RU2285440C2 - Device for inspecting field of view - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: device for inspecting field of view has demonstration screen with perforations and light point test-objects in form of light-emitting diodes which are shown to patient. Fixation light test-object is fastened to surface of screen along its central axis. Device has spheroid-shaped case with handle and multi-digit bus for connecting light-emitting diodes to control unit and power voltage source. Demonstration screen is mounted in cavity of case to make gap with it. Screen is made in form of hollow sphere. Peep window is made in case and demonstration screen to see light test-objects. Peep window is made in front of fixation light test-object. Case, demonstration screen and peep window have diameters of (2,25-2,4)L, (1,75-1,9)L and (0,85-1,1)L correspondingly, where L is horizontal size of human eye-socket.

EFFECT: widened borders of filed of view; provision of diagnostics at early stage of disease; improved quality of inspection.

Description

The invention relates to medicine, in particular to ophthalmology, and can be used for early diagnosis of primary glaucoma and other diseases that limit the field of view of the human eye.

In the last 10-15 years, the view on the leading role of the level of intraocular pressure in the symptom complex of glaucoma and the pathogenesis of the development of glaucomatous atrophy of the optic nerve has changed. The individual tolerance of the optic nerve determines the individual level of ophthalmotonus, in which trophic nerve structures of the eye are not disturbed. This makes it obvious that in order to identify the onset of the development of optical neuropathy and assess the dynamics of its course, in particular with glaucoma, early detection of the initial changes in peripheral vision is of great importance. These changes, as you know, are expressed in the narrowing of peripheral borders and the appearance of live fields of cattle in the paracentral parts of the field of vision, which is explained in both cases by a trophic disturbance in those parts of the retina that receive food from the smallest-sized retinal arterial vessels.

The earliest changes in the central parts of the retina are detected by various methods of computer static perimetry and campimetry, in which the determination of a decrease in the threshold of sensitivity of the retina indicates the beginning of the development of optical neuropathy. The apparatuses and methods for studying peripheral vision that exist today allow us to judge the function of the parts of the retina at 60 degrees from the fixation point (L.S. Urmacher, L.I. Aizenshtat “Ophthalmic devices”, M .: Medicine, 1988, Perimeters section, pp. 43-57). At the same time, the extreme periphery of the retina, which is most sensitive to increased intraocular pressure, remains outside the scope of the study, which reduces their diagnostic value. For early diagnosis of trophic disturbances in the periphery of the retina, especially its lateral parts, which is explained by the specifics of blood supply to this zone, equipment and methods are needed to illuminate, that is, to receive an answer to light irritation, the most sensitive photosensitive elements of the retina of the eye.

Some models of modern perimeters allow using the static (fixed position of light objects) or kinetic (moving in the field of view object) perimetry to determine peripheral boundaries within certain limits, depending on the anatomical natural formations of the facial skull. Therefore, the upper, inner and lower border is limited to approximately 60 degrees, and the outer has a maximum value of 90 degrees. However, it is the inner borders that begin to narrow at the development of optical neuropathy at the earliest, which is recorded as the appearance of the “nasal step”. This means that the pathognomonic for the glaucoma process will be the loss of lower- or upper-inner quadrants of the visual field. The diagnosis of these changes is delayed, since it is impossible to see a light object due to a mechanical obstruction in the form of a nose, eyebrow and zygomatic bone. Determining the stage of glaucoma by the degree of narrowing of the visual field often does not correspond to a more significant change in the optic nerve head. Often the stage of the disease is specified in the direction of the progression of the glaucoma process precisely by the state of the optic nerve, which is more consistent with the level of disturbance of trophic retina and its pathways.

Known devices for researching the field of view (copyright certificate No. 430841, A 61 B 3/02; 596219, A 61 B 3/02; 654245, A 61 B 3/02; 810209, A 61 B 3/02; 950305, A 61 B 3/02; 1205890, A 61 B 3/02; SU patent No. 1489572, A 61 B 3/02). The analysis shows that the known devices for the study and diagnosis of the visual field, differing in their constructive implementation, have a common significant drawback due to the physiological configuration of the face (the presence of the nose, eyebrow and zygomatic bone). These devices do not allow to study the real (full) boundaries of the field of view of the eye, but only its certain narrowed areas. As a rule, these are: upward - 55-60 °, downward - 65-70 °, inward - 55-60 °, outward - 90 °. Those. without research, the peripheral regions of the retina, especially its lateral sections, whose condition is decisive in the early diagnosis of retinal diseases, remain.

