JPH11332828A - Ophthalmic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a damage to a foreign object such as a finger even under an unexpected situation, and improve safety by providing a control means which drive-controls an optical system-moving part based on a detected result of the foreign object by a detecting means, and changes a clearance interval between a pedestal part and the optical system-moving part to a state wherein the foreign object may not be pressed. SOLUTION: A control part 140 which stores a control program regarding a rough alignment and a fine alignment or the like for an eye to be inspected, and at the same time, controls a contact sensor 125 and an X directional motor 131a as a control means, is provided. This control part 140 controls a Y directional motor 131b and a Z directional motor 131c constituting respective optical system-driving parts which drive an optical system-moving part in the Y direction and the Z direction, in addition of the X directional motor 131a. Then, the control part 140 stops the X directional motor 131a, and eliminates a pressing force to a foreign object such as a finger based on a detected result from a contact sensor 125. Also, the control part 140 moves the optical system moving part in the separating direction from an initial setting location or the foreign object, based on a detected result from the contact sensor 125.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an ophthalmologic apparatus,
More specifically, the present invention relates to an ophthalmologic apparatus such as a refractometer and a keratometer that performs rough alignment and fine alignment of an apparatus main body with respect to an eye to be inspected and performs ophthalmic measurement of the eye to be inspected.

[0002]

2. Description of the Related Art Conventionally, an ophthalmologic apparatus having a so-called automatic alignment function, that is, light reflected from a cornea of an alignment index light projected on an eye to be examined is guided to an optical sensor of a light receiving optical system, and a detection output of the optical sensor is output. There is known an ophthalmologic apparatus that automatically aligns the apparatus main body with respect to an eye to be inspected on the basis of the above.

In such an ophthalmologic apparatus, an examiner uses a joystick or the like to move a measurement optical axis of the apparatus body to a position near a vertex of a cornea of a subject's eye while watching an image monitor (coarse alignment). When the rough alignment is completed,
A fine automatic alignment is executed by the drive unit based on the output of the optical sensor (fine alignment). Thus, the apparatus main body is arranged at a predetermined position with respect to the eye to be inspected, so that accurate ophthalmologic measurement is performed.

[0004] Such an ophthalmologic apparatus includes a gantry section movably supported by a support base provided on the apparatus main body and performing rough alignment with the eye to be inspected,
It is a common practice to have an optical system moving unit equipped with an optical system for optometry supported movably in the left, right, up and down directions.

[0005]

However, in the case of the above-mentioned conventional ophthalmic apparatus, in order to move the optical system moving unit, the structure between the gantry unit and the optical system moving unit is not completely closed. There are some gaps. As a result,
For example, when this ophthalmic apparatus is exhibited at an exhibition and setting is performed, when a child subject is performing a mischief near the ophthalmic apparatus, a situation occurs in which a finger is inserted into the gap, and in some cases, There is a danger that the gap between the optical system moving unit and the optical system moving unit becomes extremely small due to the movement of the optical system moving unit with respect to the gantry unit, and the amount of driving force acting on the optical system moving unit directly acts on the finger, causing an accident that the finger is damaged.

The present invention has been made in view of the above circumstances, and is intended for use in an unexpected case where a foreign object such as a finger of a subject is inserted into a gap between a gantry and an optical system moving unit. It is an object of the present invention to provide an ophthalmologic apparatus which can avoid damage to foreign substances such as fingers and improve safety.

[0007]

According to the first aspect of the present invention,
A gantry section movably supported by the support base and performing rough alignment with the eye to be inspected, and an optical system moving section movably supported in front and rear, left and right, and up and down directions while having a gap between the gantry section In an ophthalmologic apparatus having: a detecting means for detecting the presence of a foreign substance in a gap between the gantry unit and the optical system moving unit;
An optical system driving unit that performs fine alignment with respect to the eye to be examined by being driven in the left, right, up, and down directions, and controls the driving of the optical system driving unit based on a detection result of foreign matter by the detection unit.
A control means for changing a gap between the gantry and the optical system moving unit to a state in which the foreign matter is not pressed is provided.

According to the present invention, when a foreign substance such as a finger of a subject is inserted into the gap between the gantry and the optical system moving section, the detecting means detects the presence of the foreign substance in the gap. The indicated detection result is sent to the control means. The control unit drives and controls the optical system driving unit based on the detection result of the foreign matter by the detection unit, and sets a gap between the gantry unit and the optical system moving unit.
The state is changed to a state where the foreign matter is not pressed.

