JP2001187020A - Self-conscious type optometry apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an inspection on visual functions being accurate and safe to a subject to be inspected. SOLUTION: Six pieces of LEDs 15p and 16p as light emitting devices are spaced in a torus-like shape at equiangular intervals around optometry windows 13 and 14 to which the eyes to be inspected of the subject to be inspected are faced, and these LEDs 15p and 16p are covered with transparent torus-like covering members 15q and 16q made of an acrylic resin. In addition, on scattering sites 151s and 161s facing to the top parts of the LEDs 15p and 16p on the inner walls of channel parts 151r and 161r, fine cut processings for irregularly reflecting the light emitted from the LEDs 15p and 16p are applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subjective optometry apparatus having an optometry unit in which a light source for illuminating an anterior segment of an eye to be examined is arranged around an optometry window.

[0002]

2. Description of the Related Art Conventionally, when performing a visual function test using a subjective optometry apparatus, it is first checked whether or not the eye to be examined is correctly opposed to an optometry unit. That is, the anterior segment of the subject's eye is illuminated, and the examiner observes and adjusts whether the distance between the apex of the cornea and the optometry window (viewing window) of the optometry unit is appropriate.

For this reason, as shown in FIGS. 17 to 19, at least six LEDs 103 are annularly arranged around the optometry window 102 of the optometry unit 101 on the subject side.
Are fixed to the groove of the annular metal member 104, are arranged at equal angular intervals around the axis of the optometry window 102, and face toward the anterior segment of the subject at the time of observation, in order to uniformly illuminate the subject. The examiner adjusts the apparatus so that the distance becomes an appropriate value while observing the vicinity of the corneal apex from the lateral direction.

[0004]

However, the above L
The ED 103 is exposed, and the subject
Since it receives sharp illumination light directly from the camera, there is a problem in that the user may feel discomfort or fear due to dazzling.

Further, attention is paid to the LED 103 of the near light source, and it is easy to focus on the LED 103. Therefore, when performing a visual function test while viewing a target of a target presenting apparatus that is relatively far away, a so-called so-called LED is used. There is a problem that the influence of “mechanical myopia” becomes strong and hinders an accurate visual function test.

Further, since the shape of the portion where the LED 103 is mounted becomes complicated, there is a problem that it is difficult to completely clean the details even though dust and the like are easily accumulated.

Accordingly, the present invention has been made in view of the above circumstances, and provides a subjective optometric apparatus which allows a subject to easily and accurately undergo a visual function test with ease and easy cleaning. With the goal.

[0008]

According to an aspect of the present invention, there is provided a light source for illuminating an anterior eye of an eye to be examined around an optometry window through which an examinee looks. Wherein the light source is covered with a light-transmitting covering member that transmits light emitted from the light source.

[0009] Thus, since the light source is covered with the light transmitting covering member, the light emitted from the light source is slightly blurred due to scattering and becomes illumination light having a soft impression, so that discomfort and fear are alleviated. The person can take a visual function test in a comfortable and comfortable state.

Therefore, attention to the light source is distracted,
The effect of mechanical myopia is reduced, and a visual function test can be accurately performed.

Further, since the light source is covered with the covering member, the cleaning is easy and the feeling of cleanliness can be enhanced.

Further, since light is emitted, for example, by multiple reflection from portions other than the portion where the light source is disposed, uniform illumination can be achieved with a small number of light sources.

According to a second aspect of the present invention, there is provided a subjective optometry apparatus according to the first aspect, wherein the light source comprises a plurality of light-emitting elements formed in a ring along the periphery of the optometry window. It is characterized by being arranged in.

Thus, the light emitted from the plurality of light emitting elements is slightly blurred due to the scattering and becomes illumination light having a ring-shaped soft impression, so that discomfort and fear are alleviated, and the subject can perform the visual function test with confidence. Can receive.