A known method for the early diagnosis of open-angle glaucoma (RF patent No. 2220644, A 61 B 3/024), which is implemented using the projection perimeter of domestic production PRP-50. Using the PRP-50 perimeter and a combination of rather complicated manipulations with the patient’s head partially solves the problem of increasing the patient’s field of view. By moving on the surface of the perimeter sphere the fixation point of the gaze and turning the head of the examined patient, some correction of the boundaries is achieved, narrowed by the influence of the prominent parts of the eye socket and nose.

Given the shape of the inner shell of the eye - the retina, which is a little more than a hemisphere, it would be correct to receive a visual field in the form of a circle. On the instruments available in practice, such as a portable arc perimeter (Ophthalmic Instruments, p. 45), the PNR-1 perimeter (ibid., Pp. 45-46), the projection perimeter PRP-60 (ibid., P. 46 -51), hemispherical projection perimeter produced by K. Zeiss Yen (pp. 51-52), etc., the field of view looks like an ellipse. The peripheral parts of the retina that are most vulnerable to the development of optical neuropathy, diagnosed by narrowing the boundaries of the visual field, are first detected only when they narrow by more than 45-50 degrees in one or more of the three (upper, inner and lower) quadrants of the visual field.

In addition, the study of peripheral vision on the indicated equipment is stationary methods requiring a special room, large-sized, expensive equipment, not suitable for examining bedridden patients and conducting dynamic monitoring in ophthalmological rooms of regional polyclinics, and even more so at home.

Improvement of diagnostic equipment for the study of peripheral vision has been carried out in recent years in the direction of developing a portable device that would simultaneously increase the diagnostic value of the perimetry method.

A device for determining the boundaries of the field of view (copyright certificate No. 950305, A 61 B 3/02), which contains a hemispherical screen and a meridional grid for registration. The hemispherical screen is made transparent and mounted on the head, and the meridional grid is applied to the surface of the screen. Registration of the visual fields is performed on a diagram printed on a transparent screen hanging in front of the patient’s face, along which the presented object moves. This design does not solve the problem of separation of the eyes and the expansion of the fields of view narrowed by the protruding parts of the orbit and the nose.

A device for studying the field of view is also known (copyright certificate No. 1680056, A 61 V 3/024), which contains a hemispherical screen with LEDs located on its inner surface, a program unit for turning on the LEDs, a response recording unit, and a control panel.

This device is characterized by increased accuracy of the study by increasing the accuracy of the number of test objects presented per unit of field of view. Moreover, the device allows to increase the accuracy of exposure of the studied eye to a predetermined position. The advantage of the device is the fixing of a hemispherical screen on the flange with the possibility of rotation in the range 0-90 °.

The device for the study of the field of view described in the copyright certificate No. 1680056, by its technical essence and structural implementation is the closest technical solution to the patented invention, which leads to the choice of this device as a prototype. At the same time, the analysis shows that this device is also characterized by significant design and diagnostic flaws that reduce the effectiveness of its use in wide ophthalmic practice.

In particular, the device does not allow to study the extreme peripheral boundaries of the field of view, which is fundamentally important, for example, for the early diagnosis of glaucoma. The limited diagnostic capabilities of this device for studying the visual field are due to a largely ineffective constructive design of the hemispherical screen, the geometric shape of which differs significantly from the geometric shape of the retina of the eye, which does not allow to study and receive a response to light irritation of the most peripheral photosensitive elements of the retina the patient.

The disadvantages of the device for studying the field of view according to copyright certificate No. 1680056 include the rather large overall dimensions of the rotary hemispherical screen with light test objects, which significantly limits the area of its effective use. In particular, the device cannot be used to check the field of view of bedridden patients and in the field, as well as for self-monitoring at home for patients with glaucoma.

The present invention solves the problem of expanding the studied boundaries of the field of view of the patient’s eye, providing the possibility of early diagnosis of glaucoma, as well as improving the information content and quality of diagnosis of diseases of the retina.

The solution to this problem is achieved as follows. In a device for examining a visual field containing a demonstration screen with perforations and light point test objects in the form of LEDs for presentation to a patient, on the surface of which a fixation light test object is fixed along its central axis, according to the present invention to eliminate the limiting effect of the physiological configuration of the patient's face on the final results of the study of the visual field and to ensure the possibility of studying the periphery of the retina, the following constructive sheniya.