Thus, even in the case where a foreign object such as a finger of the subject is inserted into the gap between the gantry and the optical system moving unit, damage to the foreign object such as a finger can be avoided,
The safety of the ophthalmologic apparatus can be improved.

The invention according to claim 2 provides a gantry section movably supported by the support base for performing rough alignment with respect to the eye to be inspected, and a gap between the gantry section,
In an ophthalmologic apparatus having an optical system moving unit supported to be movable in left, right, up and down directions, a DC for driving the optical system moving unit in forward, backward, left, right and up and down directions to perform fine alignment with respect to an eye to be examined An optical system driving unit using a motor; an overcurrent detecting unit configured to detect an overcurrent to the DC motor flowing along with a foreign object entering a gap between the gantry unit and the optical system moving unit; Drive control of the optical system drive unit based on the detection result of the overcurrent by the current detection means,
A control means for changing a gap between the gantry and the optical system moving unit to a state in which the foreign matter is not pressed is provided.

According to the present invention, when a foreign object such as a finger of the subject is inserted into the gap between the gantry and the optical system moving unit, the foreign object such as a finger is driven by the DC motor. Is pressed in the gap, and an overcurrent flows to the DC motor. The overcurrent detecting means detects this state, and the control means drives and controls the optical system driving section based on the detection result of the overcurrent detecting means. Since the gap between the gantry and the optical system moving unit is changed to a state in which the foreign matter is not pressed, foreign matter such as a finger of a subject or the like is inserted into the gap between the gantry and the optical system moving unit. Even in the case of an unexpected insertion, the pressing force against a foreign substance such as a finger can be eliminated to avoid the damage, and the safety of the ophthalmologic apparatus can be improved.

According to a third aspect of the present invention, there is provided a gantry section movably supported by a support base for performing rough alignment with respect to the eye to be inspected, and a gap between the gantry section,
In an ophthalmologic apparatus having an optical system moving unit supported so as to be movable in the left, right, up and down directions, a driving force is applied to the optical system moving unit in front, rear, left, right, and up and down directions to finely adjust the eye to be examined. An optical system driving unit using a motor and a clutch mechanism for performing alignment; and when a foreign object enters a gap between the gantry unit and the optical system moving unit, the clutch system causes the optical system moving unit to move from the motor. The transmission of the driving force to the transmission is buffered.

According to the present invention, when a foreign matter such as a finger of a subject enters the gap between the gantry and the optical system moving unit, the clutch mechanism moves the motor from the motor to the optical system moving unit. Since the transmission of the driving force is buffered, the effect of excessive pressing force on foreign substances such as fingers can be reduced to avoid the damage, and the safety of the ophthalmologic apparatus can be improved. it can.

[0014]

Embodiments of the present invention will be described below in detail.

(Embodiment 1) FIG. 1 is an external view of an ophthalmologic apparatus having both functions of a keratometer and a refractometer, which is an example of an embodiment of the present invention.

As shown in FIG. 1, the ophthalmologic apparatus includes a support base 100 including a fixed base 101 and a movable base 102 in which a device power supply (not shown) is built-in,
The X (horizontal) direction shown in FIG. 1 with respect to the gantry 103 above the gantry 103 and the Y
An optical system moving unit 104 is provided so as to be movable in the (up and down) direction and the Z (front and rear) direction, and a chin receiver 105 for placing the chin on the subject M connected to the fixed base 101 is provided.

The gantry 103 can be moved in the X and Z directions by operating the operation lever 111 together with the moving base 102. The gantry 103 can be moved by operating the operation lever 111. It is possible to move in the Y direction with respect to 102. In addition, the moving base 10
2. The description of the moving mechanism of the gantry 103 will be omitted here.

An operation switch 112 is provided at the center of the top of the operation lever 111 so as to take an image of the eye E to be examined.

FIG. 2 shows an optical system of the ophthalmologic apparatus according to the first embodiment. The gantry 103 and the optical system moving unit 104 which face the subject's eye E of the subject M are provided with optical paths 1 through optical paths. 6 is provided with an optical element described below.

The optical path 1 is an optical system for projecting a target for measuring the refractive power of the eye E to be inspected, and includes a light source 11, a collimator lens 12, a conical prism 13, a measurement target 14,
It comprises a relay lens 15, a pupil relay lens 16, a perforated mirror 17, mirrors 18 and 19, and an objective lens 20.