According to a third aspect of the present invention, there is provided a subjective optometry apparatus according to the first or second aspect, wherein the covering member diffusely reflects light emitted from the light source. It is characterized by having a diffusion surface.

Thus, the light emitted from the light source is diffusely reflected on the diffusion surface of the covering member and reaches the subject's eye, so that the illumination light has a softer impression, and the feeling of discomfort and fear is alleviated. You can take a functional test.

According to a fourth aspect of the present invention, there is provided a subjective optometry apparatus according to any one of the first to third aspects, wherein the covering member comprises a translucent medium. It is characterized by consisting of.

Thus, since the covering member is made of a translucent medium, the illumination light has a softer impression, the discomfort and fear are alleviated, and the subject can undergo a visual function test with confidence.

According to a fifth aspect of the present invention, there is provided a subjective optometry apparatus according to any one of the first to fourth aspects, wherein the illumination light emitted from the light source is provided. Is characterized in that the irradiation direction is changed at least once via a predetermined optical element to irradiate the eye to be examined.

Thus, the illumination light emitted from the light source changes its irradiation direction once through a predetermined optical element,
Since the light is indirectly radiated to the subject's eye, the illumination light has a softer impression, the discomfort and fear are alleviated, and the subject can undergo a visual function test with confidence.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a front view showing the configuration of a subjective optometry apparatus according to Embodiment 1 of the present invention, as viewed from the examiner side, and FIG.
FIG. 3 is a perspective view showing a use state of the subjective optometry apparatus, FIG. 3 is a cross-sectional view schematically showing a configuration of the subjective optometry apparatus, and FIG. FIG. 5 is an enlarged view showing part A of FIG.
FIG. 6 is a sectional view taken along the line BB of FIG. 5, and FIG.
FIG. 8 is a diagram showing the configuration of the optotype presenting apparatus, and FIG. 9 is a block diagram showing the electrical configuration of the subjective optometry apparatus.

As shown in FIGS. 1 to 7, the subjective optometry apparatus 1 according to the first embodiment includes a large number of keys for inputting various optometry information movably arranged on an optometry table 2. And a display unit 4 composed of a liquid crystal display or the like for displaying various types of optometry information, a column 5 extending vertically from the corner of the optometry table 2 and extending and contracting in the vertical direction. Eyes E1 and E1, which are movably supported in the vertical and horizontal directions with respect to the optometry table 2, by a lateral arm 6 rotatably mounted around the eye.
2 is provided with an optometric unit 7 for subjective optometry.

An operating arm 8 equipped with, for example, an electromagnetic lock mechanism is projected from the projecting end of the lateral arm 6. By operating the operating arm 8, the supporting arm 5 of the optometry unit 7 is operated together with the lateral arm 6. Is pivoted in the directions of arrows a and b shown in FIG. 1 with the shaft as a support shaft, so that the optometry unit 7 can be moved between the optometry position shown in FIG. 1 and a non-optometry position rotated by about 90 degrees from this optometry position.

The optometry unit 7 is configured to be separated from the right eye unit 9 for the right eye and the left eye unit 11 for the left eye, and is controlled by an adjustment mechanism 12 connected to the horizontal arm 6. 1 can be slid in the arrow direction (horizontal direction).

The right eye unit 9 of the optometry unit 7
The left eye unit 11 includes an optometry window 1 for the right eye and the left eye, respectively.
And an anterior eye observation system 15 and 16 for confirming the position of the anterior eye when the eyes E1 and E2 of the subject are opposed to the optometry windows 13 and 14, respectively. It is provided for.

The right eye unit 9 and the left eye unit 1
In front of the eye 1, for example, 5 m (examiner side), an optotype presenting unit 171 for presenting various optotypes 171a for visual function inspection of the eyes E1, E2 such as a Landolt's ring and a visual acuity value chart is provided at the front. The optotype presenting device 17 is arranged (see FIG. 8).

A forehead contact portion 18 is provided at a predetermined portion of the surface of the optometry unit 7 on the subject side for applying and fixing the subject's forehead. An illumination device 19 for illuminating the entire apparatus is attached to the upper end of the support 6.

