JP2001037722A - Ophthalmological device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and rapidly adjust an alignment by constituting an ophthalmological device to largely move a device main body by means of the operation of an operation member in the case of a large position deviating quantity between an eye to be inspected and the device main body and reducing the movement quantity of the device main body even in the same operation quantity in the case of a small position deviating quantity. SOLUTION: When the device is used, an inspector operates a joystick 102 while viewing the image of a front eye part on a monitor 200, coarsely adjusts the focus of the front eye part and executes the coarse adjustment of the alignment to permit a pupil to enter a scale. After coarsely adjusting the alignment, the motors 104, 107 and 112 of an alignment mechanism I are controlled by the automatic via a control circuit. In this case, an alignment index image is moved to the center of a standard scale by the operation of the joystick 102 by which the movement quantity per unit operation is set to be smaller than that at the time of the coarse alignment when the alignment with high precision is executed to cope with the fixation nystagmus or the like of the eye to be inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus which allows an examiner to manually adjust a positional shift between an eye to be examined and a main body of the apparatus by operating an operation member.

[0002]

2. Description of the Related Art In an ophthalmologic apparatus such as an eye refractive power measuring apparatus and a tonometer, it is necessary to perform alignment (alignment) between a subject's eye and a main body of the apparatus when performing the measurement.

In order to perform this alignment adjustment, an operation member such as a joystick is provided for an ophthalmologic apparatus, and the position of the apparatus main body with respect to the eye to be examined is adjusted by operating the operation member (tilting, rotating, etc.). Have been.

This ophthalmic apparatus has a structure in which, when the joystick is tilted or rotated greatly, the apparatus body moves largely, and when the joystick is rotated or tilted small, the apparatus body moves small. The amount of movement of the apparatus main body is changed according to the amount of operation of the joystick to speed up alignment adjustment (Japanese Patent Laid-Open No. 9-98951, etc.).

[0005]

However, an ophthalmologic apparatus such as a non-contact tonometer requires extremely high-precision alignment adjustment, and therefore requires very fine adjustment near the alignment completion position. If a beginner who is unfamiliar with the operation performs this alignment adjustment, too much force may be applied to the hand for operating the operation member and may pass through the alignment completion position, making it difficult to perform fine alignment adjustment.

In order to easily perform this fine alignment adjustment, the configuration is such that the moving amount of the apparatus main body with respect to the operation amount of the joystick is reduced in advance, for example, the moving amount of the apparatus main body with respect to the operation amount of the joystick is halved. However, with such a configuration, when the amount of displacement of the apparatus main body with respect to the subject's eye is extremely large, it is necessary to operate the joystick twice as many times, which causes a problem that the operation is troublesome.

[0007] The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an ophthalmologic apparatus that allows an examiner who is unfamiliar with the operation to easily and quickly perform alignment adjustment.

[0008]

In order to achieve the above object, an ophthalmologic apparatus according to a first aspect of the present invention includes a device main body that requires a predetermined alignment with an eye to be inspected, and a manual operation by an examiner. An operation member that adjusts the position of the apparatus main body by operation; an operation amount detection unit that detects an operation amount of the operation member; and a control unit that controls a movement amount of the apparatus main body based on an output of the operation amount detection unit. In the ophthalmologic apparatus provided with the above, the control means, when the displacement amount between the eye to be inspected and the device main body is large, when the displacement amount between the eye to be inspected and the device main body is small The moving amount of the device main body is controlled so that the moving amount of the device main body per unit operation amount of the operation member becomes larger than that of the operating member.

An ophthalmologic apparatus according to a second aspect of the present invention is characterized in that the ophthalmologic apparatus is provided with an alignment state detecting means for detecting a positional shift amount between the subject's eye and the apparatus main body.