According to the invention, the device is equipped with a sphere-shaped body with a handle, in the cavity of which a display screen made in the form of a hollow sphere is mounted with a gap. The device is also equipped with a multi-bit bus for connecting LEDs to the LED control unit and the power supply source. Opposite the fixation vent test object, a viewing window for observing light test objects is made in the housing and the demonstration screen.

Moreover, the invention provides that the housing of the device, the spherical display screen and the viewing window are respectively made with a diameter of 2.25-2.4 L; 1.75-1.9 L and 0.85-1.1 L, where L is the horizontal size of the human eye socket.

According to the invention, for conducting static perimetry, a key is placed on the handle of the case for the patient's response “Test object is visible” and for connecting to the recording unit of measurement results. The perforations of the demonstration screen are made in the form of holes in which the ordering of 8-16 meridians, evenly spaced across the entire surface of the demonstration screen, is placed from 72 to 144 light test objects. On each even meridian, light test objects are located at 10 °, starting at 10 °, and on each odd meridian, light test objects are located at 10 °, starting at 5 ° (Fig. Z-A).

According to the present invention, for conducting the kinetic perimetry, the perforations of the spherical demonstration screen are made in the form of meridionally directed arcuate slots, in each of which a light test is installed on the object with the ability to move it along the entire length of the arcuate slit.

It is envisaged that in the housing there are made meridionally directed arcuate slots identical in number, shape and size, located above the arcuate slots of the demonstration screen. At the same time, a degree scale is plotted along the entire length of each arcuate slit of the body to record the results of measurements of the patient's field of view.

The invention provides that for checking the visual fields of color as light point test objects, color LEDs (red or green) are placed in the perforations of the demonstration screen.

If necessary, a latch with a corrective eyeglass lens can be installed on the viewing window for observing test objects, and the surface of the spherical demonstration screen contains an antiglare coating.

Effective constructive solutions implemented in a patented device for studying a field of view allow to obtain a technical result, which consists in the following:

- the device allows you to explore the peripheral, the most extreme in their location areas of the retina and identify the early stages of retinal diseases, such as glaucoma (figb);

- the device allows you to expand the boundaries of the studied field of view and to provide the study of the retina from all sides at 90 ° (Fig.3B);

- the device has a wide range of effective applications; can be used to diagnose the pathology of the visual analyzer, some neurological diseases, such as multiple sclerosis; allows both static perimetry to measure the actual photosensitivity of the retina and the threshold of its sensitivity, and kinetic perimetry to detect a clear narrowing of the visual fields and its loss (by cattle);

- due to the minimum overall dimensions (figa, B), the simplicity of the method of studying the field of view, this device will find application in conducting professional examinations (screening studies), to check the field of view in bedridden patients and in the field, as well as for self-monitoring at home for patients with glaucoma;

- A significant advantage of the patented device is its portability, ease of use and economical price, which makes it affordable for almost all medical institutions.

The invention is illustrated by a description of possible embodiments of a device for the study of the field of view and the drawings, which show:

figure 1 is a variant of the device for conducting static perimetry;

figure 2 is a variant of the device for conducting kinetic perimetry (A is a view of the device from the outside; B is a sectional view of the device body);

figa - arrangement of test objects on the surface of the demonstration screen with static perimetry; B - scheme of the study of photosensitivity of the retina in the maximum volume;

figa, B - arrangement of the device relative to the face of the patient;

5 is an example of a block diagram of the connection of a patented device to external control units and recording results.

Patented device for the study of the field of view due to its optimal structural dimensions and physiologically optimal shape of the case and the demonstration screen with light point test objects allows you to use it for both static perimetry and kinetic perimetry.

For conducting static perimetry, the device comprises (Fig. 1) a spherical-shaped body 1 with a handle 2, on which there is a key 3 for the patient's response "The test object is visible." In the central part of the housing 1, a viewing window 4 is made for the patient to observe light point test objects. The dimensions of the viewing window 4 are determined based on the natural physiological dimensions of the human eye socket and taking into account the geometric shape and dimensions of the spherical display screen. It is known that the horizontal size of the human eye socket for adults is on average about 40 mm, and the vertical size is 35 mm (V.N. Ponomarenko; S.I. Basinsky “Clinical anatomy of the organ of vision”, Ministry of Health of the Russian Federation, Blagoveshchensk State Medical Institute; Blagoveshchensk , 1989, p. 7). Based on this, the size of the viewing window 4 is set to a diameter of 0.85-1.1 of the horizontal size of the human eye socket, i.e. about 3.4-3.5 cm - 4.4-4.5 cm.