The operation unit 3 includes an optotype setting unit for setting various optotypes such as a Landolt ring and a visual acuity chart, and the spherical power and the cylindrical power of the left and right eye optometry lenses. Various keys for setting, power on / off key, eye to be examined E1
, E2 are provided with LED operation keys for illuminating the anterior segment of the eye.

On the display unit 4, a numerical value display unit for displaying a spherical power, a cylindrical power, an axis angle, an interpupillary distance (PD), etc. on a display surface, an inspection item display, and a switching operation for the spherical power, etc. are performed. A plurality of optotypes respectively corresponding to an operation area, a function selection area for setting various functions such as setting of a prism angle, a visual acuity value chart for complete correction visual acuity measurement, a red-green chart, a cross cylinder test chart, an astigmatism test chart, etc. Are displayed in an optometry chart display field or the like for displaying the list in a list.

As shown in FIG. 3, the optometry unit 7 includes a spherical lens, a cylindrical lens, and a prism for each disc inside the right eye unit 9 for the right eye and the left eye unit 11 for the left eye. Different types like lenses, and
Disc groups 21 and 22 each composed of a plurality of disks in which lens groups having different powers are individually arranged in a circular arrangement are incorporated in a coaxial arrangement, and the plurality of disks are rotationally driven by a unit driving unit 23 described later. A predetermined frequency is synthesized by a plurality of lenses so as to face the respective optometry windows 13 and 14 of the right eye unit 9 and the left eye unit 11.

As shown in the figure, the anterior eye observation system 15 (16) is provided around the optometry window 13 (14) in which the eye E1 (E2) is opposed to the eye. An illumination unit 15a (16a) for uniformly illuminating the eye, and an optometry window 13 (1
An entrance window 15 for taking in light from the anterior segment in a direction perpendicular to the outside on the horizontal plane with respect to the axial direction of 4) (the line of sight of the subject).
b (16b), a flat mirror 15c (16c) for changing the direction of the light from the anterior segment to a substantially right angle direction, and an exit window 15d for extracting the light from the anterior segment to the front (examiner side). 1
6d).

The illuminator 15a (16a) is shown in FIGS.
As shown in the figure, for example, LEDs 15p (16p), 15 as six light-emitting elements arranged at equal angular intervals in a ring shape
, and a transparent covering member 15q (16q) made of an acrylic resin.

The covering member 15q (16q) has LE inside.
D15p (16p) to accommodate a groove 151r (1
61r), and a covering portion 151q (161q), which is an annular rotating body having a substantially U-shaped cross section, and a covering portion 151q (161q).
q), extending from the inside of the covering part 151q (161q) coaxially with the outer diameter of the opening of the optometry window 13 (14), and a short cylindrical fitting part fitted into this opening. 152q
(162q) and a disc-shaped lens cover 153q (163q) for closing the opening of the optometry window 13 (14), and the groove 151r (161r) of the covering portion 151q (161q).
LED15p (16p) is stored in the cover 151q
In the state where the opening-side end surface of (161q) is in contact with the rear surface of the optometry unit main body around the optometry window 13 (14), the fitting portion 1
52q (162q) is fitted and fixed in the opening of the optometry window 13 (14).

The covering member 15q (16q) is detachably attached to the main body of the optometry unit.

Here, the diffusion portion 1 on the inner wall of the groove 151r (161r) facing the top of the LED 15p (16p).
51s (161s) is finely cut as shown in FIG.

Next, the electrical configuration of the subjective optometry apparatus 1 will be described.

The subjective optometry apparatus 1 is, as shown in FIG.
Control unit 3 for controlling the whole according to a predetermined operation program
1, a program memory 32 storing an operation program of the control unit 31, and a storage unit 3 storing various optometry information.
3, the operation unit 3, the display unit 4, and the unit driving unit 2 for driving the disk groups 21 and 22 of the optometry unit 7.
3 and LEDs 15p and 16p.