According to a third aspect of the present invention, the ophthalmologic apparatus has an automatic alignment control mechanism for automatically aligning the apparatus body when the amount of the positional shift is within a predetermined range, and detecting the alignment state. The amount of displacement detected by the means is
If the position is outside the range in which the automatic positioning control can be performed, the moving amount of the apparatus body per unit operation amount of the operating member is set to a constant speed, and the positional deviation amount is set to the automatic positioning control. When the distance is within the range in which the operation can be performed, the moving amount of the apparatus main body per unit operation amount of the operation member is set to be lower than that when the operation member is out of the range.

According to a fourth aspect of the present invention, in the ophthalmologic apparatus, when the displacement amount is within a range in which automatic alignment control can be performed, the movement amount of the device main body per unit operation amount of the operation member However, it is characterized in that it becomes smaller corresponding to the smaller the displacement amount.

According to a fifth aspect of the present invention, in the ophthalmologic apparatus, when the amount of displacement is within a range in which automatic alignment control can be performed, the amount of movement of the device body per unit operation amount of the operation member Is kept constant.

An ophthalmologic apparatus according to a sixth aspect of the present invention is provided with a stopping means for stopping the automatic positioning, and the rough positioning between the subject's eye and the apparatus main body is manually operated by using the operation member. Performing, the automatic positioning control is performed based on the positional deviation amount output from the positioning state detection unit after the completion of the rough positioning, after the automatic positioning control is stopped by the stopping unit, The positioning adjustment with respect to the apparatus main body can be performed by manual operation using the operation member.

By using such an ophthalmic apparatus,
When the displacement between the subject's eye and the apparatus main body is large, the apparatus main body can be largely moved by operating the operation member, and when the displacement is small, even if the amount of operation is the same, the apparatus main body can be moved. Since the amount of movement can be reduced, delicate operation of the operation member is not required, and alignment adjustment can be performed easily, quickly, and with high accuracy.

[0015]

FIG. 1 schematically shows an eye refractive power measuring apparatus 1 applied to the present invention.

The eye-refractive-power measuring apparatus 1 includes a base 100,
It is roughly composed of a gantry 101 and an alignment mechanism I.

[Overall Configuration] The base 101 is a base 100
Are provided so as to be movable in the front-rear direction (hereinafter, referred to as Z direction) and in the left-right direction (hereinafter, referred to as X direction),
By moving the gantry 101, the apparatus main body H can be moved back and forth, right and left. The configuration of the apparatus main body H will be described later.

The alignment mechanism I is provided on the gantry 101. The alignment mechanism I includes an elevating mechanism I1, a laterally moving mechanism I2, and a forward and backward moving mechanism I3.

The elevating mechanism I1 includes a motor 104 fixed to the upper portion of the gantry 101, and a column 105 held by the motor 104 so as to be movable up and down (hereinafter, referred to as Y direction) with respect to the gantry 101. Have this pillar 10
The table 106 is fixed to the upper end of the table 5.

The horizontal movement mechanism I2 includes a column 108 and a motor 107 fixed on a table 106, and has a table 109 slidably held in the X direction at the upper end of the column 108. A pinion 111 is attached to an output shaft of the motor 107. At the rear end of the table 109, a rack 11 meshed with the pinion 111 is provided.
0 is attached. When the motor 107 rotates,
Table 109 via pinion 111 and rack 110
Moves in the X direction.

The forward / rearward movement mechanism I3 includes a motor 112 and a support 113 fixed to an upper portion of the table 109, and a pinion 114 provided on an output shaft of the motor 112.
And the case 11 of the apparatus main body H disposed on the support 113
Five. The case 115 includes the pinion 11
4 is mounted, and when the motor 112 rotates, the pinion 111 and the rack 110 are rotated.
The case 115 moves in the Z direction via.

The gantry 101 is provided with a joystick 102 for adjusting the position of the apparatus main body H.
The joystick 102 is connected to the axis 10 as shown in FIG.
2A, a rotation unit 102R, a measurement switch 102S, and a ball unit 102B.

