

If the child has normal vision, he will clearly see and determine the patterns on line 10 from the top at a distance of 5 meters. If the child does not see the picture even in the highest line from a distance of 5 meters, it is brought closer to the meter, and so on until the child calls visible images.

Computer Perimetry

For the diagnosis is used a device that looks like a hemisphere. Inside there is a chin rest and an abutment for the forehead of the patient.The patient sits comfortably on a chair in front of the device and leans his chin on the support.Computer perimetry is performed separately for each eye, so one eye, for the time of the procedure is closed by a bandage.In the process of research, the patient looks into the center of the darkened chamber, where a luminous dot-marker is projected.

Device for computer perimetry

Next, the computer, in any order, displays on the inner surface of the sphere luminous points. The patient has a button in his hands, by pressing which he marks the appearance of the light.The program changes the speed of appearance of points, their size and brightness. Points appear in random order and from different sides.After the test is completed, the procedure is repeated for the other eye.

In order for the diagnostic test to proceed correctly, the patient should not shift his eyes from the marker point.

Receiving and evaluating results

In ophthalmologists, a conditional net of meridians is applied to the eyeball, they connect the anterior and posterior central points of the eye. The computer program, after the patient pressed the button, fixes the coordinates of the point. It happens that the subject just did not have time to press the button, although he saw the appearance of the light.To eliminate some errors, the secondary control program is activated. The whole procedure takes no more than 20-30 minutes. Then the computer processes the received data and prints the result.After that, the ophthalmologist receives a map that indicates the boundaries of the visual fields in degrees.

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The field of view is not a continuous zone.Even in a healthy person in the field of vision, some areas fall out where the points are not fixed.Such areas are surrounded by a normal field of view.

In particular, every person has a blind spot. This is the zone of the optic nerve, where there are no receptors. The cardiovascular system of the retina is also displayed on the map. By narrowing the fields of vision and a number of other factors, it is not difficult for a specialist to put a correct diagnosis and prescribe a treatment.

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conclusions

Computer perimetry of the eye is a good opportunity to identify the majority of eye pathologies at an early stage and take appropriate measures. The cost of the procedure is small, so it is available to all segments of the population. Each person, especially over 40, should visit the ophthalmologist at least once a year to prevent the occurrence of a possible eye disease.

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