The housing 1 can be made, for example, of plastic. Experimental testing of the device revealed certain advantages of the spherical shape of the body 1, which correlates as much as possible with the natural physiological configuration and size of the person’s face and allows you to best place the patented device relative to the patient’s face (figa, B).

In the cavity of the housing 1, a demonstration screen 5 is mounted with a gap for presenting light point test objects to the patient, which is made in the form of a hollow sphere.

The diameter of the demonstration screen is selected based on the physiological configuration of the person’s face, the conditions for placing a certain number of test objects on its surface (from 72 to 144 LEDs), and also taking into account the natural size of the human eye socket (“Clinical Anatomy of the Organ of Vision”, page 7) . Studies have shown that the optimal diameter of the spherical display screen 5 is 1.75-2.0 of the horizontal size of the human eye socket, i.e. from 7 to 8 cm, while the diameter of the housing 1 is set respectively 2.25-2.4 horizontal size of the human eye socket, i.e. 9-9.5-9.6 cm.

The demonstration screen 5 can be made, for example, of matte plastic. The thickness of the demonstration screen 5 can be different, for example, it can be from 0.15 to 0.25 mm, which ensures the necessary brightness of the light test objects.

Perforations in the form of holes 6 (with a diameter of 0.5 to 1.0 mm) were made over the entire spherical surface of the demonstration screen 5, and a light point test object was installed behind each hole, using 7 LEDs.

In total, 72 to 144 LEDs are installed on the spherical surface of the screen 5 (depending on the design variant of implementation). In this case, the perforations (holes 6) and LEDs 7 (test objects) are arranged in a certain ordered manner. Perforations made on the spherical surface of the demonstration screen 5 form 8-16 meridians. On each even meridian (for example, for a demo screen with 16 meridians these are: 2, 4, 6, 8, 10, 12, 14, and 16) the point test objects are located at 10 °, starting at 10 °, i.e. as follows: 10 ° -20 ° -30 ° -40 ° -50 ° -60 ° -70 ° -80 ° -90 ° (FIG. 3A).

On each odd meridian (1, 3, 5, 7, 9, 11, 13, 15), light point test objects are located at 10 °, starting at 5 °, i.e. in the following order: 5 ° -15 ° -25 ° -35 ° -45 ° -55 ° -65 ° -75 ° -85 ° (FIG. 3A). Thus, 9 perforations (holes) were made on each meridian and 9 point light test objects 7 were installed respectively. This arrangement of point test objects throughout the entire field of the demonstration screen allows us to determine the photosensitivity of the retina uniformly in all quadrants and in a maximum volume of up to 90 ° from all sides (figb).

To prevent glare of the screen 5 and to ensure concentration of the patient’s attention, the surface of the demonstration screen 5 has an antiglare coating, for example matte. The LEDs 7 are connected (not shown) with a multi-bit bus 8, which serves to connect the device to external control units, recording the results of measuring the field of view.

A variety of control units and recording measurement results can be used to conduct field of vision studies. For example, similar blocks of the commercially available domestic automatic perimeter “Pericom”. At the same time, the device can be used both in a computer version with a printer (model “Perikom-01), and with an autonomous control unit and printer (model“ Perikom-02). The developed device can also be used, for example, in a hardware configuration, which is implemented in ed. St. No. 1528434.

A significant advantage of the patented device is the ease of its management and the possibility of its operation, for example, in the Windows software environment, which is familiar to many users of a home personal computer.

To diagnose the pathology of the visual analyzer and some neurological diseases (for example, multiple sclerosis), the use of colored dot test objects of LEDs 7 in red or green is provided.

On the spherical surface of the demonstration screen 5, a fixation light test object LED 9 is located along its central axis, opposite which (along the central axis of the screen 5), in the spherical surface of the screen 5, a viewing window 4 is made (similar to case 1) for observing the light test of objects 7 and 9 .

To conduct field of view studies with patients in cases of sharply reduced visual acuity against the background of a pronounced anomaly of refraction, the device contains (not shown) an appropriate fixative for holding a corrective spectacle lens in front of the patient's eye. The latch can be made, for example, in the form of a bracket, clamping screws, etc. The latch is fixed in the area of the viewing window 4 on the housing 1. With a certain structural implementation, the corrective lens can be placed in a special slot in the housing 1 behind the viewing window 4 (not shown).