The shaft 102A is integrally formed with the ball portion 102B, and the ball portion 102B is rotatably held about a rotation center O by a support (not shown).

Below the ball portion 102B, a ball portion 1 is provided.
Rollers 501 and 502 are provided in contact with the surface of 02B, and rotary encoders 503 and 504 are provided at one end of the rollers 501 and 502.

When the shaft 102A is tilted forward, backward, left and right, the ball portion 102B rotates about the rotation center O, and the rollers 501 and 502 rotate with this rotation.

The amount of tilt operation of the joystick is determined by the amount of rotation of the rollers 501 and 502.
3, 504 to determine.

The rotating unit 102R is rotatably provided on the shaft 102A with the shaft 102A as a rotation axis. Further, the rotating unit 102A has a rotation amount detecting unit for detecting the rotation amount of the rotating unit 102R. 102D is provided. The detection results of the rotary encoders 503 and 504 and the rotation amount detection unit 102D are output to a control system described later, and the alignment mechanism I is controlled based on the detection results.

[Optical System of Apparatus Main Body H] In FIG.
0 denotes a fundus Er to fixate and cloud the eye E to be examined.
Is a fixation target projection optical system, 20 is an observation optical system for observing the anterior segment Ef of the eye E, and 30 is an aiming scale CC.
A scale projection optical system for projecting onto D28, 40 is the eye E
A pattern light beam projection optical system for projecting a pattern light beam for measuring the refractive power of the eye to the fundus Er; a light receiving optical system 50 for receiving the light beam reflected from the fundus Er to the CCD 28;
Reference numeral 0 denotes an alignment light projection system that projects an index light used for detecting an alignment state in a direction perpendicular to the optical axis toward the eye to be inspected, and 70 denotes a working distance for detecting a working distance between the eye to be inspected and the apparatus main body. A detection system, 400 is a signal processing / arithmetic unit, and 200 is a monitor.

The fixation target projection optical system 10 includes a light source 11, a collimator lens 12, a target plate 13, a relay lens 14, a mirror 15, a relay lens 16, and a dichroic mirror 1.
7, 18 and an objective lens 19 are provided.

The visible light emitted from the light source 11 is converted into a parallel light beam by the collimator lens 12 and then collimated.
3 is transmitted. The target plate 13 is provided with a target for fixating and fogging the eye E to be examined. The target light beam passes through the relay lens 14 and is reflected by the mirror 15, is reflected by the dichroic mirror 17 through the relay lens 16, is guided to the main optical axis O 1 of the apparatus main body, passes through the dichroic mirror 18, and The light is guided to the eye E through the lens 19.

The light source 11, the collimator lens 12,
The optotype plate 13 is used to fixate and cloud the optometry eye E.
It is unitized so as to be movable along the optical axis O2 of the optotype projection optical system 10.

The observation optical system 20 includes a light source 21, an objective lens 19, a dichroic mirror 18, a relay lens 22,
An aperture 23, a mirror 24, a relay lens 25, a dichroic mirror 26, an imaging lens 27, and a CCD 28 are provided.

The light beam emitted from the light source 21 is
Is directly illuminated. The light beam reflected by the anterior segment Ef is inverted by the dichroic mirror 18 through the objective lens 19, passes through the relay lens 22, passes through the diaphragm 23 at the same time, is reflected by the mirror 24, and is then reflected by the relay lens 25 and the dichroic mirror. 26, is guided to the CCD 28 by the imaging lens 27,
Monitor 2 from CD 28 via signal processing / arithmetic unit 400
At 00, an anterior eye image is displayed.

The scale projection optical system 30 includes a light source 31, a collimator lens 32 having an aiming scale, a relay lens 33, a dichroic mirror 18, and a relay lens 2.
2, a stop 23, a mirror 24, a relay lens 25, a dichroic mirror 26, an imaging lens 27, and a CCD 28.

