RU9706U1 - DEVICE FOR STUDYING THE VISUAL SYSTEM OF CHILDREN BY THE CESM METHOD - Google Patents

Abstract

A device for studying the critical flicker fusion frequency, comprising a quartz reference frequency generator, an adjustable variable frequency generator, the outputs of which are connected to the inputs of the beat-frequency mixer-mixer, and the mixer output - to the input of the beat frequency divider, the first output of which is connected to one input of the AND inhibit circuit , the second output of which is connected to the input of the pulse former of ČSN, the output of the quartz oscillator of the reference frequency is connected to the former of the duration of the measuring interval, you One of which is connected to the other input of the AND inhibit circuit, there are two emitters at the output of the device, and one emitter is lit continuously, and the light sources are made in the form of headlights of a toy car, characterized in that, for the purpose of studying stick vision, three-color emitters are inserted into the device, a switch the color of the blue output stimulus is equipped with a radiation brightness switch, the flickering emitter is connected to the output of the pulse generator, and the other non-flickering blue emitter is through the brightness switch and radiation is connected to a DC power source.

Description

DEVICE FOR STUDYING THE VISUAL SYSTEM OF CHILDREN 11STODES KCHSM

The utility model relates to medical equipment, namely, devices for conducting ophthalmic examinations in children by the method of CSFM.

A device for determining the critical fusion frequency of light flickers, which contains a power source, a voltage stabilizer, an overload protection unit, a pulse generator, a first frequency divider by 10, a second frequency divider with a variable division ratio, a third frequency divider by 1000, a power conditioner pulses, source, light and unit for discrete frequency setting (1).

The disadvantage of this device is the difficulty of determining CFSM in young children.

There is also known a device for studying the critical frequency of flicker fusion in children, which contains: a reference frequency generator, adjustable-generator: variable frequency, a mixer and pulse shaper ChSM, a color light stimulator, a shaper of the duration of the measuring interval, the inhibit circuit And, pulse counter, digital ChSM flicker-fusion frequency indicator, two-color emitters in the form of headlights of a car © - toys 2.

A 61 at 5/16

To explore the child’s wand vision.

The purpose of the invention is to increase the accuracy and reliability of the results of the study of the child’s and kolobochnogo apparatus.

The device contains: a quartz reference frequency generator 1, an adjustable variable frequency generator -2, a mixer and a beat frequency generator, a beat frequency divider - 4, a pulse former than - 5; color stimulus color switch - b, shaper of the measurement interval duration - 7, prohibition circuit I - 8, pulse counter - 9, digital indicator of the flicker fusion frequency ChSh-10, three-color emitters 11-12 (car toy headlights), moreover, one of the headlights steady on, and blue stimuli are connected via a brightness switch.

The device operates as follows: from a quartz oscillator 1 and an adjustable oscillator 2, the signal is supplied, respectively, to the first and second inputs of the beat-frequency mixer-shaper - 3, from the output of which pulses are fed to the frequency divider - 4, from the first output of the divider 4 pulses are received one of the inputs of the inhibit circuit 8, the second input of this circuit receives a pulse of resolution of the count, from the output of the shaper of the duration of the measuring interval 7, the input of this shaper receives the signal from the crystal oscillator 1, from the second the output of the divider 4, the pulses are fed to the pulse shaper of the FSM (flicker fusion frequency) where their constant duration and amplitude are set, then the signal goes to the color switch of the output pulse 2 of module 6, which is connected with its outputs to a three-color emitter 12, and, to the blue LED crystals emitters 12 and 11 pulses are fed through a brightness switch 13, but the emitter 11 is lit continuously. The child is guided by him during the study of CFSM. The drawing 1 shows a block diagram of a device.

The determination of the critical flicker fusion frequency (CFSM) is as follows: first, the cone system of color detectors (red, green, and blue) is checked, then after 5-10 minutes of dark adaptation, the wand system (twilight vision), and the brightness of the blue crystal is reduced by switch 13. Sources of information :

1.V.V. Rybin, A.A. Antonenko and A.B.Baberdin, A.S. N 1609469, CL.A 61 V 5/16,

A device for determining the critical fusion frequency of light flickers. Byul. N 44, 1990.

2.K.V. Golubtsov, G.V. Kazarin, E.V. Rogatina.

A device for determining the critical frequency of flicker fusion in children. Application for utility model N 96124410/20 (031163) Positive decision of March 26, 1997

3.E.V. Rogatina, K.V. Golubtsov, The critical frequency of flicker fusion in the differential diagnosis of pathology of the visual analyzer in children. Bulletin of Ophthalmology. Volume 113, N 6, 1997, pp. 20-21. Moscow, Medicine.

Compiled by K.V. Golubtsov.

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Claims (1)

A device for studying the critical flicker fusion frequency, comprising a quartz reference frequency generator, an adjustable variable frequency generator, the outputs of which are connected to the inputs of the beat-frequency mixer-mixer, and the mixer output - to the input of the beat frequency divider, the first output of which is connected to one input of the AND inhibit circuit , the second output of which is connected to the input of the pulse former of ČSN, the output of the quartz oscillator of the reference frequency is connected to the former of the duration of the measuring interval, you One of which is connected to the other input of the AND inhibit circuit, there are two emitters at the output of the device, and one emitter is constantly on, and the light sources are made in the form of headlights of a toy car, characterized in that, for the purpose of studying the wand vision, three-color emitters are inserted into the device, a switch the color of the blue output stimulus is equipped with a radiation brightness switch, the flickering emitter is connected to the output of the pulse generator, and the other non-flickering blue emitter is through the brightness switch and radiation is connected to a DC power source.