JPH0435638A - Ophthalmologic measuring device - Google Patents

Abstract

PURPOSE:To shorten the time required for measuring the refracting power of a tested eye and a tested lens by measuring the refracting force of a tested eye from the reflected light flux from the eyeground and measuring the refracting force of a tested lens positioned a little to the tested person side in the direction of an optical axis from the position of the tested eye. CONSTITUTION:An index for a tested eye is projected on a tested eye E, and its reflected light flux from the eyeground Er is received on a light position detecting sensor to measure the refracting power of the tested eye E from the output of the light position detecting sensor. An index for a lens is projected on a tested lens G positioned a little to the tested person side in the direction of an optical axis from the tested eye position, and its transmitted refracted light flux is received on the light position detecting sensor through light dividers 6, 11 comprising a dichroic mirror and so on to measure the refracting power of the tested lens G from the output of the light position detecting sensor. Thus, the refracting power measurement for the tested eye E and the tested lens G can be conducted with good operability so as to shorten the measuring time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ophthalmological measuring device that is used, for example, in an ophthalmological clinic and is capable of measuring the refractive power of a test lens such as a spectacle lens or a contact lens. It is something.

[Prior Art] Conventionally, during an ophthalmological examination, the refractive power of the subject's eye is objectively measured using, for example, an autorefractometer. The meter also measures the refractive power at the apex of the lens to determine whether the lens is suitable for the eye being examined.

[Problems to be Solved by the Invention] However, in the conventional example described above, separate devices are used to measure the refractive power of the eye to be examined and the lens to be worn, so it is necessary to prepare both measuring devices. The cost is high, the space required for measurement is large, and the measurement also takes a long time. Incidentally, Japanese Patent Application Laid-Open No. 63-53433 is known as a device that eliminates this drawback.

An object of the present invention is to provide an improved ophthalmological measuring device that can measure the refractive power of an eye to be examined and a worn lens with good operability with a simple configuration.

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the ophthalmological measurement device according to the present invention, an index for the eye to be examined is projected onto the eye to be examined, and the fundus reflected light is transmitted through a light receiving optical system. an eye refractive power measuring means that receives light onto an optical position detection sensor and determines an eye refractive power value from the output of the optical position detection sensor, and measures the apex refractive power of the lens to be examined separately from the eye index to be examined. A lens index and a projection optical system are used to split the light beam that is transmitted and refracted through the lens to be examined, which is located closer to the examiner in the optical axis direction than the position of the eye to be examined. and test lens refractive power measuring means for measuring the refractive power of the test lens from the output thereof by guiding the light into the light receiving optical path of the eye refractive power measuring means through a device and receiving the light with the optical position detection sensor. It is characterized by this.

[Operation] The ophthalmological measurement device having the above-mentioned configuration projects an eye index onto the eye to be examined, receives the light flux reflected by the fundus on the optical position detection sensor, and detects the output from the optical position detection sensor. The refractive power of the subject's eye is measured, and a lens index is projected onto the subject lens located on the examiner's side in the optical axis direction from the subject's eye position, and the transmitted and refracted light flux is sent to the optical position detection sensor via a light splitter. The refractive power of the lens to be tested is measured from the output of the optical position detection sensor.

[Example] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a configuration diagram according to the first embodiment, in which a light source l for measuring the eye to be examined which also serves as a measurement index is provided for measuring the refractive power of the eye E to be examined, and a light source 1 for measuring the eye to be examined is provided. On the optical path O1 leading to the optometry E, there is a lens 2. As shown in FIG. 2, a projection diaphragm 3 having an aperture 3a, a perforated mirror 4, a lens 5, a dichroic mirror 6, and a removable light shielding plate 7 are arranged in sequence. As shown in FIG. 3, there are six apertures 8a to 8f on the optical path 02.
a measuring aperture 8, a lens 9, 6 as shown in FIG.
A separating prism 10 constituted by wedge prisms 10a to 10f, a dichroic mirror 11, and an image sensor 12 are arranged, and the output of the image sensor 12 is connected to a television monitor 13. The light source 1 for measuring the eye to be examined is located at a position approximately conjugate to the fundus Er of the eye E to be examined, the projection diaphragm 3 and the measurement diaphragm 8 are located at a position conjugate to the pupil Ei, and the perforated mirror 4 is located at a position approximately conjugate to the pupil Ei. are placed in each.

In addition, a lens measurement light source 14 that also serves as a measurement index is provided to measure the refractive power of a test lens G such as glasses worn by the test eye E, and this measurement light source 14 leads to the dichroic mirror 6. On the optical path 03, a lens 15,
A contact member 16 that abuts the test lens G, and a reflection mirror 17
is located.

Further, a single or plural illumination light source 18 is provided facing the eye E to observe the anterior segment of the eye E, and is placed on an optical path 04 that passes straight through the dichroic mirror 6 from the eye E to be examined. A reflecting mirror 19, a lens 20, and a removable light shielding plate 21 are arranged.