The light beam emitted from the light source 31 is converted into an aiming scale light beam (parallel light beam) when passing through the collimator lens 32, and then passes through the relay lens 33, the dichroic mirror 18, the relay lens 22, the diaphragm 23, and the mirror 2.
The light is reflected by the imaging lens 4, passes through a relay lens 25 and a dichroic mirror 26, and is imaged on a CCD 28 by an imaging lens 27. The video signal from the CCD 28 is subjected to signal processing and
The output is output to the monitor 200 via the calculation unit 400, and the aim scale S is displayed on the monitor 200.

At the time of measuring the refractive power after the completion of the alignment, the light sources 21 and 31 are turned off to prevent the CCD 28 from receiving light. A shutter or the like may be provided in the optical path from the dichroic mirror 18 to the dichroic mirror 26.

The pattern light beam projection optical system 40 includes a light source 4
1. Collimator lens 42, conical prism 43, ring index plate 44, relay lens 45, mirror 46, relay lens 47 to which ring-shaped aperture stop 47 'is added, perforated prism 48, dichroic mirrors 17, 18, and objective lens 19 It has.

The light source 41 and the ring-shaped aperture stop 47 'are optically conjugate, and the ring-shaped aperture stop 47' and the eye E
Is located at a position optically conjugate with the pupil Ep.
The light beam emitted from the light source 41 is
Is converted into a parallel light beam, transmitted through the conical prism 43, guided to the ring index plate 44, and transmitted through a ring-shaped pattern portion formed on the ring index plate 44 to become a pattern light beam. After passing through the relay lens 45, the pattern light flux is reflected by the mirror 46, passes through the relay lens 47, is reflected along the main optical axis O1 by the perforated prism 48, passes through the dichroic mirrors 17 and 18, and then passes through the objective. An image is formed on the fundus Er by the lens 19.

The light receiving optical system 50 includes an objective lens 19, dichroic mirrors 18 and 17, a hole 48a of a perforated prism 48, a relay lens 51, a mirror 52, a relay lens 53, a mirror 54, a focusing lens 55, a mirror 56, Dichroic mirror 26, imaging lens 27, CCD 28
Having.

The focusing lens 55 includes a light source 41, a collimator lens 42, a conical prism 43, and a ring index plate 4.
4 can be integrally moved along the optical axes O3, O4 of the optical systems 40, 50.

The light beam guided to the fundus Er by the pattern light beam projection optical system 40 is reflected by the fundus Er, then condensed by the objective lens 19, and is dichroic mirrors 18, 17.
Is transmitted to the hole 48a of the perforated prism 48, and passes through the hole 48a.

The pattern reflected light beam passing through the hole 48a passes through the relay lens 51, is reflected by the mirror 52, passes through the relay lens 53, is reflected by the mirror 54, passes through the focusing lens 55, and passes through the mirror 56. And reflected by the dichroic mirror 26 to form the imaging lens 2
7 reach the CCD 28, which
A pattern image is collected on the top.

The alignment light projection system 60 includes an LED 6
1, a pinhole 62, a collimating lens 63, and a half mirror 64, and have a function of projecting the alignment target light beam toward the cornea of the eye to be examined. The alignment target luminous flux projected as parallel light toward the subject's eye is reflected by the cornea of the subject's eye E, and received by the light receiving optical system 20 through the CCD 2.
8. The alignment target image T is displayed on the monitor 200 via the signal processing / arithmetic unit 400.

The working distance detection system 70 detects the working distance between the subject's eye E and the apparatus main body H. The working distance detecting system 70 projects an index from an infinite distance to an infinite distance target projection system 71R.
71L and finite distance target projection systems 72R and 72L for projecting a target from a finite distance are provided symmetrically with respect to the optical axis O4. The index luminous flux from these four photographing systems is reflected by the cornea, and a target image is projected on the CCD 28 by the light receiving optical system 20. When these optotype images have a fixed positional relationship on the CCD 28, it is detected that the working distance has become a distance W suitable for measurement.

