JPH02283349A - Ophthalmic apparatus - Google Patents

Abstract

PURPOSE:To carry out measurements efficiently and to enable a subject to be prevented from a pain due to repeated measurements in an improper measure range by adopting a configuration wherein a measure range is turned over to another one in case that two or more measurements are successively impossible in that range. CONSTITUTION:An intraocular pressure measurement part 1 is equipped with an air puff ejection part 10, a cornea deformation detection part 20 and and intraocular pressure measurement and control circuit 30, to which a pressure detection circuit 31, an applanation detection circuit 32, an auto/manual selector switch 40, a measure range selector switch 41, a printer switch 42 and a clear switch 43 are connected. A low measure range setting part 50 and a high measure range setting part 51 are connected to a solenoid actuation circuit 14 through the measure range selector switch 41. When two or more cases, wherein a measurement is impossible, occur successively, a possibility of higher intraocular pressure of the subject eye than a set level is judged to be high and the measure range is changed over to another one by this configuration, so that a possibility of repeating measurements in an incorrect measure range is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in an ophthalmologic apparatus that can perform measurements by switching between one measurement range and another measurement range.

(Prior Art) In conventional ophthalmological devices, such as non-contact tonometers, the measurement range can be switched in two stages in order to widen the measurable range without causing discomfort to the patient. It is known what made it possible. In this device, the first measurement range is the low measurement range, that is, the measurement is performed by emitting air with weak air pressure.
If the patient's intraocular pressure value is too high to be measured in this low measurement range, the examiner manually switches to another high measurement range, releases air with strong air pressure, and performs the measurement again. That's what I do. On the other hand, with this type of ophthalmological device, the measurement result shows that the intraocular pressure value of the eye being examined is high.
The measurement range for which accuracy can be guaranteed may be exceeded. Therefore, some ophthalmological apparatuses are configured to automatically detect when the measurement range has been exceeded, display a "measurement over-display" on the display, and prompt the examiner to switch the measurement range.

(Problems to be Solved by the Invention) By the way, with this conventional ophthalmological apparatus, if the intraocular pressure value of the eye to be examined exceeds a predetermined level, measurement itself cannot be performed, and in this case, the display shows " Instead of a ``measurement over'' display, an ``error display'' indicating that the measurement itself cannot be performed is displayed.

In this case, even though the subject's IN pressure value is as high as 11 yen, and the measurement range must be changed at the end, the display shows a vanilla display. It is difficult to distinguish between poor alignment adjustment or failure to measure due to flycatcher. There is a problem in that patients often make the mistake of repeating wasteful measurements, which takes time and causes pain to the subject during the measurement.

The present invention has been made in view of the above-mentioned problems in the conventional technology of ttYi, and automatically switches the measurement range between the measurement I/range and other measurement ranges, thereby improving the efficiency of measurement. It is an object of the present invention to provide an ophthalmological device that can reduce the patient's name pain due to repeatedly performing measurements at an inappropriate gl++ constant range. This is the purpose.

(Means to Solve the Problem) In order to achieve the above-mentioned objective 1-1, the ophthalmological apparatus according to the present invention is capable of all + constant measurement by switching between one measurement range and the other 4111 fixed range. This ophthalmological apparatus is characterized in that it is provided with a switching control section that automatically switches to another measurement range when it is not possible to carry out multiple measurements in succession in one measurement range.

(Function) According to the ophthalmological apparatus according to the present invention, when the case where measurement cannot be performed continues multiple times in a row (for example, when the same error display is displayed multiple times in a row), the eye to be examined is It is determined that there is a sufficient possibility that the intraocular pressure value is higher than the specified level, and the measurement is automatically switched from one measurement range to another, and the measurement range is automatically switched from one measurement range to another. It is possible to reduce the amount of effort f1 that would otherwise result in repeated measurements.

(Example) Hereinafter, an example of the contact type intraocular pressure side of the ophthalmologic apparatus according to the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, 1 is a 1ilu pressure measuring section. This intraocular pressure measurement unit 1 directs fluid such as air toward the cornea C of the eye E to be examined, includes an air puff discharge unit 10 for deforming the cornea C, and a corneal deformation detection unit 20. 1ll (control circuit 30, etc.).
A nozzle 11, an air chamber 12, a piston and a cylinder (not shown) are included, and the air chamber 12 is provided with a pressure sensor 13. The nozzle 11 is for discharging air, and the pressure sensor 13 is for measuring the air pressure in the air chamber 12. A piston is slidably fitted into the syringe, and the piston is not shown. It is driven by a solenoid, which is energized by a solenoid drive circuit 14. When the piston is driven, air in the cylinder is jig into the air chamber 12.
The air in the air chamber 12 is discharged from the nozzle 11 toward the eye E to be examined.