Next, the operation of the subjective optometry apparatus 1 will be described.

First, the examinee enters the optometry window 1 of the optometry unit 7.
Both eyes E1 and E2 face 3 and 14, and the forehead is applied to the forehead abutment portion 18 to fix the head. When the forehead comes into contact with the forehead contact portion 18, the sensor is detected by a sensor (not shown), and is notified to the examiner by lighting a lamp or the like.

Next, the examiner turns on the LEDs 15p and 16p via the control unit 31 using LED operation keys (not shown) to illuminate the anterior eye parts of the eyes E1 and E2.

Here, the light emitted from the LED 15p (16p) is applied to a diffusion portion (diffusion surface) 151s (1) where the inner surface of the covering portion 151q (161q) is finely cut.
61s), and the coating 151q (161
The multiple reflections occur at both the boundary surfaces of q), and reach the eye E1 (E2).

Thus, each LED 15p (16p)
Light emitted from the LED 15
covering part 151q including a part where p (16p) is disposed
(161q) is emitted from a relatively wide area.

A part of the light from the anterior segment of the eye E1 (E2) illuminated by the LED 15p (16p) is first taken in from the entrance window 15b (16b) along the optical path Y1 (Y2) and becomes flat. Of the mirror 15c (16c), the direction of which is changed in a substantially right angle direction, and
Is taken out of front and observed by the examiner. This allows the examiner to determine whether the eyes E1 and E2 are correctly opposed to the optometry unit 7, for example, whether the distance between the cornea vertex and the opening end of the optometry window 7 is appropriate. After confirmation, the device is adjusted so that the distance becomes an appropriate value.

During this time, the subject receives illumination light having a slightly blurred ring-like soft impression, and the light source LED 15p
(16p) It is possible to receive an examination while maintaining a comfortable state without paying attention to (16p).

Thereafter, the examiner uses the operation unit 3 placed on the optometry table 2 to adjust the optical system in the optometry unit 7 in accordance with the state of the eyes E1, E2.

When the operation unit 3 is operated by the examiner, the unit driving unit 23 controls the disk group 2 under the control of the control unit 31.
The optical systems 1 and 22 are driven to switch the optical system including each lens and the filter to a predetermined optical arrangement.

The subject visually recognizes, for example, the Landolt ring 171a or the like presented on the optotype presenting unit 171 of the optotype presenting apparatus 17 in the direction along the optical paths X1 and X2 via the optical system thus set. Then, they undergo a series of visual function tests while following the instructions of the examiner.

As described above, according to the first embodiment, the LEDs 15p and 16p are formed by the light-transmitting covering members 15p.
LEDs 15p and 16p because they are covered with q and 16q
The light emitted from the light is slightly blurred due to scattering and becomes illumination light having a ring-shaped soft impression, so that discomfort and fear are alleviated, and the subject can undergo a visual function test in a relaxed state with peace of mind.

Further, the light emitted from the LEDs 15p and 16p is transmitted to the diffused portion 151 of the covering member, which has been cut.
Since the light is diffusely reflected at s and 161 s and reaches the eyes E1 and E2, the illumination light has a softer impression.

Therefore, the light source LEDs 15p, 16p
Therefore, the effect of mechanical myopia is reduced, and a visual function test can be accurately performed.

The LEDs 15p and 16p are the covering members 1
Since it is covered with 5q and 16q and is in a sealed state, dust and the like hardly accumulate, cleaning is easy, and cleanliness can be enhanced.

Further, since light is emitted, for example, by multiple reflection from portions other than the portion where the LEDs 15p and 16p are arranged, even a small number of LEDs 15p and 16p can be illuminated uniformly.