In addition, the wavelength ranges of the light beams emitted from the eye measurement light source 1, the lens measurement light source 14, and the illumination light source 18 are different, and the dichroic mirror 6 has different wavelength ranges. The dichroic mirror 11 has a spectral characteristic of transmitting a light beam, for example, a visible light beam having a different wavelength range, and reflecting a light beam, for example, a near-infrared light beam, emitted from the light source l for measuring the eye to be examined. It has a spectral characteristic of transmitting the light flux emitted from the light source 14 for lens measurement and reflecting the light flux emitted from the illumination light source 18.

When measuring the refractive power of the eye E, the illumination light source 18 is turned on to illuminate the anterior segment of the eye while the light shielding plate 7 is retracted from the optical path O1 and the light shielding plate 21 is retracted from the optical path o4. . The light beam reflected by the anterior segment of the eye E to be examined passes through the dichroic mirror 6, and after being reflected by the reflection mirror 19,
It is reflected by the dichroic mirror 11 through the lens 20 and formed on the image sensor 12 as an anterior eye segment image M, and this anterior eye segment image M is displayed on the television monitor 13 as shown in FIG.

The examiner observes this anterior segment image M to align the eye E to be examined, and after completing the alignment, turns off the illumination light source 18 and turns on the light source 1 for measuring the eye to be examined. The light beam from the light source 1 for measuring the eye to be examined travels along the optical path above the eye, and passes through the lens 2 and the projection diaphragm 3.
, through the hole of the perforated mirror 4 and the lens 5, and is reflected by the dichroic mirror 6 to reach the eye E to be examined, and the fundus E.
The reflected light beam from r returns along the same optical path, is reflected by the perforated mirror 4, travels on the optical path 02, passes through the measurement aperture 8 and lens 9, is separated from the optical path by the separation prism 10, and then passes through the dichroic mirror 11. image sensor 12
As shown in FIG. 6, six reflected light flux images P are projected onto the image, and the refractive power of the eye E is calculated from the positional relationship of these reflected light flux images P.

When measuring the refractive power of the test lens G, the test lens G is fixed in contact with the contact member 16, the light shielding plate 7 is inserted on the optical path 01, and the light shielding plate 21 is inserted on the optical path 04. In this state, the lens measurement light source 14 is turned on. Lens measurement light source 14
The light beam emitted from the is passed on the optical path 03, is made into a parallel light beam by the lens 15, enters the test lens G, is reflected by the reflection mirror 17, and passes through the dichroic mirror 6, then proceeds on the optical path 01, and passes through the lens 5. After that, it is reflected by the perforated mirror 4, and further passes through the measurement diaphragm 8, lens 9, separation prism 1O, and dichroic mirror 11, and then appears on the image sensor 12 as six transmitted light flux images P in the same way as when measuring the eye E.
The refractive power and prism degree of the lens G to be tested are calculated from the positional relationship of these light flux images P°. Alignment to match the optical axis of the lens G to be tested with the optical path 03 can be performed using the positions of these reflected beam images P° (for example, by placing a radial mark on the television monitor 13 as shown in FIG. 7). Q is electrically generated, a reflected light flux image P° is output to the television monitor 13, and the center of the reflected light flux image P° is aligned with the center of this mark Q, thereby aligning the lens G to be tested. It is easy if you do this.

The purpose of using the light shielding plate 7.21 during measurement is to prevent the light flux from, for example, an illumination lamp in the room from being reflected by the cornea of the eye E and being received by the image carrier 12, and to improve accuracy. This is to perform refraction value measurement.

Furthermore, in the second embodiment shown in FIG. 8, the reflection mirror 17 is removed from the optical path o3, and the light beams from the lens measurement light source 14, lens 15, etc. are arranged so as to directly enter the dichroic mirror 6. ing.

FIG. 9 is a configuration diagram according to the third embodiment, in which a lens 2, a projection diaphragm 3, a perforated mirror 4, and a lens inserted into the optical path 05 are arranged on the optical path 05 from the light source 1 for measuring the eye to be examined to the eye E to be examined. A removable reflective mirror 22, a dichroic mirror 23, a lens 5, and a light shielding plate 7 that can be inserted into and removed from the optical path 05 are arranged in sequence.
Optical path 0 from the lens measurement light source 14 to the reflection mirror 22
6, a lens 15, an abutting member 16, a reflecting mirror 17
, lenses 24 are arranged. In addition, the perforated mirror 4
A measurement aperture 8, a lens 9, a separation prism 10, a dichroic mirror 25, and an image sensor 12 are arranged on the optical path o7 in the direction of reflection, and the output of the image sensor 12 is displayed on the TV monitor 1.
Connected to 3. Furthermore, for observation of the anterior segment of the eye E, an illumination light source 18 is arranged to face the eye E, and a reflective mirror 19 is arranged in the direction of reflection of the dichroic mirror 23. A lens 20, a light shielding plate 21 that can be inserted into and removed from the optical path, and a dichroic mirror 25 are arranged. Note that the reflection mirror 22 is inserted into the optical path 05 or is used in a retracted state.