The optical path 2 is an optical system for receiving an optotype image reflected from the fundus of the eye E to be inspected by the area sensor 28, and includes an objective lens 20, mirrors 19 and 18, a perforated mirror 17, a pupil relay lens 21, It comprises a mirror 22, a relay lens 23, a moving lens 24, mirrors 25 and 26, an imaging lens 27, and an area sensor 28.

An optical path 3 is an optical system for observing an anterior segment image of the eye E to be inspected.
1, 32, relay lens 33, collimator lens 3
4, an area sensor 28 including a mirror 26, an imaging lens 27, a CCD element and the like.

The area sensor 28 is connected to an image processing unit 81 for performing image processing of the eye data and a display unit 82 for displaying an image of the eye image.

The optical path 4 is an optical system for fixating and fogging the eye E to be examined, and includes a light source 41, a collimator lens 42, a fixation target 43, a relay lens 44, a pupil relay lens 45, a mirror 46, a mirror 18, It comprises a mirror 19 and an objective lens 20.

An optical path 5 is an optical system for adjusting the distance between the eye E and the main body in the optical axis direction. The light source 51, the diffusion plate 52, and the ring-shaped target are arranged in a ring shape in front of the eye E. 53 and a light source 5 for projecting a parallel light beam onto the eye E
4, 55, diffusion plates 56, 57, pin holes 58, 59,
It is composed of collimator lenses 60 and 61. or,
The optical path 5 also serves as an optical system for measuring the radius of curvature of the cornea of the eye E.

The optical path 6 is an optical system for aligning the eye E with the eye E in a direction perpendicular to the optical axis of the main body. The light path 71 is a light source 71, a diffusion plate 72, a pinhole 73, a collimator lens 74, a mirror 32, and a diaphragm 31. , A mirror 19 and an objective lens 20.

Next, referring to FIGS. 3 to 6, the gantry 103 and the optical system moving unit 104 in the first embodiment will be described.
The connection structure with the above will be described.

The gantry 103 and the optical system moving unit 104
Has a gantry cover 123 and an optical system cover 124 over substantially the entire outer periphery.

The gantry cover 123 of the gantry 103 is
As shown in FIG. 3, a flat portion 123 a and a quadrangular cylindrical rising standing in the Y direction are formed on the upper side of the mounting portion 103 so as to cover a wall surface of the mounting portion 103 along the Y direction. And a portion 123b. In the opening area of the rising portion 123b, the optical system moving portion 104 is supported so as to be movable in the X, Y, and Z directions.

The optical system cover 124 of the optical system moving unit 104 has a flat upper surface 124a that covers the upper surface of the optical system moving unit 104, and a square tube that covers the wall surface of the optical system moving unit 104 along the Y direction. And a side surface portion 124b having the shape of a circle.

The rising portion 123b and the side portion 124
A gap G of about several mm to about several tens mm is formed between b and b corresponding to the amount of movement of the optical system moving unit 104 with respect to the gantry 103.

A contact sensor 125 which is a non-conductive type and does not allow a current to flow through a foreign matter 150 such as a finger is arranged over the entire periphery of the rising portion 123b and the side surface portion 124b facing the gap G. I have.

As the contact sensor 125, for example, an electrostatic sensor having an insulating sheet adhered to the surface, an optical sensor in which light emitting elements such as LEDs, and light receiving elements such as phototransistors are connected in a corresponding arrangement are used. The contact sensor 125 may employ a configuration in which the contact sensor 125 is disposed on either or both of the rising portion 123b and the side surface portion 124b.

The optical system moving unit 104 includes a gantry 103
Driving in the X direction by the optical system driving unit 130 arranged above performs fine alignment with respect to the eye E to be inspected.

That is, the optical system driving unit 130 is provided with the configuration shown in FIGS.
As shown in FIG. 2, an X-direction motor 131a, which is a pulse motor, and a driving gear 132 connected to a driving shaft of the X-direction motor 131a are disposed on the upper surface of the gantry 103. Along the X direction by a pair of screw receiving pieces 133 and 134 protruding from the wall surface along the X direction.
A screw body 135 formed in a rod shape and screwed into 4 is arranged,
The driven gear 136 attached to one end of the screw body 135 and the driving gear 132 are screwed together.

Although not shown, an optical system driving section for driving the optical system moving section 104 in the Y and Z directions has the same configuration as the optical system driving section 130.