Further, since acrylic resin is used as the material of the covering members 15q and 16q, the material cost is low, and it is possible to mount the cover members 15q and 16q by a simple method such as slightly deforming and fitting by utilizing elasticity. Therefore, a fixing tool such as a screw or a supporting hardware is unnecessary. In addition, since it is detachable, it can be easily replaced. Embodiment 2 FIG. FIG. 10 is a partially cutaway perspective view showing a configuration of a main part of an illumination unit of a subjective optometry apparatus according to Embodiment 2 of the present invention, and FIG. 11 is a cross-sectional view taken along line FF of FIG. .

The second embodiment is different from the first embodiment described above.
The difference from the first embodiment is that the LED 1
A covering portion 151q (161q) covering 5p (16p);
Lens cover 153q to close the opening of the optometry window 13 (14)
While (163q) was configured using separate members, as shown in FIGS. 10 and 11, a substantially disk-shaped covering plate 41q (42q) was configured to have both functions. Is a point.

The illumination section 41a (42) of the second embodiment
a) includes, as shown in FIGS. 10 and 11, six LEDs 41p (42p) arranged at equal angular intervals in a ring shape,
The LED 41p (42p) is covered and the optometry window 13 (1
4) a transparent substantially disc-shaped covering plate 41q (42q) made of, for example, an acrylic resin for closing the opening of 4).

In the covering plate 41q (42q), as shown in the figure, the side edge portion where the LED 41p (42p) is opposed is cut into a stepped cross section, and the LED 41p (4q) is cut.
2p) Diffuse portion 4 for irregularly reflecting the illumination light emitted from
11s (412s).

According to the second embodiment, substantially the same effects as those described in the first embodiment can be obtained.

In addition, the single covering plates 41q and 42q
Since it covers the LEDs 41p and 42p to diffusely reflect the illumination light and also functions as a lens cover, the material cost can be reduced. Embodiment 3 FIG. FIG. 12 is a perspective view showing a part of a configuration of a main part of an illumination unit of the subjective optometry apparatus according to Embodiment 3 of the present invention, and FIG. 13 is a cross-sectional view taken along line GG of FIG. .

The third embodiment is different from the second embodiment described above.
The difference from the embodiment is that, as shown in FIG. 12 and FIG. 13, indirect illumination is used to temporarily change the illumination direction.

The illumination unit 51a (52) of the third embodiment
FIG. 12A is a state in which the light is emitted so as to emit light mainly in a direction parallel to a cross section with respect to the axis of the optometry window 13 (14) as shown in FIGS. Six LEDs 51p (52p) arranged and LED5
It has a transparent substantially disk-shaped covering plate 51q (52q) made of, for example, acrylic resin that changes the illumination direction emitted from 1p (52p) and closes the opening of the optometry window 13 (14).

As shown in the drawing, the covering plate 51q (52q) is formed by cutting a substantially disk-shaped member except for the surface portion to form a recess having a trapezoidal cross section.
The illumination light coming from (52p) changes its direction on the inner wall surface 511s (521s), which is the boundary surface, and changes its direction.
Injected toward (E2).

According to the third embodiment, substantially the same effects as those described in the second embodiment can be obtained.

In addition, light is emitted laterally from the LED 51p (52p), and this light is transmitted to the inner wall surface 511s (521).
In step s), the irradiation direction is changed, and the subject's eye E1 is indirectly changed.
Since (E2) is illuminated, the illumination light can have a softer impression.

Since the LEDs 51p (52p) are arranged horizontally, it is possible to contribute to space saving in the direction (depth direction) along the optical path X1 (X2). Embodiment 4 FIG. FIG. 14 is a partially cutaway perspective view showing a configuration of a main part of an illumination unit of a subjective optometry apparatus according to Embodiment 4 of the present invention, and FIG. 15 is a sectional view taken along line HH in FIG. .

The fourth embodiment is different from the first embodiment described above.
14 and 15 is that, as shown in FIGS. 14 and 15, indirect illumination is performed in which the illumination direction is temporarily changed on the surface side of the cover plate 61q (62q).

