The organs of vision are of great importance for the perception of the surrounding world. Thanks to the eyes, people and animals receive 90% of the information. Therefore, problems with the organ of vision are always a reason to seek help from a specialist. Only by conducting the necessary examinations can one understand why a violation has occurred. The diagnosis of eye pathologies includes the measurement of visual acuity, ophthalmoscopy, examination of retinal vessels, as well as computer perimetry. Each of these studies is important for the detection of diseases. Thanks to this method, you can find out exactly which area has fallen out of activity.
Description of computer perimetry
Computer perimetry is a research method that can detect changes in the visual field. Normally, a person sees not only what is directlyin front of him, but also part of the surrounding objects located on the sides. This function is carried out thanks to peripheral vision, for which the brain is responsible. With various ophthalmic and neurological pathologies, visual field loss occurs. Such disorders include hemianopia. Loss of one or more fields of vision and its replacement with a white veil is called scotoma. Computer perimetry of the eye allows you to estimate the number and size of defects. Also, thanks to it, it is possible to diagnose those visual impairments that are at an early stage and have not yet manifested clinically. Previously, there were other devices for detecting livestock. However, computer perimetry differs from them in a higher accuracy of calculating the boundaries of the field of view and existing defects. This diagnostic method is a safe and non-invasive procedure.
What is a visual field test done for?
Narrowing or complete disappearance of the field of vision is a serious violation. The same applies to the loss of its plots - by cattle. In some cases, the pathology is not considered ophthalmic, but refers to diseases of the brain. Therefore, the following indications for computerized perimetry can be distinguished:
- Retinal dystrophy.
- Loss of the organ of vision with acids or alkalis, thermal burns.
- Retinal hemorrhage.
- Tumor lesions of the organ of vision.
- Increased intraocular pressure - glaucoma.
- Retinal detachment.
- Inflammation or damage to the optic nerve.
- Brain injury.
- Hemorrhagic and ischemic stroke.
- Retinopathy due to arterial hypertension and diabetes.
All these conditions are quite dangerous, as in advanced cases they can lead to complete blindness.
Computer perimetry technique
To explore the field of view, it is necessary to fix the gaze on a certain object. Everything that a person "captures" with the eye outside of this image is carried out with the help of peripheral vision. It is worth remembering that the study of vision is contraindicated in some situations. Among them:
- A state of alcohol or drug intoxication.
- Emotional lability.
- Mental retardation.
In all the listed states, the patient is not able to clearly concentrate his gaze and follow the instructions of the ophthalmologist. Computer perimetry is based on the study of the capabilities of the organ of vision in setting a number of tasks. The patient is seated behind a special device with an optical system. Each eye is checked separately, while the second is covered with a flap. First of all, the patient fixes his gaze on one object. In this way, the width of the visual fields is estimated. After that, other objects appear around the main image - objects of different light and brightness. In this case, the gaze should also be fixed. Further, images on the periphery move in space. Thanks to this method, it is possible to assess not only the size of the visual fields, but also the susceptibility to colors, light, and movement.
Varieties of computer eye perimetry
Depending on what kind of "picture" is depicted on the periphery, there are several types of research. In most cases, they are all applied in turn. This helps to identify more abnormalities and get an idea of visual function. Types of computer perimetry:
- Static. The patient fixes his gaze on a white dot located in the center of the device, and the visual fields at this moment are projected on a rounded surface. The lighting is constantly changing to capture the readings accurately.
- Kinetic. The patient needs to follow an object that is in motion. As the object approaches and moves away from the eyes, the device captures the necessary indicators.
- Campimetry. The subject must observe the moving white dot inside the dark square. The device evaluates the boundaries at which the object disappears and reappears.
- Amsler test. The patient is asked to focus on the middle of the drawing (grid). If the examined person sees straight lines, then there is no problem with the retina.
Computer perimetry: decoding of this method
After the examination, the results are recorded on a card used by ophthalmologists. Normally, the lower and inner limits should be equal to 60, the upper - 50, andouter - 90 degrees. The presence of physiological cattle is not considered a pathology, since they arise due to a blind spot located on the retina. If the loss of fields is large or multiple, this is due to diseases of the organ of vision or the brain. Hemianopsia indicates a pathology of the optic nerve. By the number and nature of livestock, one can judge diseases such as migraine and glaucoma.
Which ophthalmological clinics in St. Petersburg carry out the study?
In any large regional center, you can be examined for the presence of vision pathology. The northern capital is no exception. Where can I undergo computer perimetry in St. Petersburg? The following ophthalmological clinics (in St. Petersburg) are known to have a device for this study:
- Oncoscreening Center.
- He alth world.
- Medem Clinic.
- Alpha Medica.
- "Family doctor".
- Research Institute of Experimental Medicine.
The cost of computer perimetry is from 400 to 1200 rubles.