[Control System] The signal processing / arithmetic unit 400 includes a control circuit 401, an A / D converter 402, and a frame memory 4.
03, and DA converters 404 and 405.

The control circuit 401 includes an A / D converter 402,
It is connected to the CCD 28 via the frame memory 403, and also to the rotation amount detector 102D and the rotary encoders 503 and 504 via a signal processing circuit (not shown).

The control circuit 401 includes a frame memory 403
X, based on the video signal from the CCD 28 stored in
Alignment displacement amounts ΔX, ΔY, ΔZ in the Y and Z directions
Is calculated. When performing automatic alignment, the control circuit 401 controls the alignment mechanism I based on the alignment positional deviation amounts ΔX, ΔY, ΔZ, and executes automatic alignment.

On the other hand, when the alignment is performed manually, the control circuit 401 sets the alignment positional deviation amounts ΔX, Δ
The rotation amounts of the motors 104, 107, 112 of the alignment mechanism I are controlled based on Y, ΔZ, and signals from the rotation amount detection unit 102D and the rotary encoders 503, 504.

FIG. 5 shows the relationship between the amount of displacement ΔX in the X direction of the lateral movement mechanism I2 and the amount of motor rotation θ per unit amount of tilt in the X direction of the joystick 102 when performing alignment adjustment by manual alignment. FIG.

The control circuit 401 compares the radius X1 of the aiming scale S shown in FIG. 4 with the positional deviation amount ΔX, and when the positional deviation amount ΔX is larger than the radius X1 of the aiming scale S,
That is, when the alignment target image T is outside the aiming scale S, as shown in FIG.
The motor rotation amount θ per unit tilt amount of 02 is a constant value θma
x.

On the other hand, when the displacement amount ΔX is smaller than the radius X1 of the aiming scale S, that is, when the alignment target image T is inside the aiming scale S, the motor rotation amount per unit tilt amount of the joystick 102 θ is reduced in proportion to the displacement ΔX. That is, control is performed such that the motor rotation amount θ per unit tilt amount becomes smaller than θmax as the alignment target image T approaches the center of the aiming scale S. Therefore, joystick 1
Even if 02 is operated by the same operation amount as when the alignment target image T is outside the aiming scale S, the lateral movement amount of the apparatus main body becomes small.

The control circuit 401 controls the motor rotation amount θ per unit rotation amount of the joystick 102 in accordance with the Y direction displacement ΔY.

The control circuit 401 compares the radius X1 of the aiming scale S with the positional deviation amount ΔY, and when the alignment target image T is outside the aiming scale S, the control circuit 401 per unit rotation amount of the joystick 102. Is a constant value θmax. On the other hand, when the alignment target image T is inside the aiming scale S, the motor rotation amount θ per unit rotation amount of the joystick 102 is reduced in proportion to the positional deviation amount ΔY, so that the alignment target image T Is controlled so that the motor rotation amount θ per unit rotation amount becomes smaller than θmax as the distance approaches the center of the aiming scale S. Therefore, even when the joystick 102 is rotated by the same operation amount as when the alignment target image T is outside the aiming scale S, the vertical movement amount of the apparatus main body is small.

Further, the control circuit 401 controls the motor rotation amount θ per unit tilt amount of the joystick 102 according to the positional deviation amount ΔZ in the optical axis direction.

The control circuit 401 compares the positional deviation amount ΔZ in the Z direction with respect to the appropriate position with the Z direction range Z1 in which automatic alignment can be performed, and if the positional deviation amount ΔZ is larger than the Z direction range Z1. Is a constant value θ of the motor rotation amount θ per unit tilt amount of the joystick 102.
When the displacement amount ΔZ is smaller than the range Z1 in the Z direction, the motor rotation amount θ per unit tilt amount of the joystick 102 is reduced in proportion to the displacement amount ΔZ, so that the displacement amount ΔZ is appropriate. Control is performed so that the motor rotation amount θ per unit tilt amount becomes smaller than θmax as the position approaches. Therefore, even if the joystick 102 is operated by the same tilt amount as when the displacement amount ΔZ is larger than the Z-direction range Z1, the amount of movement of the apparatus main body in the front-rear direction is reduced.