When measuring the refractive power of the eye E to be examined, the reflecting mirror 22 is set to the optical path 0.
5 and turns on the illumination light source 18 for anterior ocular segment observation to illuminate the anterior ocular segment. The light beam reflected by the anterior segment of the eye is reflected by the dichroic mirror 23 and the reflection mirror 19,
It is further reflected by the dichroic mirror 25 via the lens 20 and projected onto the image sensor 12 as an anterior segment image M.
This anterior segment image M is output to the television monitor 13, and the examiner observes it and performs alignment.

When the illumination light source 18 is turned off and the test eye measurement light #j1 is turned on after the alignment is completed, the light beam emitted from the test eye measurement light source 1 travels on the optical path 05, and passes through the lens 2, the projection diaphragm 3, and the perforated mirror. 4 hole, dichroic mirror 2
3. The light flux reaches the eye E through the lens 5, and is reflected by the fundus Er, returns along the same optical path, is reflected by the perforated mirror 4, and passes through the measurement aperture 8, lens 9, separation prism 10. The reflected light flux image P is projected onto the image sensor 12 via the dichroic mirror 25.

When measuring the refractive power of the lens G to be tested, the reflecting mirror 22 is placed on the optical path 05 and the light source 14 for lens measurement is turned on.The light beam from the light source 14 for lens measurement is directed to the lens 15, the lens G to be tested, and the reflecting mirror. 17. After being reflected by the reflecting mirror 22 via the lens 24 and further reflected by the perforated mirror 4, the measurement aperture 8. The reflected light flux image P° is formed on the image sensor 12 via the lens 9, the separation prism 10, and the dichroic mirror 25. Note that the role of the light shielding plate 7.21 in the second and third embodiments is the same as that in the first embodiment.

FIG. 10 is a configuration diagram according to the fourth embodiment, in which the optical path 0
Two relay lenses 26 and 27 are arranged between the abutting member 16 on the third embodiment and the reflecting mirror 17, and the other configurations are the same as in the first embodiment. When measuring the refractive power of the lens G to be tested, by changing the focal length of the relay lenses 26 and 27, the lens G to be tested can be set at any position along the optical path 03. 14, lens 15, and contact member 16 can be moved to a position with good operability.

In the embodiments described above, the common image sensor 12 is used as the optical position detection sensor for measuring the eye E and the lens G, but different sensors may be used.

(Effects of the Invention) As explained above, the ophthalmological measuring device according to the present invention projects an eye index onto the eye to be examined, receives the light flux reflected by the fundus on the optical position detection sensor, and receives the reflected light beam on the optical position detection sensor. The refractive power of the subject's eye is measured from the output of the position detection sensor, and an index for the subject lens is projected onto the subject lens located closer to the examiner in the optical axis direction than the position of the subject's eye, and the refracted and transmitted light flux is measured. The light is received on the optical position detection sensor via the light splitter, and the refractive power of the test lens can be measured from the output of the optical position detection sensor. The refractive power of lenses can be measured alternately or simultaneously to shorten the measurement time.

[Brief explanation of the drawing]

The drawings show an embodiment of the ophthalmological measurement device according to the present invention, in which Fig. 1 is a configuration diagram, Fig. 2 is a front view of a projection diaphragm, Fig. 3 is a front view of a 6-hole measurement diaphragm, and Fig. 4 is an isolated diagram. front view of prism,
FIG. 5 is an explanatory diagram of the anterior segment image on the television monitor, FIG. 6 is an explanatory diagram of the reflected luminous flux image on the image sensor, FIG. 7 is an explanatory diagram of the reflected luminous flux image on the television monitor, and FIG. FIG. 9 and FIG. 1O are configuration diagrams of other embodiments, respectively. Code 1.14.18 is a light source, 2.5.9.15.20.
24 is a lens, 3 is a projection diaphragm, and 4 is a perforated mirror 6.
11, 23, and 25 are dichroic mirrors, 7.21 is a light shielding plate, 8 is a measurement aperture, 1O is a separating prism, 12 is an image pickup device, 13 is a television monitor, 17.19 is a reflecting mirror, and 27 is a relay lens.

Claims (1)

[Claims] 1. Project an eye index onto the eye to be examined, receive the reflected light from the fundus on a light position detection sensor via a light receiving optical system, and determine the eye refractive power from the output of the light position detection sensor. An eye refractive power measuring means for determining a value, an eye lens index and projection optical system for measuring the apex refractive power of a lens to be examined separately from the eye index to be examined, and an index projection light for the lens to be examined. is transmitted and refracted through the lens to be examined, which is located closer to the examiner in the optical axis direction than the position of the eye to be examined, and guides it into the light receiving optical path of the eye refractive power measuring means through a light splitter and is received by the optical position detection sensor. and a test lens refractive power measuring means for measuring the refractive power of the test lens from the output thereof. 2. The ophthalmological measuring device according to claim 1, wherein the light splitter is a dichroic mirror. 3. The ophthalmological measuring device according to claim 1, further comprising a light shielding plate provided in the optical path of the eye refractive power measuring means for preventing the eye index from being projected onto the lens to be examined. 4. The ophthalmological measuring device according to claim 1, wherein an alignment signal is electrically generated on the optical position detection sensor.