FIG. 6 shows a main part of a control system according to the first embodiment. The control program stores a coarse alignment, a fine alignment, and the like for the eye E to be inspected.
A control unit 140 is provided as control means for controlling 1a. The control unit 140 controls the X-direction motor 131a.
In addition, a Y-direction motor 131b constituting each optical system driving unit for driving the optical system moving unit 104 in the Y direction and the Z direction,
The Z-direction motor 131c is controlled.

Next, the operation of the ophthalmologic apparatus according to the first embodiment will be described with reference to the case where a foreign object 150 such as a finger of a young child enters the gap G between the rising portion 123b and the side portion 124b. It will be mainly described.

The rising portion 123b of the gantry 103
When a foreign object 150 such as a finger of a young child, for example, enters the gap G between the device and the side surface portion 124b of the optical system moving unit 104, the contact sensor 125 operates and the detection result indicating the presence of the foreign object 150 is obtained. Send to control unit 140. In this case, since the contact sensor 125 is configured as a non-energized type, no current flows to a human body such as a finger of a young child, which is extremely excellent in safety.

The control unit 140 stops the X-direction motor 131a based on the detection result from the contact sensor 125 to eliminate the pressing force against the foreign matter 150 such as a finger. Further, the control unit 140 moves the optical system moving unit 104 to an initial setting position (for example, a center position) based on the detection result from the contact sensor 125, or moves the optical system moving unit 104 to a foreign object. Move in the direction away from 150.

Accordingly, even in the case where the foreign matter 150 such as a finger of the subject enters the gap G between the gantry 103 and the optical system moving unit 104, the foreign matter 15
It is possible to avoid the damage by eliminating the pressing force to zero, and to improve the safety of the ophthalmic apparatus.

Next, with reference to FIGS. 7 to 11, an alignment operation including a coarse alignment and a fine alignment by the ophthalmologic apparatus having the above configuration will be described.

For example, a procedure for aligning the gantry 103 with respect to the eye E when the mode for aligning the center of the cornea of the eye E is selected by the examiner will be described.

The auto-alignment, for example, in the X direction orthogonal to the optical axis formed by the optical system of the gantry 103 and the optical system moving unit 104 is performed according to the principle described below.

That is, the light beam emitted from the light source 71 on the optical path 6 and emitted from the pinhole 73 is projected as a parallel light beam to the eye E to be examined, and is reflected by the cornea of the eye E.

The reflection image of the light beam emitted from the cornea through the pinhole 73 is projected on the area sensor 28 by each optical element in the optical path 3.

When there is a deviation between the optical path 3 and the visual axis of the eye E, a reflection image x of the light beam emitted from the pinhole 73 with respect to the pupil portion in the anterior eye image of the eye E is shown in FIG. As shown in FIG.

When there is no deviation between the optical path 3 and the visual axis of the eye E, the reflected image x of the light beam emitted from the pinhole 73 with respect to the pupil portion in the anterior segment image of the eye E is shown in FIG. It is displayed at the center position as shown in FIG.

The reflected image projected on the area sensor 28 is stored in the storage unit 83 of the image processing unit 81, and the image processing unit 81 calculates the deviation between the optical axis of the optical path 3 and the visual axis of the eye E. It is processed.

The examiner is observed by the optical path 3 and
The coarse alignment is performed while viewing the anterior eye image and the reflected image x of the eye E to be displayed on the display unit 82.

When the reflection image x falls within a predetermined range, the optical system moving unit 104 is moved based on the arithmetic processing by the image processing unit 81. Thereby, the fine alignment of the eye E is automatically completed.

On the other hand, the alignment of the eye E in the Z direction uses the optical path 5. That is, by the configuration of the optical path 5,
Ring-shaped target 5 from a finite distance to the cornea of the eye E
The projection of the luminous flux from No. 3 and the parallel projection of the luminous flux emitted from the pinholes 58 and 59 are performed.

The reflected images from the cornea of the eye E to be inspected by these two types of projections are projected on the area sensor 28 through the optical path 3. Here, when the distance between the subject's eye E and the main body 50 is at the localization value, the reflection images α and β by the pinholes 58 and 59 displayed on the display unit 82 and the reflection image y of the ring-shaped target 53 Is displayed in the reflection image y as shown in FIG.
And the reflected images α and β are aligned at 180 degrees on the circumference of the circle.

If the distance between the subject's eye E and the gantry 103 is too close to the localization value, the reflection images α and β by the pinholes 58 and 59 displayed on the display unit 82 and the ring-shaped target As shown in FIG. 10, the reflection image y of the ring-shaped target 53 is wider than that shown in FIG.
Is located inside the reflection image y.