The illumination unit 61a (62) of the fourth embodiment
14A is a state in which the light is emitted so as to emit light mainly in a direction parallel to a cross section with respect to the axis of the optometry window 13 as shown in FIG. 14 and FIG. Six LEDs 61p (62p) arranged and LED 6
Changing the direction of illumination emitted from 1p (62p), for example, a hollow covering plate 61q (62q) made of glass and having a substantially trapezoidal cross section.
And the cover plate 61q (62
q) and a cover glass 61r (62r) that is bonded to the opening of the cover plate 61q (62q).

In the covering plate 61q (62q), as shown in the figure, the outer wall surface 611s (621s) has a mirror surface, and the illumination light coming from the LED 61p (62p) is directed on the outer wall surface 611s (621s). Is changed and the eye E1 is diffused by the cover glass 61r (62r).
Injected toward (E2).

According to the fourth embodiment, substantially the same effects as those described in the first embodiment can be obtained.

In addition, light is emitted laterally from the LED 61p (62p), and this light is transmitted to the outer wall surface 611s (621p).
Change the irradiation direction in s) and indirectly examine the subject's eye 1
Since (E2) is illuminated, the illumination light can have a softer impression.

Further, since the LEDs 61p (62p) are arranged horizontally, it is possible to contribute to space saving in the direction (depth direction) along the optical path X1 (X2).

Although the embodiment of the present invention has been described in detail, the specific configuration is not limited to this embodiment.

For example, a case has been described where the light source is used to check whether the distance between the corneal vertex and the optometry unit 7 is proper at the start of the visual function test. May be used for observing the state of the anterior segment of the subject's eye in accordance with.

Further, for example, in the first embodiment, the covering members 15q and 16q are made transparent. However, the covering members 15q and 16q may be made semi-transparent and the unevenness processing may be omitted. Further, the material of the covering members 15q and 16q may be a transparent resin other than the acrylic resin. Further, glass or the like may be used other than the resin. By using glass, scratches are hardly caused, and the occurrence of distortion can be suppressed.

In the covering members 15q and 16q,
The lens covers 153q and 163q may be omitted.

The number of LEDs 15p and 16p is not limited to six, but may be eight, for example.

The covering members 15q and 16q are connected to the optometry window 1
Although they are fitted into the openings 3 and 14, they may be provided with screws and screwed on, or may be provided with flanges and attached.

In the fourth embodiment, the irradiation direction is changed by reflecting the light on a mirror surface.
As shown in FIG. 6, the irradiation direction may be changed using a prism 71q.

Further, for example, in the fourth embodiment, the cover glass 61r, 62r is provided with a transparent film or a semi-transparent film which is formed by embossing the rear surface of the transparent disk-shaped member in the annular region where the LEDs 61p, 62p are opposed to each other. May be adhered using an adhesive.

Further, a simple configuration may be adopted in which the annular regions of the cover glasses 61p and 62p are subjected to unevenness processing to form a diffusion portion.

An annular groove is provided on the back side of the cover glass 61p, 62p, and the LED 61p, 62p
And at least a part of the LEDs 61p and 62
Irregularity processing may be performed on the surface on which p is opposed to form a diffusion portion.

[0081]

As described above, according to the first aspect of the present invention, since the light source is covered with the light-transmitting covering member, the light emitted from the light source is slightly blurred due to scattering and has a soft impression. Since the illumination light is used, the feeling of discomfort and fear is reduced, and the subject can undergo a visual function test in a safe and comfortable state.

Therefore, the attention to the light source is deviated.
The effect of mechanical myopia is reduced, and a visual function test can be accurately performed.

Further, since the light source is covered with the covering member, the cleaning is easy and the feeling of cleanliness can be enhanced.

Further, since light is emitted, for example, by multiple reflection from portions other than the portion where the light source is arranged, even a small number of light sources can be illuminated uniformly.

According to the second aspect of the present invention, the light emitted from the plurality of light-emitting elements is slightly blurred due to scattering and becomes illumination light having a ring-like soft impression. The examiner can take the visual function test with confidence.