To conduct kinetic perimetry, the patented device contains (figa) a spherical body 1 with a handle 2. In the central part of the body (along its central axis) 1 there is a viewing window 3 for the patient to observe light point test objects.

The device body 1 contains 8 meridionally directed arcuate slots 4. A degree scale (in 10 ° increments) is plotted along the entire length of each slit 4 to record the results of measurements of the patient’s field of view.

In the cavity of the sphere-shaped body 1 with a gap, there is installed (FIG. 2B) a demonstration screen 5 in the form of a hollow sphere, which contains (like the case 1) 8 meridionally directed arcuate slots 6, identical in shape and size to the slots 4 of the body. The arcuate slots 4 of the housing 1 and the arcuate slots 6 of the demonstration screen 5 correspond (coaxial) to each other.

In each slit 6, a light point test object LED 7 is installed with the ability to move along the entire length. The elongated upper part 8 of the LED 7 is located in the slit 4 of the housing 1, which makes it possible to move the LED 7 along the entire length of the slit during kinetic perimetry.

The demonstration screen 5 has (like the case 1) a viewing window 3 for observing light test objects. A fixation light test object LED 9 is installed on the surface along the central axis of the demonstration spherical screen 5. LEDs 7 and 9 are connected (not shown) to a multi-bit bus 10, which serves to connect to an external power supply, which can be used as a stationary or an autonomous voltage source.

The study of the field of view of the patient’s eyes using the patented device is as follows.

Static perimetry

To conduct static perimetry, the patented device is connected, for example (as shown in ed. Certificate No. 1528434), to the control unit 11 (Fig. 5), which is connected to the remote control 12 and the registration unit 13. The patient uses the handle 2 to set the device through the viewing window 4 tight to the examined eye (Fig. 4 A, B). The geometric shape and dimensions of the body 1 of the device and the spherical demonstration screen 5 located in it, which fully take into account the natural features of the physiological configuration of the person’s face, allows you to directly apply the developed device to the patient’s eye and, in optimal conditions, conduct field of view studies. In this case, the pair eye is closed with a light bandage.

The patient’s gaze is fixed on a fixation light test object 9, which is located in the center of the spherical surface of the screen 5 opposite the viewing window 4 and alternately present point test objects (stimuli) in the form of luminous dots (LEDs 7) located on the spherical surface of the demonstration screen 5, their perception is recorded and the state of the patient’s visual system is determined from it.

In the process of studying the field of view, the doctor, by pressing the corresponding button of the block 12, starts the LED control unit 11 and performs alternate illumination of the LEDs 7 on the demonstration screen 5 with certain time intervals and brightnesses. It is known that the accuracy of perimetric studies significantly depends on the fixation of the gaze. Two main factors influence the nature of fixation: the duration of the stimulus and the randomness of the place of its presentation (A.M. Shamshinova; V.V. Volkov “Functional research methods in ophthalmology”, M .: Medicine, 1999, pp. 92-100 ) To ensure high accuracy of research and obtain objective measurement results in a patented device, the duration of the presentation of the stimulus (light test object) is provided: 0.1 s; 0.2-0.5 s with an interval of 2-3 s.

When the patient presses the key 3 of the answer “Test object is visible”, the coordinates of this LED are recorded in block 13 of the registration of the results of the study. After the glow of all the LEDs 7, the registration information block 13 is displayed on the display panel (not shown) or on a printing device (printer - not shown).

The doctor analyzes the results of the study and gives an appropriate diagnostic conclusion about the condition of the patient’s visual system.

Kinetic Perimetry

A patented device for the study of the field of view (figure 2) is connected to a power source (not shown). The patient uses the handle 2 to install the device viewing window 3 tightly to the eye (figa, B). The twin eye is covered with a light bandage.

The patient’s gaze is fixed on the fixation light test object 9, which is located in the center of the spherical surface of the demonstration screen 5 opposite the viewing window 3, and alternately randomly move the light test object 8 along the arcuate slit 4 in the direction from the periphery to the center until when the patient sees the light emanating from test object 8 and says “I see the light” or “is”. On the degree scale applied on the device’s body 1 along each arcuate slit 4, the boundaries of the visual fields are marked, and the corresponding data are entered by the doctor on a blank chart, the subsequent analysis of which allows the doctor to accurately assess the state of the patient’s visual system.

