JP2005073924A - Ophthalmic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ophthalmic apparatus capable of simply performing glare examination even if an exclusive target indicator is not prepared. <P>SOLUTION: In the opthalmic apparatus equipped with an ophthalmic apparatus body 1 having a pair of left and right lens chamber units 5 and indicating an examination target to examine the sight of an eye to be examined, glare light projected from the illumination light sources 7R and 7L provided on the side of the ophthalmic apparatus body 1 is reflected by mirrors 10R and 10L to be guided to the eye to be examined. By this constitution, an examination target is indicated to the eye to be examined in a glaring state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optometry apparatus that presents an examination target and inspects an eye to be examined.

There is known an optometry apparatus in which an optical element such as a spherical lens or a cylindrical lens is combined and switched in front of the eye to be examined, and an examination target is presented in front to subjectively examine the refractive power of the eye to be examined. Also. As one of the visual function tests, there is a glare test in which a glare light source is turned on when a test target is presented, and visual acuity is examined in a dazzling state. As a configuration of a conventional device that performs this glare test, a configuration in which a glare light source is disposed on the target presentation device side that is placed in front of the eye to be examined and the glare light source is turned on during the glare test (for example, Patent Document 1).
JP 2002-200041 A

  However, in the configuration of the above-described conventional apparatus, in order to perform the glare inspection, a dedicated optotype presenting apparatus having a glare light source must be prepared, and there is a problem that lacks versatility.

  In view of the above-described problems of the conventional technology, it is an object of the present invention to provide an optometry apparatus that can easily perform a glare test without preparing a dedicated target object presenting apparatus. ,

  In order to achieve the above object, the present invention is characterized by having the following configuration.

(1) In an optometry apparatus that includes an optometry apparatus main body having a pair of left and right lens chamber units that switch and arrange optical elements in an examination window, and presents an examination target and examines the eyesight of the eye to be examined. A glare light source provided; and a reflection member for reflecting light from the glare light source and guiding it to the eye to be examined.
(2) In the inspection apparatus of (1), a holding unit that holds the reflecting member at a position that does not block the observation optical path of the inspection target and in front of the eye to be examined is provided, and the holding unit is attached to the optometry apparatus main body. It is attached.
(3) The holding unit of (2) is configured to be movable between a use position in front of the eye to be examined and a retreat position in which the reflection member is retracted from the front of the eye to be examined.
(4) In the inspection apparatus of (2) or (3), the holding unit also serves as a near rod for holding a near visual target.
(5) In the inspection apparatus of (1), the glare light source is also used as an illumination light source for illuminating a near target attached to a near rod.

  According to the present invention, it is possible to easily perform a glare inspection without preparing a dedicated visual target presenting device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an optometry apparatus according to the present invention.

  Reference numeral 1 denotes an optometry apparatus main body. The optometry apparatus main body 1 is suspended and held by an arm 22 provided on a column 21 erected on an optometry table 20. Reference numeral 40 denotes a space-saving visual target presentation device. The optotype presenting apparatus 40 includes a unit that illuminates the beam splitter, concave mirror, and optotype plate from behind to form a target luminous flux, and optically presents the inspection target at a distance inspection distance of 5 m. Is. Reference numeral 45 denotes a controller for operating the optometry apparatus main body 1 and the optotype presenting apparatus 40.

  FIG. 2 is an external perspective view of the optometry apparatus main body 1. The optometry apparatus main body 1 includes a pair of left and right lens chamber units 5 and a support unit 6 that supports the left and right lens chamber units 5 in a suspended manner. Inside the left and right lens chamber units 5, lens disks arranged on the same circumference as a large number of optical elements such as spherical lenses and cylindrical lenses are rotatably provided. Each of the left and right lens chamber units 5 is provided. The optical element is switched and arranged in the optometry window 5a. The support unit 6 has a slide mechanism that adjusts the distance between the left and right lens chamber units 5 and a convergence mechanism that matches the convergence of the eye to be examined during near-field inspection.

  7R and 7L are illumination light sources provided in the left and right lens chamber units 5, respectively, and are composed of a plurality of white LEDs. The illumination light sources 7R and 7L are used as a glare light source at the time of glare inspection and also serve as an illumination light source that illuminates the near vision target 30. Reference numeral 2 denotes a rod attached to the support unit 6 side via an attachment member 8. A near visual target 30 that is movable in the axial direction is attached to the rod 2 via a holding member 31. The holding member 31 is configured to be rotatable about a horizontal axis, and can jump up the near vision target 30 so as to be parallel to the axial direction of the rod 2.

  Furthermore, mirrors 10R and 10L that reflect light from the illumination light sources 7R and 7L toward the eye to be examined are attached to the rod 2 via a holding member 11 that is movable in the axial direction of the rod 2. The mirrors 10R and 10L are arranged so as to face the optometry apparatus main body 1 so as to be positioned on the front side of the eye to be examined at the time of the glare examination, and are used for the test optotype presented at a distance of 5 m by the optotype presenting apparatus 40. In order not to block the observation optical path, they are arranged on the left and right sides of the observation optical path. As with the holding member 31, the holding member 11 is also configured to be rotatable about a horizontal axis, and the mirrors 10R and 10L are indicated by dotted lines in FIG. 1 so as to be parallel to the axial direction of the rod 2. It can be flipped up to the retracted position. For this reason, at the time of near vision inspection, the target surface of the near vision target 30 can be illuminated by the illumination light sources 7R and 7L with the mirrors 10R and 10L retracted from the front of the eye to be examined.