The corneal deformation detection system 20 consists of a pair of optical systems arranged symmetrically with respect to the axis On of the nozzle 11. FIG. 1 shows the schematic configuration of the pair of optical systems.
1 is a light emitting element, 22 is a projection lens, 23 is an imaging lens,
24 is a light receiving element. The light emitting element 21 is driven by a light emitting element drive circuit 25, and the light from the light emitting element 21 is converted into a parallel light beam by a projection lens 22, and is projected toward the cornea C from an oblique direction.

The light reflected by the cornea C is focused by the imaging lens 23,
An image is formed on the light receiving surface of the light receiving element 24. Note that the light receiving element 2
The light-receiving surface 4 is located at the point position of the imaging lens 23.

The intraocular pressure measurement and control circuit 30 includes a light emitting element drive circuit 2.
5. A pressure detection circuit 31, an applanation detection circuit 32, an automatic manual changeover switch 40, a measurement range changeover switch 41, a printer switch 42, a clear switch 43, a printer 44, and a display 52 are connected.

The auto-manual changeover switch 40 has two modes: an auto measurement mode in which air pulses are automatically released based on the month when alignment is completed, and a manual measurement mode in which air is released by the examiner manually operating the measurement start switch 45. Press 1 to 11 to turn the refresh function H.

When the automatic manual changeover switch 40 is set to O1 in the measurement mode, the solenoid drive circuit 14 outputs a solenoid drive signal based on the alignment completion signal from the alignment detection means 46. Furthermore, when the all-manual changeover switch 40 is in the manual measurement mode,
Based on the operation of the measurement start switch 45, the solenoid drive circuit 14 outputs a solenoid drive signal.

The alignment detection means 46 includes an alignment detection section 47
, a reference signal generator 48 and a comparator 49. The alignment detection section 47 has a charge conversion element (not shown). This charging conversion element is
This corresponds to the one disclosed in Japanese Patent Application No. 4128 and the one described in Japanese Patent Application No. 1983-54999, which was previously filed by the applicant.

The output signal from the alignment detection section 47 and the reference signal from the reference signal generator 48 are input to a comparator 49,
The comparator 49 compares the reference signal and the output signal to determine whether alignment adjustment is completed. Then, the comparator 49 outputs an alignment completion signal to the auto-manual changeover switch 40 when the alignment adjustment is completed. When the auto-manual changeover switch 40 is in the auto measurement mode, the solenoid drive circuit 14 is automatically driven based on the alignment completion signal from the comparator 49, and the emission of air pulses is automatically started. On the other hand, when the auto-manual changeover switch 40 is in the manual measurement mode, when the measurement start switch 45 is operated, the solenoid drive circuit 14 is driven in response to the operation of the measurement start switch 45, and the emission of air pulses is started.

That is, by driving this solenoid drive circuit 14,
The solenoid is energized, the piston is driven, the pressure within the air chamber 12 increases by 1, and the ejection of air pulses begins, while the pressure is sequentially detected by the pressure sensor 13. The detection output is input to the pressure detection circuit 31 as detected pressure data.

This detected pressure data corresponds to the pressure of air as a fluid discharged from the nozzle 11. On the other hand, the amount of corneal reflected light from the cornea C in the process of deforming the cornea C by a predetermined amount is sequentially detected by the light receiving element -/- 24, and a reflected light amount signal based on the amount of corneal reflected light is input to the applanation detection circuit 32. .

The applanation detection circuit 32 digitally transmits the reflected light amount signal)B
It has the function of converting into reflected light amount data.

The pressure detection circuit 31 detects the applanation detection circuit 32 every time the detected pressure data from the pressure sensor 31 increases by a predetermined unit pressure.
It has a function of storing corneal reflected light quantity data detected by the intraocular pressure measurement and control circuit 30 in the RAM. Therefore, each time the detected pressure data of the pressure detection circuit 31 increases by 1, the addresses of the RAM are updated using the predetermined unit pressure as a scale. The amount of reflected light data from the camera will be stored in memory. As a result, the RAM stores a pressure-light amount function in which the horizontal axis is the detected pressure and the amount of corneal reflected light is the vertical axis. 111 (The pressure measurement and control circuit 30 uses the pressure-light intensity function stored in its RAM to determine the amount of light reflected by the cornea when the cornea C is applanated (see reference numeral C' in FIG. 1) and reaches its maximum level. Detected pressure data is obtained, and based on this detected pressure data, the intraocular pressure of the eye E to be examined is determined.

The maximum discharge pressure of the air pulse is determined by the measurement range set by the measurement range changeover switch 41.

The measurement range selector switch 41 is the solenoid drive circuit 1
4 between a low measurement range and a high measurement range, and a low measurement range setting section 50 and a high measurement range setting section 51 are connected to the solenoid drive circuit 14 via a measurement range changeover switch 41. ing. When the measurement range changeover switch 41 is set to the low measurement range, the solenoid drive circuit 14 drives the solenoid so that air pulses are emitted according to the time-pressure curve shown by symbol A in FIG. 2, and the measurement range is changed over. When switch 41 is set to the high measurement range, it drives the solenoid so that air pulses are emitted according to a time-pressure curve as shown at B in FIG.

