RU93247U1 - DEVICE FOR DETERMINING OPTICAL VISION CORRECTION PARAMETERS AND EXPRESS SELECTION OF COMPLEX GLASSES - Google Patents

Abstract

 1. A device for determining the parameters of optical vision correction and rapid selection of complex glasses, containing an ophthalmological table and a case with a facial unit, an optical eyepiece located in the upper part of the case, and installation elements in the lower part of the case, as well as a minicomputer and a display the operator and the output connector, characterized in that the controls are located in the lower part of the housing and contain a spherical segment of the surface of the ball protruding from the housing with a friction notch in one direction for impact on it by the patient, automatically installed in the specified meridional directions, as well as the "Enter", "Close", "Distance" and "Cancel" buttons. ! 2. The device according to claim 1, characterized in that the installation contains an additional element that is spring loaded and equipped with force sensors inserted into the device, located at the junction of the main element of the installation with its additional element and connected to the minicomputer. ! 3. The device according to claim 1, characterized in that the housing of the device is placed on racks (bars) rigidly fixed to the ophthalmic table with the possibility of adjusting the position of the housing in height. ! 4. The device according to claim 1, characterized in that for the transfer of the optical system from the position of focusing the eyes to a distance in the state of focusing the eyes for close to the system introduces an additional lens.

Description

The utility model relates to technical equipment for ophthalmology and allows you to quickly and accurately determine the astigmatic imperfections of the eyes both far and near, to perform rapid selection of complex glasses and eyeglass lenses, as well as perform screening monitoring of the state of vision during professional examinations.

The most modern productive devices of a similar purpose are autorefractometers [1, 2]. For example, the Topcon RM-8800 device [3] contains an ophthalmological table and a case with a facial unit. An adjustable optical eyepiece is located in the upper part of the facial system, and the instrument controls are in the lower part. The prototype includes an optical part connected to the eyepiece with sensors connected to the minicomputer. From the optical part, a test mark is projected in the infrared range through the eyepiece to the bottom of the patient’s eyeball. Its image falls on the photosensors of the optical part through a narrow slit oriented at each moment of time in one of the meridians of the eye under study. Before starting the measurements, the doctor adjusts the optical part of the device according to the parameters of the patient’s eye, moving light points on the image of the patient’s eye displayed on the screen in certain areas of the eye. After that, the optical part is automatically adjusted to the position of the greatest contrast of the image recorded by the photosensors of the adjustable optical eyepiece, in which the minicomputer counts the refraction of the studied eye in this meridional direction. After that, the narrow slit of the optical part is automatically transferred to a new meridional position and the process of determining the refraction of the studied eye in a new meridional direction is repeated. The patient is required to maintain a fixed position of the head in the setup and look at a special mark on the internal screen of the device. Since the measurement conditions require the patient to keep the head position and gaze fixed, and this requirement is difficult for the patient to fulfill, complex units for tracking the position of the head and gaze of the patient are introduced into the prototype, which makes the device more expensive and complicated. After processing by the minicomputer of the data taken from the photosensors in different meridional directions, the device prints the research results on paper. The device records the results only at a certain fixed position of the patient’s head, automatically excluding those measurements when the patient changes the position of the head or the direction of the gaze at a certain point.

Significant disadvantages of the prototype are:

- stress uncomfortable condition of the patient, required to maintain a fixed look at a certain point during measurements;

- high cost and complexity of the device due to the presence of tracking systems for the position of the head and the direction of the patient's gaze;

- the possibility of significant errors due to local deviations from the general distribution of the optical and structural properties of the lens and eye of the patient as a whole.

The technical result of the utility model is to ensure high accuracy in determining the parameters of optical vision correction both for distance and near and for express selection of glasses with an invariant direction of patient gaze and at a significantly lower cost of the device compared to modern autorefractometers.

To achieve a technical result, the optical correction parameters are determined in three meridional directions both far and near, with the patient manually adjusting the stop of the movement of the speckle patterns observed by him [4], using a pen in the form of a spherical segment of the surface of the ball automatically set in one of the three meridional directions.

