JPH11309115A - Optometer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform optometry while ensuring positioning by use of an optometer device which automatically starts the optometry according to the detection of the position of the eye to be examined. SOLUTION: When the forehead of a subject abuts against forehead support 3, this abutting is detected by a microswitch and a light beam from an illuminating light source 14 illuminates the anterior part of the eye E to be examined. The light beam reflected from the anterior part forms an image on an image pickup means 13, and the image is displayed on a television monitor 5. When the analysis of its signal leads to the recognition of the pupil P of the eye to be examined E, positioning drive is started by a drive means 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometric apparatus such as an auto-refractometer and a fundus camera used in an ophthalmic hospital.

[0002]

2. Description of the Related Art Conventionally, there is known an optometry apparatus which detects a position of an eye to be inspected, performs positioning driving, and automatically starts measurement when a predetermined position is reached. An eye refractometer that detects and automatically starts diopter guidance has been proposed.

[0003]

However, in the above-described conventional optometry apparatus which automatically performs positioning and performs optometry, the problem is that reliable positioning cannot be performed when the eye to be examined is not stable. There is a point.

An object of the present invention is to solve the above-mentioned problems and to provide an optometry apparatus capable of performing optometry with reliable positioning.

[0005]

According to the present invention, there is provided an optometry apparatus for projecting a light beam to an eye to be inspected and photoelectrically detecting a reflected light thereof to perform an optometry, and a position of the eye to be inspected. Eye position detecting means for detecting the eye position, positioning driving means for driving the optometric means based on the detection of the eye position detecting means, an abutting member for abutting the face of the eye to be inspected, and Contact detection means for detecting whether or not the object is in contact with the object, and starts driving of the positioning drive means based on contact detection by the contact detection means and eye detection by the eye position detection means. It is characterized by doing.

Further, the optometry apparatus according to the present invention, in an optometry apparatus which automatically starts an optometry based on detection of the position of an eye to be examined, can change a condition for automatically driving alignment or a condition for starting an optometry. It is characterized by having done.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows a configuration diagram of an auto-refractometer according to an embodiment. An optometry opening 2 is provided on the subject side of a housing 1, and a forehead rest 3 is fixed above the optometry opening 2. A micro switch 4 for detecting contact of the subject's forehead is attached. On the upper surface of the housing 1, a television monitor 5 as a display means and a button 6 for changing alignment and measurement start conditions are arranged. Inside the housing 1, a measuring optical system 7 and a measuring optical system 7 are driven. Driving means 8 is arranged.

In the measuring optical system 7, a cover glass 9 and a light splitting member 1 are placed on an optical path O 1 passing substantially in the center of the optometry opening 2.
0, 11, a lens 12, and an imaging means 13 are sequentially arranged, and illumination light sources 14 are arranged on both sides of an optical path O1 near the cover glass 9. A refracting power measuring means 15 is disposed in the reflection direction of the light splitting member 10, and a lens 16, a mirror 17, a lens 18, and a target 19 are sequentially arranged on an optical path O 2 in the incident direction of the light splitting member 11. I have. The refractive power measuring means 15 includes a lens 20, a mirror 21, and a perforated mirror 2.
2. A measurement light source 23 is arranged, and a six-hole stop 24, a separation prism 25, and a measurement sensor 26 are arranged in the reflection direction of the perforated mirror 22.

In such a configuration, the subject applies an forehead to the forehead rest 3 and is instructed to look at the target 19 from the subject opening 2. When the forehead is not in contact, the forehead 3 is displayed on the computer graphics screen 5a of the television monitor 5.
Is flashed and displayed, and when the forehead hits the forehead 3, the contact is detected by the microswitch 4, and the display of the figure 3 'does not flash but hits the forehead.

The illumination light source 14 illuminates the anterior segment of the subject's eye E, the reflected light from the anterior segment forms an image on the image pickup means 13, and the image is displayed on the television monitor 5. In this state, when the signal of the imaging unit 13 is analyzed and the pupil P of the eye E is recognized, the driving unit 8 starts alignment driving.
If the forehead is in contact, the position of the eye E does not move significantly during driving, so that the position can be adjusted within the driving range of the driving means 8. The anterior ocular segment image E ′ of the imaging unit 13 is sequentially captured by a calculation unit (not shown), and is analyzed to detect the position of the eye E to be inspected. The alignment is detected from the position of the pupil P on the screen, and the pupil edge is detected. The distance is detected from the degree of blur.

FIG. 2A shows an anterior segment image of the imaging means 13, FIG. 2B shows a signal on a horizontal line M in FIG. 2A, and FIG. Is represented. In order to detect the approximate pupil position on a blurred screen, the signal of the pupil part has a predetermined level.
Since the image looks darker than S1, a low portion where the signal level of the area of 2 to 8 mm in diameter is equal to or less than the predetermined level S1 is recognized as the pupil P, and the driving means 8 is driven so that the center position thereof is on the optical path O1.

On the other hand, the corneal reflected light 14 'of the illumination light source 14
Has a remarkably high luminance, so that the signal above the predetermined level S2 is ignored in the pupil detection. That is, the signal level is the predetermined level S2
By using only lower signals, corneal reflected light 1
The pupil P can be detected without being affected by 4 '.
Also, when measuring with spectacles on, specular reflection light is generated by the spectacles, but this reflected signal is also extremely strong compared to the light reflected from the anterior segment, and can be ignored. Of the pupil can be detected.