The applicant conducted studies of the potential capabilities of the developed device in ophthalmic practice, which confirmed the high efficiency of the present field of study device. Experimental testing of this device instrumentally indicates that its use allows you to really expand the boundaries of the studied areas of the retina, to increase the information content and quality of diagnosis, to provide greater reliability and objectivity in assessing the state of the patient’s visual system. At the same time, experts note the undoubted operational advantages of the patented perimeter: portability, comfort and ease of use in ophthalmic practice.

Example 1. Patient R., 45 years old, was examined by an ophthalmologist on the hemispherical perimeter “Karl Zeiss Jena” and on the basis of the revealed pathology (intraocular pressure 28-29 mm, absence of pigment rim of the iris, hyperpigmentation of the anterior chamber angle, reduced coefficient of ease of outflow of intraocular fluid , normal boundaries of the visual fields) was diagnosed with an open-angle initial with moderately elevated IOP glaucoma.

When examining the visual fields on a patented device (which allows us to estimate the sensitivity of the retina in all quadrants to the very extreme periphery of the retina, i.e., 90 ° from all sides), a significant narrowing of 30-35 ° in the upper and lower inner quadrants was revealed, which, with traditional perimetry, fit into the concept of the average normal boundaries of the visual fields from the nasal side.

The revealed pathology of the retina correlated with a change in the optic nerve disc (optic disc) in this patient. The ratio of the diameter of the excavation to the optic nerve disc corresponded to 0.5-0.6 with a displacement of the vascular bundle in the nasal direction.

The initially underestimated stage of the patient’s glaucoma process could lead to erroneous treatment tactics.

Example 2. Patient A., aged 50, was examined with suspected glaucoma. There are individual features of the face: deep-set eyeballs in the orbit, protruding superciliary arches, high back of the nose.

The study of peripheral vision on traditional hemispherical perimeters showed a significant narrowing of the field of view above, outside and below by 20 °, inside by 30 ° from the accepted average boundaries (from above-inside-from below 55-60 °, outside 85-90 °), which corresponded to the developed glaucoma stages. However, from the intraocular pressure and the optic nerve disc, no abnormalities were noted.

The patient was examined using a patented device. A check of the peripheral boundaries of the visual fields showed that in all quadrants the boundaries of the visual field reach 80-85 °, which corresponds to the norm. The diagnosis of glaucoma has not been confirmed.

Claims (6)

1. A device for studying the field of view, containing a demonstration screen with perforations and light point test objects in the form of LEDs for presentation to a patient, on the surface of which a fixation light test object is fixed along its central axis, characterized in that it is provided with a sphere-shaped body with a handle, in the cavity of which a demonstration screen made in the form of a hollow sphere is mounted with a gap, and a multi-bit bus for connecting the LEDs to the LED control unit and the power supply voltage, and in the case and the demonstration screen opposite the fixation light test object, a viewing window for observing light test objects is made, while the case, the demonstration screen and the viewing window are respectively made with a diameter of (2.25-2.4) L, (1 , 75-1.9) L and (0.85-1.1) L, where L is the horizontal size of the human eye socket. 2. The device according to claim 1, characterized in that, for conducting static perimetry, a key is placed on the handle of the case for the patient’s response “the test object is visible” and for connecting to the recording unit of measurement results, and the perforations of the demonstration screen are made in the form of holes in which orderly in the form of 8-16 meridians, evenly spaced across the entire surface of the demonstration screen, from 72 to 144 light test objects are placed, while on each even meridian light test objects are located at 10 °, starting at 10 °, and on azhdom odd meridian illuminated test sites are located at 10 °, from 5 °. 3. The device according to claim 1, characterized in that for conducting the kinetic perimetry, the perforations of the demonstration screen are made in the form of meridionally directed arcuate slots, each of which has a light test object with the ability to move it along the entire length of the arcuate slit, and in the case identical in number, shape and size, meridionally directed arcuate slots located above the arcuate slots of the demonstration screen, while along the entire length of each arcuate slit of the housing and a degree scale for recording the results of measurements of the field of view of the patient. 4. The device according to claim 1, characterized in that as the light test objects in the perforations of the demonstration screen, colored LEDs are placed. 5. The device according to claim 1, characterized in that a latch with a corrective spectacle lens is mounted on the viewing window of the housing. 6. The device according to claim 1, characterized in that the surface of the demonstration screen has an anti-glare coating.

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