The appearance of the device shown in Fig.1. The device contains placed on a horizontal ophthalmic table 1 with racks 2, on which the body 3 of the device is placed with the ability to move it vertically to align the height of the optical eyepiece 4 with the patient’s eye. The patient's head drops to the main 5 and additional 6 elements of the installation. Elements 7 ... 11 for controlling the device are placed in the lower part of the housing 3, and a display 12 introduced into the utility model is placed on the front of the housing 3 to inform the patient about the procedure and output the results. Alternatively, force sensors 13 connected to the minicomputer (not shown in FIG. 1) are introduced into the junction of the additional installation element 6 with the main element 5. The left or right position of the patient’s chin on the spring-loaded unit 6 provides the corresponding difference in the forces acting on the left and right sensors 13. Based on the difference of the output signals of these sensors, the minicomputer automatically determines which of the patient’s eyes is aligned with the optical eyepiece 4. In order to display the results on an external computer, a recorder, or an information connector is provided in the information channel on the rear wall of the device case (not shown in FIG. 1). The control element 7 is made in the form of a spherical segment of the surface of the ball protruding from the body with a friction notch in one direction, automatically installed in one of three meridional directions. In each meridional direction, the patient rotates the friction notch in the direction opposite to the direction of movement of the speckle pattern, observed by him through the eyepiece 4, until it stops completely. After stopping the movement of the speckle pattern, the patient presses the “Enter” button 8 to record the state of the optical part of the device in the memory of the minicomputer. Control 9 - the "Cancel" button - is necessary to erase the data that was erroneously entered for one reason or another. Measurements are repeated in two states of the optical part of the device - “Near” and “Far”. By preset briefly pressing the corresponding button 10 or 11. After recording the state of the optical part of the device in one meridional direction, the device automatically transfers element 7 to another meridional direction and the patient stops the speckle pattern using element 7 is repeated in this meridional direction. The actual meridional position of the friction notch on element 7 and the speckle pattern movement coincide, which greatly simplifies the process of stopping the speckle pattern movement for the patient. The instructions displayed for the patient on display 12 contribute to this. Separate control of the eye parameters for near and far is provided by entering or withdrawing an additional lens from the optical system of the device by briefly pressing one of the 10 “Close” or 11 “Far” buttons. After the patient enters the state using the button 8 in the last meridional direction for the near and (or) distance for both eyes of the patient, the minicomputer processes the measurement results in three meridional directions and provides information on the parameters of astigmatic imperfections of the eye and on the display connector 10 for printing the prescription the required parameters of corrective spectacle lenses in the format “sphere, cylinder, axis” adopted in ophthalmology.

The trial operation of the proposed device showed that, compared with the known autorefractometers, the proposed utility model allows the selection of spectacle lenses with an error of no more than 0.2 diopters for both near and far, with the patient's most comfortable condition. The ratio of the cost of known refractometers and the proposed device is not less than 5 to 1, which makes it possible to equip all ophthalmic rooms in schools, enterprises and institutions with this device.

INFORMATION SOURCES.

1. Autorefractometers. Website http://www.ameqs.ru of the group of companies Amegs medical inc.

2. Refractometers supplied by Stormoff. Website http://www.stormoff.ru.

3. Auto-refractometer RM-8800 from Topcon. Website http://www.medcom.ru.

4. RF patent No. 2294131 of 06.23.2005, IPC A61B 3/00, A61F 9/00, A61N 5/067. A device for researching vision and functional treatment in ophthalmology.

LIST OF POSITIONS

to the application for the utility model “A device for determining the parameters of optical vision correction and express selection of glasses”

1 - ophthalmological table

2 - racks / rods / ophthalmological table

3 - instrument housing

4 - optical eyepiece of the device

5 - the main element of the installation

6 - lower element of the installation

7 - control element in the form of a spherical segment of the surface of the ball protruding from the body with a friction notch

8 - control - “Enter” button

9 - control - Cancel button

10 - control - “Close” button

11 - control - “Far” button

12 - display for the patient

13 - force sensors acting on the spring element 6 / right and left /.

Claims (4)

1. A device for determining the parameters of optical vision correction and rapid selection of complex glasses, containing an ophthalmological table and a case with a facial unit, an optical eyepiece located in the upper part of the case, and installation elements in the lower part of the case, as well as a minicomputer and a display the operator and the output connector, characterized in that the controls are located in the lower part of the housing and contain a spherical segment of the surface of the ball protruding from the housing with a friction notch in one direction for impact on it by the patient, automatically installed in the specified meridional directions, as well as the "Enter", "Close", "Distance" and "Cancel" buttons. 2. The device according to claim 1, characterized in that the installation contains an additional element that is spring loaded and equipped with force sensors inserted into the device, located at the junction of the main element of the installation with its additional element and connected to the minicomputer. 3. The device according to claim 1, characterized in that the housing of the device is placed on racks (bars) rigidly fixed to the ophthalmic table with the possibility of adjusting the position of the housing in height. 4. The device according to claim 1, characterized in that for the transfer of the optical system from the position of focusing the eyes to a distance in the state of focusing the eyes for close to the system introduces an additional lens.