Further, when the distance from the eye E to be examined is too far from the localization value, the reflection images α and β by the pinholes 58 and 59 displayed on the display unit 82 and the ring-shaped target 53
As shown in FIG. 11, the reflection image y of the ring-shaped optotype 53 becomes smaller than that shown in FIG. 9, and the reflection images α and β by the pinholes 58 and 59 are displayed.
Is located outside the reflection image y.

The relationship between the reflection images α and β by the pinholes 58 and 59 and the reflection image y of the ring-shaped optotype 53 is stored in a storage unit (not shown). The distance to the optometry E is calculated, and fine alignment in the optical axis direction in the Z direction is performed so that the distance becomes a fixed distance or falls within a certain range.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIGS. FIG.
2 and FIG. 13, the first embodiment shown in FIGS.
The same reference numerals are given to the same elements as those in the above configuration.

The basic configuration of the ophthalmologic apparatus according to the second embodiment shown in FIGS. 12 and 13 is the same as that of the first embodiment, but the contact sensor 125 is omitted as shown in FIG. , As shown in FIG.
X-direction motor 131d, Y-direction motor 1
31e, three overcurrent detection circuits 152a, 152b as overcurrent detection means for detecting overcurrents generated in the X direction motor 131d, the Y direction motor 131e, and the Z direction motor 131f, respectively, employing the Z direction motor 131f. , 1
The feature is that 52c is added to the control system. further,
A timer 144 for measuring the time can be added to the control unit 140.

According to this configuration, when a foreign substance 150 such as a finger of a subject enters the gap G between the gantry 103 and the optical system moving unit 104, the DC motor X
Foreign matter 150 such as a finger is pushed in the gap G by the driving force of the direction motor 131d, and the X direction motor 131d
The overcurrent flows to the overcurrent detection circuit 152.
a, the control unit 140 controls the driving of the X-direction motor 131d based on the detection result of the overcurrent detection circuit 152a, and determines the interval of the gap G between the gantry 103 and the optical system moving unit 104, The foreign matter 150 is changed to a state in which it is not pressed in the same manner as described above. Thus, the pressing force against the foreign matter 150 such as a finger can be eliminated to avoid the damage, and the safety of the ophthalmologic apparatus can be improved.
By the operation of the timer 144, the X-direction motor 131d may be stopped after a predetermined time has elapsed.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. FIG.
4 and 15, the first embodiment shown in FIGS.
The same reference numerals are given to the same elements as those in the above configuration.

The basic configuration of the ophthalmologic apparatus according to the third embodiment shown in FIGS. 14 and 15 is the same as that of the first embodiment, but is replaced with an optical system driving section 130 as shown in FIG. As the optical system driving unit 130A, the driven gear 136 and the screw body 135 are used as friction clutches 13 which constitute a clutch mechanism.
7 (the same applies to the Y-direction and Z-direction drive mechanisms). As shown in FIG. 15, the friction clutches 137 slide in correspondence with the X-direction, Y-direction and Z-direction drive mechanisms. Slip sensor (for example, heat sensor) 15 for detecting the occurrence state
The feature is that 5a to 155c are added.

According to this configuration, when a foreign substance 150 such as a finger of a subject enters the gap G between the gantry 103 and the optical system moving unit 104, the friction clutch 137 causes the frictional operation by the clutch operation. The transmission of the driving force from the X-direction motor 131a to the optical system moving unit 104 is buffered, the effect of the excessive pressing force on the foreign matter 150 such as a finger can be reduced, and the damage can be avoided. Safety can be improved. Also, the slip sensor 155a
It is of course possible to take measures such as stopping the X-direction motor 131a on the basis of the detection result of the state of occurrence of slip due to the above.

[0063]

According to the first aspect of the present invention, even if an unexpected foreign object such as a finger of the subject enters the gap between the gantry portion and the optical system moving portion, the finger or the like can be prevented. It is possible to provide an ophthalmologic apparatus capable of avoiding damage to a foreign object and improving safety.

According to the second aspect of the present invention, a special sensor is used even in a case where a foreign matter such as a finger of a subject enters the gap between the gantry and the optical system moving unit. In addition, with the configuration and operation of overcurrent detection of the DC motor, it is possible to provide an ophthalmologic apparatus capable of eliminating the pressing force against a foreign substance such as a finger, avoiding the pressing force, and improving safety.