Here, in the low measurement range, the solenoid drive circuit 14 drives the solenoid to increase the pressure linearly until the air pressure reaches 30 mmHg, and then cuts off power to the solenoid to detect excessive air pressure. person's eye to be examined E
are prohibited from giving it to However, since there is inertial movement of the piston, the time-pressure curve increases even after the energization to the solenoid is stopped, and gradually decreases after the maximum discharge pressure P.

Measurement accuracy is maintained in this low measurement range.1. Possible range 11
)1, the pressure increases linearly up to a range of 30 m:I (g), and if the pressure exceeds this range, the display 52 will indicate that the low measurement range has been exceeded (measurement over).

If the low measurement range is exceeded, the examiner can manually switch the measurement range changeover switch 41 from the low measurement range to the high measurement range to perform measurement.

Here, if the intraocular pressure value of the subject is less than the maximum discharge pressure P in the low measurement range, the test eye E in this low measurement range is
Cornea C will not be applanated.

Therefore, the applanation signal from the applanation detection circuit 31 does not reach the predetermined level pressure, and measurement cannot be performed.

In this case, the display 52 displays an error message indicating that measurement cannot be performed, instead of indicating that the measurement is over.

When the intraocular pressure measurement and control circuit 30 enters the error display state, it starts counting the number of error displays.

The intraocular pressure measurement and control circuit 30 switches the measurement range changeover switch 41 from the low measurement range to the high measurement range when this error display continues twice. In other words, the lug If δ11 constant and control circuit 30 also functions as a switching control section that automatically switches to another measurement range when one measurement range cannot be used for multiple consecutive measurements. The resulting air pulse can be emitted with a roar. Here, the range where measurement accuracy can be guaranteed in the high measurement range is 60mmHg where the pressure increases linearly.
up to the range of

Note that if an error is displayed in the -th measurement and no error is displayed in the second measurement, the number of error displays is cleared. Here, the low measurement range is switched to the high measurement range when the error display count is 2 or more, but it may be switched from the low measurement range to the high measurement range when the error display count is 3 or more. .

The intraocular pressure value obtained by this non-contact tonometer is displayed on the printer 4 by operating the printer switch 42 after the measurement is completed.
4, while the data stored in the RAM is erased. Also, if you operate the clear switch 43 after the measurement is completed, the R
The data recorded in AM is erased. When this printer switch 42 and clear switch 43 are turned on,
The intraocular pressure and control circuit 30 includes a measurement mode changeover switch 4
It has a function of switching the measurement range changeover switch 41 from the high measurement range to the low measurement range. Therefore, after completing the measurement of the previous subject, when moving on to the measurement of the next subject, the ophthalmologic apparatus is automatically set to return, which is convenient.

In other words, with a non-contact tonometer, in order to avoid causing undue discomfort to the patient, the measurement is started from the low measurement range, and if measurement cannot be performed in the low measurement range, the measurement is switched to the high measurement range. However, once the previous subject has been set to the high measurement range, it is possible to save the trouble of manually resetting from the high measurement range to the low measurement range when measuring the next subject. Become.

In addition, even after measuring a subject in manual measurement mode, when moving to δIII measurement for the next subject, the automatic measurement mode is automatically returned to, which improves measurement efficiency. - can be M.

(Effects of the Invention) Since the ophthalmic apparatus according to the present invention is configured as described above, it is possible to automatically switch the measurement range between one measurement range and another measurement range to efficiently perform measurements. The present invention has the effect of making it possible to prevent the subject from suffering due to repeatedly performing measurements in an inappropriate measurement range.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of main parts when the ophthalmologic apparatus according to the present invention is applied to a non-contact tonometer, and FIG. 2 is a graph for explaining a time-pressure curve. 10... Air puff release unit] 3... Pressure sensor 14... Solenoid drive circuit 20... Corneal deformation detection system 30... Intraocular pressure measurement and control circuit (1ilJ replacement control unit) 31... Pressure Detection circuit 32...Applanation detection circuit 40...Auto manual changeover switch 41...
Measurement range changeover switch 42...Printer switch 43...Clear switch 50...Low measurement range setting section 51...High measurement range setting section Display of procedural amendment form case Heisei J Patent Application No. 1.06352 Relationship with the case of the person who amended the name of the invention for eye-sighting Applicant name: Co., Ltd. 1. Bucon Agent Address: 1-14-3 Monzennakacho, Koto-ku, Tokyo 1-14-3, 135 Telephone: 03-820-1811 Heisei Gen. June 30th, 2018 (Delivery port: July 25th of the same year) Drawings subject to amendment

Claims (1)

[Claims] (1) In an ophthalmological device that can perform measurements by switching the measurement range between one measurement range and another, if it is not possible to perform multiple consecutive measurements in one measurement range, the measurement range is automatically switched to the other measurement range. An ophthalmological apparatus characterized by being provided with a switching control section for switching.