According to the third aspect of the present invention, the light emitted from the light source is diffusely reflected on the diffusion surface of the covering member and reaches the subject's eye, so that the illumination light has a softer impression.
Discomfort and fear are alleviated, and the subject can undergo a visual function test with confidence.

According to the fourth aspect of the present invention, since the covering member is made of a translucent medium, the illumination light has a softer impression, the feeling of discomfort and fear is alleviated, and the subject can feel safe in the eyes. You can take a functional test.

According to the fifth aspect of the present invention, the illumination light emitted from the light source is once changed in the irradiation direction via the predetermined optical element and is indirectly irradiated to the eye to be inspected. The illumination light has a softer impression, discomfort and fear are alleviated, and the subject can undergo a visual function test with ease.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of a subjective optometry apparatus according to a first embodiment of the present invention, as viewed from an examiner.

FIG. 2 is a perspective view showing a use state of the subjective optometry apparatus.

FIG. 3 is a cross-sectional view schematically showing a configuration of the subjective optometry apparatus.

FIG. 4 is a rear view of the optometry unit constituting the subjective optometry apparatus as viewed from a subject;

FIG. 5 is an enlarged view showing part A of FIG. 4 in an enlarged manner.

FIG. 6 is a sectional view taken along the line BB of FIG. 5;

FIG. 7 is an enlarged sectional view showing a portion C of FIG. 6 in an enlarged manner.

FIG. 8 is a diagram illustrating a configuration of an optotype presenting apparatus.

FIG. 9 is a block diagram showing an electrical configuration of the subjective optometry apparatus.

FIG. 10 is a perspective view partially broken away showing a configuration of a main part of an illumination unit of the subjective optometry apparatus according to the second embodiment of the present invention.

FIG. 11 is a sectional view taken along line FF of FIG. 10;

FIG. 12 is a perspective view partially broken away showing a configuration of a main part of an illumination unit of the subjective optometry apparatus according to Embodiment 3 of the present invention.

FIG. 13 is a sectional view taken along the line GG of FIG.

FIG. 14 is a perspective view partially broken away showing a configuration of a main part of an illumination unit of a subjective optometry apparatus according to Embodiment 4 of the present invention.

FIG. 15 is a sectional view taken along the line HH in FIG. 14;

FIG. 16 is a partially cutaway view illustrating a configuration of a main part of an illumination unit of a subjective optometry apparatus according to a modified example of Embodiment 4 of the present invention.

FIG. 17 is a diagram for explaining a conventional technique.

FIG. 18 is a diagram for explaining a conventional technique.

FIG. 19 is a diagram for explaining a conventional technique.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 subjective optometry device 7 optometry unit 13, 14 optometry window 15 p, 16 p, 41 p, 42 p, 51 p, 52 p, 6
1p, 62p LED (light source, light emitting element) 15q, 16q Covering member 151q, 161q Covering part 151s, 161s Diffusion part 41q, 42q, 51q, 52q, 61q, 62q Covering plate 411s, 412s Diffusion part 71q Prism (optical element)

Claims (5)

[Claims] 1. A subjective optometric apparatus having an optometric unit in which a light source for illuminating an anterior segment of an eye to be examined is arranged around an optometric window through which a subject looks. A subjective optometric apparatus, which is covered with a light transmitting covering member that transmits light emitted from the light source. 2. The subjective optometric apparatus according to claim 1, wherein the light source includes a plurality of light emitting elements arranged in a ring along the periphery of the optometry window. 3. The subjective optometric apparatus according to claim 1, wherein the covering member has a diffusing surface for irregularly reflecting light emitted from the light source. 4. The subjective optometric apparatus according to claim 1, wherein the covering member is made of a translucent medium. 5. The illuminating light emitted from the light source is radiated at least once through a predetermined optical element to irradiate the eye to be examined while changing the irradiating direction. The subjective optometry apparatus according to any one of the preceding claims.