[Operation] Next, the operation of the ophthalmologic apparatus according to the embodiment of the present invention will be described.

First, the examiner operates the joystick 102 while watching the anterior eye image displayed on the monitor 200 to roughly adjust the focus of the anterior eye image so that the pupil enters the scale S. A rough alignment adjustment is performed. As the pupil is adjusted to enter the aiming scale S, the alignment target image T located outside the aiming scale S moves to the center of the aiming scale S.

When the alignment target image T is outside the aiming scale S, rough alignment can be performed with a predetermined motor rotation amount θmax (maximum value) as shown in FIG. The target image T can be moved, and the rough alignment can be quickly completed.

When the general alignment is completed, the automatic alignment is started, and the control circuit 401 controls the motors 104, 107 and 112 of the alignment mechanism I.
When the alignment adjustment with sufficient accuracy is performed by the automatic alignment, the measurement of the eye to be inspected is automatically started.

If the alignment cannot be adjusted with sufficient accuracy by the automatic alignment due to the fixation of the eye to be examined, the automatic alignment is stopped for a predetermined time, and then the automatic alignment is stopped, and the display prompts the examiner to perform the manual alignment. Is displayed on the monitor 200.

The manual alignment is performed by the examiner operating the joystick 102 to move the alignment target image T to the center of the aiming scale S.

Since the amount of misalignment is reduced by performing the automatic alignment for a predetermined time, an extremely delicate joystick operation is required to perform high-precision alignment adjustment. Then, as shown in FIG. 5, the movement amount of the apparatus main body per unit operation of the joystick 102 when the displacement amount is small is set to be smaller than that at the time of the rough alignment (that is, when the displacement amount is large). Therefore, even when the joystick 102 is operated by the same operation amount as the time of the general alignment, the moving amount of the apparatus main body can be reduced, and a high-precision alignment can be performed without performing a delicate operation of the joystick 102. Adjustments can be made easily and quickly.

[Modification] In the embodiment of the present invention, as shown in FIG. 5, the motor rotation amount θ per unit tilt amount of the joystick 102 is controlled in proportion to the positional deviation amount of the alignment mechanism I. However, as shown in FIG. 6, when the alignment target image T is outside the aiming scale S (when the displacement amount ΔX is larger than X1), the motor rotation amount θ per unit tilt amount is uniformly set. θ2, and when the alignment target image T is inside the aiming scale S (when the displacement amount ΔX is smaller than X1),
The rotation amount θ of the motor may be changed stepwise so that the rotation amount θ of the motor per unit tilt amount is uniformly equal to θ3.

By changing the motor rotation amount θ stepwise, the device main body H can be largely moved with a small amount of tilt at the time of general alignment, as in the above-described embodiment. When the joystick 102 is operated with the same operation amount as in the general alignment, the amount of movement of the apparatus main body can be reduced. It is possible to easily and quickly perform high-accuracy alignment adjustment without performing the delicate operation of.

The position shift amount and the joystick 10
Even when the relationship with the motor rotation amount θ per unit tilt amount of 2 is a quadratic function, the same effect as the present invention can be obtained.

Further, in the embodiment of the present invention, the manual alignment is performed after the automatic alignment is performed for a predetermined time. However, the present invention is not limited to this, and the automatic alignment is forcibly stopped. A stop switch may be provided so that manual alignment can be performed by forcibly stopping automatic alignment, or alignment adjustment may be performed only by manual alignment throughout without the automatic alignment operation. Even in such a case, by controlling the relationship between the displacement amount and the motor rotation amount θ per unit tilt amount of the joystick 102 as shown in FIGS. To play.

