JPS587224A - Eye point measuring apparatus during work - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an eye point measuring device for measuring the line of sight passing point of the eye relative to the eyeglass lens when reading or doing table work while wearing eyeglasses.

In recent years, as the population has become older, presbyopic lenses, especially multifocal lenses, have become popular. If the lens has a particularly narrow near vision area, the frame must be adjusted accurately so that the line of sight of both eyes passes through the optical center of this near vision area. It is necessary to easily and accurately measure the near viewing point (eye point) on the lens before or after the lens is inserted into the frame.

For this reason, instead of measuring the pupil distance using a steel plate, which was conventionally used, we installed a circular mirror with a small circular target in the east center and a ring-shaped lighting device surrounding it on the desk. Have the examiner look directly at this target diagonally from the side, and from the opposite side observe the ring image of the illumination device projected onto the examinee's pupil through the center of this mirror, one eye at a time. A device is known that checks whether or not a mark of the optical center of the near vision area marked on a lens, the ring black light image, and the optotype match.

However, in this known device, the illumination light that illuminates the subject's eyes passes obliquely through the diffuser plate of the illumination device.
The illumination efficiency is poor, and the illumination light illuminates the examiner's eye as well as the patient's eye, so this illumination light enters the examiner's eye, interfering with the eye examination and making accurate measurements difficult. There was a drawback.

A first object of the present invention is to solve the above-mentioned drawbacks of the prior art, to eliminate waste in illumination, and to eliminate unnecessary illumination light from the examiner's side, thereby facilitating accurate measurements. .

In this type of measuring device, the examinee and examiner face each other through a mirror, so the examiner's pupil of the examiner as seen in the mirror is determined by the distance between the examiner's eyes and the mirror. The distance is approximately twice as far, and the pupil appears small, which hinders accurate measurement.

For this reason, it is desirable to enlarge the pupil image, but in conventional devices, even if the mirror is a concave mirror, the image is distorted, making it unusable.

A second object of the present invention is to eliminate the above-mentioned drawbacks of the conventional apparatus, and to provide a measuring device which enables magnified observation of a pupil image of a subject and which can accurately and easily measure eye points.

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings.

1 and 2 show an embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a plan view thereof.

A small circular optotype 2 is provided in the center of the circular transparent plate 1, and an annular illumination device consisting of an annular diffuser plate 5, a reflector 4, and a fluorescent lamp 5 is mounted on the case 6, with this optotype 2 as the center. It is provided on the back side of the direct transparent plate 1 that covers the circular opening provided in the plate 7. A plane mirror 9 is fixed to the inner bottom of the lower plate 8 of the case 6. The upper plate 7 and the lower plate 8 can be opened and closed by hinges 10, and the upper plate has a link mechanism so that the transparent plate 1 can be held at an arbitrary angle of inclination with respect to the mirror 9 (see Fig. 4). A support fitting 11 is provided on the outside of the case 6. Reference numeral 12 is a latch for preventing the top plate from opening.

FIG. 5 shows another embodiment in which a lens 1a having a convergence effect is provided in the center of the transparent plate 1 of FIG. 1, and an optotype 2 is provided at the apex of this lens.

In this case, the lens 1a is used as a magnifying glass for the examiner, and its focal lengths range from 30,511 to 50 countries. Further, when the transparent plate is made of hard plastic, the lens and the annular diffuser plate may be formed integrally.

FIG. 4 is an explanatory diagram showing the usage state of the device of this embodiment.

As shown in the figure, a subject 21 and an examiner 22 face each other with a case 6 placed on a table in between, and the subject is in the posture of reading or other normal table work, with the transparent plate 1 facing directly. The plate 7 is tilted. At this time, the upper plate 7 is supported at an arbitrary inclination angle by the frictional force of the support fitting 11. Under such conditions, when the examinee looks directly at the optotype 2 with both eyes through the glasses 25, a reduced image of the annular diffuser plate 3 is seen at the examinee's pupil position from the examiner 22 side. Can be seen. In conventional devices, the annular diffuser plate is not directly facing the examinee's eyes (perpendicular to the visual axis), so the image of the annular diffuser plate reflected at the examinee's pupil position is elliptical toward the examiner. However, in the apparatus of this embodiment, a clear circular image can be observed through the reflecting mirror 9. Therefore, for each eye of the subject, the examiner makes the annular diffuser image at the pupil position overlap with optotype 2,
At this time, it is checked whether the optical center point of the near lens, which has been marked in advance on the eyeglass lens, is also located at the center of the ring of the diffuser plate image, and if it is far away, its eccentricity is measured. It is possible to perform such an examination on both eyes to accurately examine the positional relationship between the optical center of each lens for near vision and the line of sight passage point during near vision.In this case, the corneal apex at the pupil position can be accurately examined. Since the radius of curvature is small, the diffuser image reflected by the cornea is also extremely small.Therefore, in order to perform the above-mentioned test accurately, the diffuser image on the subject's eye and the optical center of the spectacle lens must be magnified. It is desirable to be able to observe the subject's pupil through a lens provided at the center of the transparent plate. Since it is desirable to place the subject's pupil position,
It may be configured to replace lenses with different focal lengths depending on the working distance.

As described above, according to the present invention, since the annular diffuser of the annular illumination device directly faces the examinee's eyes, the examination can be performed in the same state as the actual Near Eastern state such as reading, and the illumination efficiency is high. Since the bright circular zone reflected at the pupil position of the subject's eye can be observed, lens adjustment work to align the optical center of the near lens of the glasses with the line of sight can be easily and accurately performed. The illumination device has a reflector that efficiently reflects the illumination light toward the subject, but blocks the light toward the examiner 2, so the examiner can take measurements without being hindered by the illumination light. can. Furthermore, when the device of the present invention is not in use, the upper and lower plates can be rotated to parallel positions and stored compactly, making it convenient to carry and preventing dust from adhering to the surface of the mirror. It can also be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the invention, FIG. 2 is a plan view thereof, and FIG. 3 is a partial sectional view of another embodiment of the invention. FIG. 4 is an explanatory diagram showing the usage state of the apparatus according to the embodiment of the present invention. [Explanation of symbols of main parts] 1...Transparent member, 1m...Lens, 2...
...Visual targets 5-5...Annular illumination device, 6
...Case, 7...Top plate, 8...
...lower board? ...Plane mirror applicant Takashi Watanabe, agent of Nippon Kogaku Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] (1) A lower plate that supports a plane mirror, and an upper plate that has an opening and is pivotally supported at one end of the lower plate so as to be able to support the plane mirror in an inclined manner; The opening is covered with a transparent member having an optotype, and an annular illumination device centered on the optotype is provided on the upper plate to supply illumination light in a direction opposite to the lower plate. An eye point measuring device for close work. (2. In the measuring device according to claim 1,
The transparent member (1) has a converging lens (
1a), and the optotype (2) is provided at the apex thereof. (5) In the measuring device according to claim 1,
The upper plate C force and the lower plate (8) are formed into a rectangular case, and the annular illumination device (5-5) and the plane mirror (9) are built into the case. Eye point measuring device from the Near East. (4) In the measuring device according to claim 1,
The annular illumination device includes at least a diffuser plate (5), a reflection plate (4), and a fluorescent lamp (5) formed in an annular shape, and is configured so that the plane mirror (9) is not directly irradiated. Nearby characterized by being there! Time eye point measuring device.