When positioning in the distance direction, the eyelid T
In order to avoid the influence of the pupil P, the driving means 8 is moved so as to obtain a focus at the lower edge position of the pupil P, and when the pupil edge is recognized, the pupil P is assumed to be a circle and the center of the pupil is calculated. At the same time, the pupil diameter is calculated. Then, alignment driving is performed by the driving unit 8 so that the optical path O1 reaches the position, and when the position is matched, the position of the eyelid T and the pupil diameter are detected.

The position of the eyelid T is calculated from the signal of the vertical line N. If the measurement light beam is blocked while the eyelid T is lowered, a warning is displayed on the television monitor 5. On the other hand, when the eyelid T is not lowered, the measurement light source 23 emits light to execute measurement. If the pupil diameter is too small to be measured, the fact is displayed on the television monitor 5, and if the pupil diameter changes, the measurement is performed when the pupil diameter is large.

The eyelid T is 5 to 8 mm ahead of the pupil P,
When the pupil P is focused, the eyelid T is blurred, so that the eyelid T is recognized at that position, and if the upper edge on the vertical line N is the same as the lower edge, the pupil edge is used instead of the eyelid T. Is recognized. When the pupil diameter is large enough to be measured, alignment is performed at the center of the pupil, and measurement is performed. When the pupil diameter is slightly insufficient, at least the upper, lower, left, and right pupil edges are recognized, and the measurement light flux is measured. Alignment is performed so that light is not shielded. Thus, the deformed pupil P
In this case, it is possible to accurately measure the optometry.

When measuring an infant or the like, it is difficult to make the forehead 3 abut at the time of measurement. In this case, a button 6 for changing the alignment or the measurement start condition is pressed. When the button 6 is pressed, the pupil P is recognized by the imaging means 13, and positioning driving is started regardless of the contact of the forehead 3. When the position of the eye is significantly changed, a warning display is displayed on the television monitor 5, and when tracking is difficult thereafter, the alignment condition for starting the measurement is changed, and the condition is gradually relaxed until the measurement can be performed. .

In this case, the calculation of the pupil recognition is omitted and the alignment driving is performed by obtaining the positioning signal in a fast cycle of, for example, 15 to 30 Hz. When the position is adjusted to a certain extent, the measurement is performed. When the refraction value of one meridian is obtained, the diopter of the target 19 is adjusted by moving the lens 18 accordingly. If the fundus reflection light beam of the measurement light source 23 received by the measurement sensor 26 is normal, it is assumed that alignment has been performed, and the measured value is displayed and recorded.

As described above, by changing the alignment or the condition for starting the measurement, it is possible to automatically perform the optometry even on a subject such as an infant whose eyes are not stable.

Instead of providing the button 6 and changing the alignment and measurement start conditions, the conditions may be changed with time. That is, when the display in which the forehead rest 3 is not touched is turned back or displayed for a predetermined time or more, this condition is excluded from the alignment start condition, and the alignment drive is performed based on the detection of the eye E to be inspected. To start. If the position of the subject's eye moves and the positioning cannot be performed for a predetermined time or more, the positioning or eyelid T
The measurement start condition is relaxed, the calculation of recognition of the pupil P and the eyelid T is omitted, and a positioning signal is obtained in a fast cycle to perform positioning driving.

In the above description, an auto-refractometer is taken as an example. However, a fundus camera can similarly recognize a pupil P and automatically perform optometric measurement and photographing.

[0021]

As described above, the optometry apparatus according to the present invention detects the abutment of the face of the subject and the position of the eye to be examined, and starts the positioning drive. It is possible to automatically and surely perform the alignment.

Further, the optometry apparatus according to the present invention can automatically change the condition for driving the alignment or the condition for starting the optometry, so that the optometry can be automatically performed irrespective of an unstable eye or a pupil shape. Optometry can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optometry apparatus.

FIG. 2 is an explanatory diagram of a video and a signal level of an imaging unit.

[Explanation of symbols]

 Reference Signs List 1 housing 2 optometry opening 3 forehead 5 TV monitor 7 measuring optical system 8 driving means 9 cover glass 13 imaging means 14 illumination light source 15 refractive power measurement means 19 optotype 23 measurement light source 26 measurement sensor

Claims (4)

[Claims] 1. An eye examination means for projecting a light beam onto an eye to be examined and photoelectrically detecting a reflected light thereof to perform an eye examination, an eye position detection means for detecting a position of the eye to be examined, and an eye position detection means for detecting the eye position detection means. Positioning drive means for driving the optometric means based on the contact member for contacting the face of the subject's eye, and contact detection means for detecting whether the contact member is in contact with the face, An optometric apparatus, wherein driving of the positioning drive unit is started based on contact detection by the contact detection unit and eye detection by the eye position detection unit. 2. The optometry apparatus according to claim 1, wherein an operation for starting driving of the positioning drive unit can be selected even when the contact is not detected by the contact detection unit. 3. An optometry apparatus for automatically starting an optometry based on a position detection of an eye to be examined, wherein an optometry apparatus for automatically driving a position or a condition for starting an optometry can be changed. . 4. The optometry apparatus according to claim 3, wherein an automatic optometry start condition based on the position detection is variable.