[0067]

As described above, according to the ophthalmologic apparatus according to the present invention, at the time of general alignment, the main body of the apparatus can be largely moved by the operation member, so that the general alignment can be completed quickly. Also,
In the case of performing the alignment adjustment by manual alignment, even when the operation member is operated with the same operation amount as that in the general alignment, the moving amount of the apparatus main body can be made smaller than that in the general alignment. There is no need to perform a delicate operation using the operation member, and even an inspector unfamiliar with the operation can easily and quickly perform high-accuracy alignment adjustment.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an ophthalmologic apparatus according to the present invention.

FIG. 2 is a perspective view showing an operation member provided in the ophthalmologic apparatus according to the present invention.

FIG. 3 schematically shows an optical system of the ophthalmologic apparatus according to the present invention.

FIG. 4 is an enlarged view of a display image on the monitor shown in FIG. 3;

5 is a graph showing that the motor rotation amount θ per unit tilt amount in the X direction of the joystick 102 shown in FIG. 1 is proportional to the positional deviation amount ΔX in the X direction.

6 is a graph showing a state in which the motor rotation amount θ per unit tilt amount in the X direction of the joystick 102 shown in FIG. 1 changes stepwise with respect to the displacement amount ΔX in the X direction.

[Explanation of symbols]

Reference Signs List 102 operation member 102D rotation amount detection unit (operation amount detection unit) 400 signal processing / calculation unit (control means) 401 control circuit 503, 504 rotary encoder (operation amount detection unit) E eye to be inspected H device main body

Claims (6)

[Claims] 1. An apparatus body which requires a predetermined alignment with an eye to be examined, an operation member for adjusting the position of the apparatus body by manual operation of an examiner, and an operation amount of the operation member is detected. An ophthalmologic apparatus comprising: an operation amount detection unit; and a control unit configured to control a movement amount of the device main body based on an output of the operation amount detection unit. When the displacement amount of the operation member is large, the movement amount of the device body per unit operation amount of the operation member is larger than when the displacement amount between the subject's eye and the device body is small. An ophthalmologic apparatus, wherein the amount of movement of the apparatus main body is controlled. 2. The ophthalmologic apparatus according to claim 1, further comprising a positioning state detecting means for detecting a positional shift amount between the subject's eye and the apparatus main body. 3. The apparatus according to claim 1, further comprising an automatic alignment control mechanism for automatically adjusting the position of the apparatus when the amount of positional deviation is within a predetermined range, wherein the amount of positional deviation detected by the alignment state detecting means is provided. However, if it is out of the range in which the automatic positioning control can be performed, the moving amount of the apparatus body per unit operation amount of the operation member is set to a constant speed, and the displacement amount is set to the automatic position. When the alignment control is within a range in which the alignment control can be performed, a movement amount of the apparatus main body per unit operation amount of the operation member is set to be lower than a case where the movement amount is outside the range. Item 3. The ophthalmologic apparatus according to item 2. 4. When the displacement amount is within a range in which automatic positioning control can be performed, the movement amount of the apparatus main body per unit operation amount of the operation member is smaller than the displacement amount. 4. The ophthalmologic apparatus according to claim 3, wherein the size of the ophthalmologic apparatus is reduced corresponding to the following. 5. The moving amount of the apparatus body per unit operation amount of the operation member is kept constant when the amount of displacement is within a range in which automatic alignment control can be performed. The ophthalmologic apparatus according to claim 3, wherein: 6. An apparatus according to claim 6, further comprising a stop means for stopping said automatic positioning, wherein said rough positioning between said subject's eye and said apparatus main body is manually performed by using said operating member. After the completion, the automatic positioning control is performed based on the positional deviation amount output from the positioning state detecting means, and after the automatic positioning control is stopped by the stopping means, the positioning adjustment for the apparatus main body is performed. The ophthalmologic apparatus according to any one of claims 3 to 5, wherein the ophthalmologic apparatus can be performed by manual operation using the operation member.