According to the third aspect of the present invention, when a foreign substance such as a finger of a subject enters the gap between the gantry and the optical system moving unit, the optical system moves from the motor by the clutch mechanism. It is possible to provide an ophthalmologic apparatus capable of buffering the transmission of the driving force to the part and alleviating the effect of an excessive pressing force on a foreign substance such as a finger and avoiding the damage.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of an autokeratometric fractometer according to a first embodiment of the present invention.

FIG. 2 is an optical configuration diagram of the autokeratograph fractometer according to the first embodiment.

FIG. 3 is a schematic cross-sectional view showing a gantry and an optical system moving unit of the autokeratograph refractometer according to the first embodiment.

FIG. 4 is a schematic plan view showing a gantry, an optical system moving unit, and an optical system driving unit of the autokeratograph refractometer according to the first embodiment.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a block diagram showing a control system of the autokeratograph fractometer of the first embodiment.

FIG. 7 is an explanatory diagram showing a display mode of an anterior segment image and a pinhole image shifted in position according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a display mode of an anterior eye image and a pinhole image without positional displacement according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a display mode of an anterior ocular segment image, a pinhole image, and a ring-shaped target image according to the first embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a display mode of an anterior eye image, a pinhole image, and a ring-shaped target image according to the first embodiment of the present invention.

FIG. 11 is an explanatory diagram illustrating a display mode of an anterior eye image, a pinhole image, and a ring-shaped target image according to the first embodiment of the present invention.

FIG. 12 is a schematic sectional view showing a gantry and an optical system moving unit according to the second embodiment of the present invention.

FIG. 13 is a block diagram showing a control system according to Embodiment 2 of the present invention.

FIG. 14 is a schematic plan view showing a gantry, an optical system moving unit, and an optical system driving unit according to Embodiment 3 of the present invention.

FIG. 15 is a block diagram showing a control system according to Embodiment 3 of the present invention.

[Explanation of symbols]

 Reference Signs List 20 Objective lens 28 Area sensor 82 Display unit 100 Support base 101 Fixed base 102 Moving base 103 Mount 104 Optical system moving unit 111 Operating lever 112 Operation switch 123 Mount cover 124 Optical system cover 125 Contact sensor 130 Optical system driving unit 131a X direction Motor 131b Y-direction motor 131c Z-direction motor 132 Driving gear 135 Screw body 136 Driven gear 137 Friction clutch 140 Control unit 144 Timer 150 Foreign object 152a Overcurrent detection circuit

Claims (3)

[Claims] 1. A gantry section movably supported by a support base and performing coarse alignment with respect to an eye to be inspected, and movably supported in front and rear, left and right and up and down directions with a gap between the gantry section. In an ophthalmologic apparatus having an optical system moving unit, detecting means for detecting the presence of a foreign substance in a gap between the gantry unit and the optical system moving unit, and moving the optical system moving unit back and forth, left and right, and up and down respectively. An optical system driving unit that drives and performs fine alignment with respect to the eye to be inspected, and controls the driving of the optical system driving unit based on a result of detection of a foreign substance by the detection unit. An ophthalmologic apparatus, comprising: a control unit configured to change a gap interval so as not to press the foreign matter. 2. A gantry portion movably supported by a support base and performing rough alignment with respect to an eye to be inspected, and movably supported in front and rear, left and right, and up and down directions with a gap between the gantry portion. An ophthalmologic apparatus having an optical system moving unit, an optical system driving unit using a DC motor that drives the optical system moving unit in front and rear, left and right, and up and down directions to perform fine alignment with respect to the eye to be inspected; Overcurrent detection means for detecting an overcurrent to the DC motor flowing in accordance with the intrusion of foreign matter into the gap between the unit and the optical system moving unit; and based on an overcurrent detection result by the overcurrent detection means. An ophthalmologic apparatus, comprising: control means for controlling the driving of the optical system driving unit and changing a gap between the gantry unit and the optical system moving unit to a state in which the foreign matter is not pressed. 3. A gantry section movably supported by a support base for performing rough alignment with the eye to be inspected, and is movably supported in front, rear, left, right, and up and down directions with a gap between the gantry section. An ophthalmologic apparatus having an optical system moving unit, wherein an optical system using a motor and a clutch mechanism that applies a driving force to the optical system moving unit in each of front and rear, left and right, and up and down directions to perform fine alignment with respect to an eye to be examined. A system drive unit, wherein transmission of driving force from the motor to the optical system moving unit is buffered by the clutch mechanism when foreign matter enters the gap between the gantry unit and the optical system moving unit. An ophthalmologic apparatus, comprising: