JPH04144536A - Ophthalmic apparatus - Google Patents

Abstract

PURPOSE:To surely discriminate the left and the right eyes by aligning one eye each with an inspection system and executing a measurement or photographing, and simultaneously using a movement of an abutting member, in a state that the abutting member is moved and allowed to abut on a part of a face part of a person to be examined. CONSTITUTION:For instance, in the case of measuring the left eye, a turning member 14 is turned counterclockwise, and a person P to be examined allows a forehead abutting member 18 to abut on the forehead part, reflects the own eye E to be examined on a concave mirror 9 and adjusts a position of the face part by himself so that the cornea center and the center of a nozzle 8 are positioned. However, the working distance adjustment to the nozzle 8 is executed in a state that the forehead abuts on the forehead abutting member 18, and also, the iris can be observed in the best focused state. After the alignment is finished, an ophthalmic pressure measurement is executed several times, and thereafter, the person P to be examined turns clockwise the forehead abutting member 18 by the turning member 14, and executes the alignment and the measurement in the same way. In this case, by a movement of the turning member 14, a microswitch 19 is varied from a turn-on state to a turn-off state, and it is discriminated that the left and the right eyes are switched.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ophthalmological device that can be used even at home.

[Prior Art] In recent years, as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-276533, it has become possible for the examinee himself to operate the positioning, measure intraocular pressure, etc., and take pictures. Ophthalmological devices are known. This type of device has the convenience of being able to easily measure intraocular pressure values at home, for example, but since the person measuring the device is not an expert, it is necessary to devise a device that allows for accurate and easy positioning.

FIG. 7 shows a conventional ophthalmological device in which the examiner performs positioning. The face of the subject P is fixed to the fixed face support part 5, and the examiner uses the operation stick 4 to move the measuring part 3 in three-dimensional directions with respect to the subject's eye for positioning. . At this time, a microswitch 6 is attached to the movable base 2, and the relative position of the movable base 2 with respect to the base 1 is determined by the on/off state of the microswitch 6.
It is possible to detect whether the eye is on the right side or the left side of the eye, and the left and right eyes in the measurement state can be determined. This detection can be similarly performed using a photosensor.

FIG. 8 shows a conventional ophthalmological device in which the patient P himself aligns the position. A rod 4 is attached, and the subject P is placed on a plate support 5 which is also fixed to the base 1.
The subject P performs similar positioning using the measurement unit 3 while fixing the face of the patient. In this case as well, a microswitch 6 is attached to the lower part of the movable table 2 to determine whether to switch between the left and right eyes.

[Problems to be Solved by the Invention] However, the above-mentioned conventional example is suitable for cases where relatively high-precision positioning is required. The left-right width dimension is large, including the device with a mechanism for switching between left and right eyes by placing the face on a member corresponding to optometry, and when used at home, it is large and inconvenient to carry. In addition, subject P
When aligning by moving your face,
Although the movable table 2, the operating rod 4, and the surface support stand 5 are no longer necessary, the size can be reduced, but the left and right eye detection switches such as the microswitch 6 cannot be used, and the left and right eyes in measurement values are not clearly distinguished.

In addition, in the case of a hand-held ophthalmological device that the examinee P himself uses to measure and manipulate one eye at a time, the examinee P himself can input a switch, etc. at any time, so that the measured value can be changed to the right or left eye. Although it is possible to distinguish between different types of objects, there is also the risk of forgetting to press the switch, which may impede diagnosis.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide an ophthalmological device that is compact and capable of reliably distinguishing between left and right eyes.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the ophthalmological device according to the present invention aligns each eye of a subject to a single examination system to perform measurement or measurement. An ophthalmological device that performs imaging includes: a contact member that contacts a part of the face of a subject; a moving means that moves the contact member in the left-right direction with respect to the examination system by rotating or linearly moving the contact member; The present invention is characterized by having a discriminating means for detecting movement of the contact member and discriminating between left and right eyes.

[Operation] The ophthalmological equipment having the above-mentioned configuration moves the abutting member to abut a part of the examinee's face, aligns one eye with the examination system one by one, and performs measurement or photography. At the same time, the left and right eyes are discriminated using the movement of the abutment member.

[Example] The present invention will be explained in detail based on the example illustrated in FIGS. 1 to 6.

FIG. 1 shows a side view of a first embodiment in which the present invention is applied to a tonometer, and FIG. 2 shows a front view from the subject P side. The optical base 7 is provided with a nozzle 8 that faces the eye E to be examined and aligned with the ocular axis O, and a concave mirror 9 that holds the nozzle 8 and a perforated glass 10 are arranged from the eye P side. In order to inject air through the nozzle 8, the optical base 7
A piston 11 is provided in the lower cylinder 7a, and the piston 11 is driven by a solenoid 12. A bearing 13 is provided at the top of the optical base 7, and a rotating member 14 is mounted on this bearing 13 to rotate in the direction of the arrow in FIG. 2 via a shaft 14a. possible to be mated. The holding member 15 is attached to the rotating member 14 via a bolt 16, a collar 17, and a nut 14b fixed to the rotating member 14, and a forehead abutting member 18 is attached to the subject P side of the holding member 15. The forehead abutting member 18 is attached to the holding member 15 and is movable in the front-rear direction parallel to the eye axis O. Further, a microswitch 19 is attached to the left side of the optical base 7, and when the rotating member 14 rotates leftward and becomes horizontal, the microswitch 19 is moved by the rotating member 14.
9 is pressed to turn it on.

In the above configuration, for example, when measuring the left eye,
As shown in FIG. 2, rotate the rotating member 14 to the left,
The subject P abuts the forehead abutting member 18 against the forehead, reflects his or her eye E on the concave mirror 9, and adjusts the position of the face by himself or herself so that the center of the cornea and the center of the nozzle 8 coincide. However, the working distance adjustment for the nozzle 8 is performed with the forehead in contact with the forehead contact member 18, and the radius of curvature of the concave mirror 9 is set so that the iris can be observed in the best focus state. After the positioning is completed, current is applied to the solenoid 12 to raise the piston 11, and air is injected into the eye E through the nozzle 8 to measure the intraocular pressure.

After performing such intraocular pressure measurement several times, the subject P rotates the forehead abutting member 18 to the right side in FIG. 2 using the rotating member 14, and performs a similar alignment measurement. At this time, the microswitch 19 changes from the on state to the off state due to the movement of the rotating member 14, and it is determined that the left and right eyes have been switched. Note that the discrimination between left and right eyes may be performed by using, for example, a photodiode switch instead of a microswitch.

In this first embodiment, the holding member 15 and the forehead contact member 18 can be adjusted in position continuously or stepwise, and can sufficiently withstand the pressure even if the subject P strongly contacts the forehead. Furthermore, a stopper (not shown) is provided for the rotational movement of the rotating member 14 to prevent excessive rotation.

Further, by moving the holding member 15, the forward contact member 1
It is also possible to maintain the upper and lower sides of the forehead contact member 18 constant without switching between the left and right sides, and it is also possible to realize a structure in which the upper and lower sides of the forehead contact member 18 are reversed by switching between the left and right sides other than this embodiment.

FIG. 3 shows a configuration diagram of main parts of the second embodiment, and FIG. 4 shows a cross-sectional view taken along line A-A in FIG. 3, and the same reference numerals as in FIG. 1 indicate the same members. ing.

A support member 20 is fixed to the upper part of the optical base 7, and the forehead contact member 18° is connected to the support member 20 via a rail 21.
The forehead abutting member 18° can be smoothly moved from side to side. There is a bin 22 on the left side of the rail 21.
is provided, and when the forehead contact member 18° moves to a fixed position on the right side, a microswitch 19 fixed to the support member 20 is pressed to turn it on. This is similar to the example.

In this embodiment, when measuring the opposite silver after measuring with one eye, when the forehead contact member 18° is moved in the left and right direction along the rail 21, the micro switch 19 is turned on or off, and the right and left eyes are turned on or off. It can be determined that it has been replaced.

Although omitted in this embodiment, as in the first embodiment, the forehead contact member 18° can be adjusted in position in the direction along the eye axis 0 according to the subject's forehead. Preferably, a stopper may be provided to position the movement in the left and right direction.

FIG. 5 shows a third embodiment in which the forehead abutting member is also used as an eyecup in order to avoid difficulty in fixating the concave mirror 9 due to the influence of external light. A nozzle barrel 23 is screwed to the optical base 7, and an elliptical eyecup 24 as shown in the front view of FIG. 6 is fixed eccentrically to the tip of the nozzle barrel 23. Member 25
is attached so that it can rotate half a rotation around the optical base 7. A pin 26 is attached to the rotating member 25, and when the eye cup 24 is rotated to the position shown in FIG. It is set to press 19.

In this way, if the eyecup 24 is shaped like an ellipse and attached eccentrically, the eyecup 18 can be adjusted when replacing the left and right eyes.
It becomes necessary to turn the lens half a turn, and at that time, the microswitch 19 is turned on or off, so that switching between left and right eyes can be accurately determined.

Although the three embodiments described above are all applied to a tonometer, they can be applied to various types of ophthalmological equipment in which the subject P performs self-alignment. Furthermore, the present invention can also be applied to ophthalmological equipment operated by an examiner, such as conventional ophthalmological equipment.

[Effects of the Invention] As explained above, the ophthalmological device according to the present invention is capable of positioning, measuring, and photographing one eye at a time while moving the abutting member and abutting a part of the subject's face. At the same time, the left and right eyes are discriminated using the movement of the contact member, so the left and right eyes can be discriminated accurately and reliably, making it effective to apply to ophthalmological equipment operated by the patient himself. It is true. In addition, it has a simple configuration, and even when operated by an examiner, the amount of left-right movement of the abutment member of the inspection system is small, allowing for miniaturization, and it can be used in a small space.

[Brief explanation of drawings]

Drawings 1 to 6 show embodiments of the ophthalmological equipment according to the present invention, in which FIG. 1 is a configuration diagram of the first embodiment, FIG. 2 is a front view, and FIG. 3 is a second embodiment. The configuration diagram of Fig. 4 is A of Fig. 3.
-A sectional view taken along the line A, FIG. 5 is a configuration diagram of the third embodiment, FIG. 6 is a front view of the eye cup, and FIGS. 7 and 8 are configuration diagrams of the conventional example. 7 is an optical base, 8 is a nozzle, 14.25 is a rotation member, 15 is a holding member, 18.18' is a forehead contact member, 19 is a micro switch, 20 is a support member, and 24 is an eyecup. . Patent applicant: Canon Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] 1. In ophthalmological equipment that measures or photographs the examinee's eyes by aligning them one eye at a time with a single examination system, there is a contact member that comes into contact with a part of the examinee's face, and a corresponding contact member. An ophthalmology clinic characterized by having a moving means for moving a member in the left-right direction with respect to the examination system by rotating or linearly moving the member, and a discriminating means for detecting the movement of the abutting member and discriminating between left and right eyes. device.