  The mirrors 10R and 10L may be flat mirrors. However, in this embodiment, the reflection angle of light from the illumination light sources 7R and 7L is widened so that the reflected light of one light source is guided to both the left and right sides of the eye to be examined. The curved surface of the shape.

  Further, the mounting member 8 has a configuration in which the rod 2 can be folded upward, and when the rod 2 is flipped up to the dotted line position in FIG. The target 30 and the mirrors 10R and 10L can be placed at the retracted position where the target 30 is retracted from the field of view of the subject.

  In the present embodiment, the rod 2 for holding the near vision target 30 is also used as the holding unit for holding the mirrors 10R and 10L, but a dedicated holding unit may be provided.

  In the configuration as described above, when performing the glare inspection in which the test target at the distance is displayed by the target display device 40, as shown in FIG. 2, the rod 2 is tilted forward and the mirrors 10R and 10L are moved. Place it in the use position on the front side of the eye to be examined. At this time, the near vision target 30 is flipped upward or removed from the rod 2. FIG. 3 is a view showing the positional relationship between the mirrors 10R and 10L and the test target 40 'presented forward by 5m by the target display device 40 during the distance test. The mirrors 10R and 10L are disposed at a distance of 30 cm from the eye to be examined, for example. In addition, as the presenting apparatus for the inspection target 40 ', an existing target presenting apparatus such as a type in which a visual acuity table is directly arranged at a distance of 5 m, or is projected onto a screen in front of the inspection target 5 mm can be used.

  The switches of the controller 45 are operated to turn on the light sources 7R and 7L. When light is emitted from the light sources 7R and 7L, a virtual image 7R ′ of the light source 7R is formed by the mirror 10R, and a virtual image 7L ′ of the light source 7L is formed by the mirror 10L. Light from the virtual images 7R ′ and 7L ′ travels to the left and right eyes through the inspection window 5a. Therefore, since glare light is projected from the virtual images 7R ′ and 7L ′, a glare test can be performed in which the test target 40 ′ is presented in a dazzling state to the eye to be examined. In this state, the controller 45 is operated to switch the optical element such as a spherical lens or a cylindrical lens arranged in the examination window 5a, thereby correcting the refractive abnormality of the eye to be examined and performing a visual acuity examination. In addition, the inspection target can be switched by operating the controller 45. The illumination light quantity of the glare light is changed by adjusting the number of lighting LEDs constituting the light sources 7R and 7L or adjusting the light quantity of each LED.

  In addition, the glare inspection is possible even during the near-field inspection. In this case, the near visual target 30 that has been flipped upward is positioned in front of the eye to be examined. At this time, the near vision target 30 is located between the mirror 10R and the mirror 10L. For this reason, the near vision target 30 is illuminated by the light sources 7R and 7L, and the illumination light is reflected by the mirrors 10R and 10L located on both sides, and glare light is projected from the virtual images 7R ′ and 7L ′ as described above. It becomes lighted. Thereby, the glare test | inspection in the state which showed the near vision target 30 can be performed easily.

  As described above, in the present embodiment, the reflection surfaces of the mirrors 10R and 10L serving as the reflection members are formed in a convex curve shape, so that the reflection angle is widened and the reflected light from one light source can be guided to the left and right eyes. . Of course, the reflecting surfaces of the mirrors 10R and 10L may have a flat plate shape. Further, by adjusting the reflection angle of the mirrors 10R and 10L held by the holding member 11, even when the arrangement distance of the mirrors 10R and 10L is adjusted or the interval between the lens chamber units 5 is adjusted, It becomes possible to guide reflected light to the eye to be examined.

  Further, the arrangement positions of the mirrors 10R and 10L may be arranged such that the observation optical path of the target is up and down, or may be arranged in four directions of left and right and up and down. In the above embodiment, the mirrors 10R and 10L are held by the optometry apparatus body 1 by the holding unit including the holding member 11 and the rod 2, but may be configured to be placed on the optometry table 20. Further, since the housing itself of the space-saving target presentation device 40 is placed at a distance of about 1 m in front of the eye to be examined, mirrors 10R and 10L are disposed on both the left and right sides of the target observation window of the housing, It is good also as a structure which reflects the light of 7R and 7L and projects glare light to the eye to be examined.

  Further, the arrangement of the light sources 7R and 7L that emit glare light may be provided on the support unit 6 or the arm 23 on the optometry apparatus main body 1 side.

1 is a schematic configuration diagram of an optometry apparatus according to the present invention. It is an external appearance perspective view of an optometry apparatus main body. It is the figure which showed the positional relationship of the test | inspection target shown 5m ahead by the mirror at the time of a distance test | inspection, and a target presentation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optometry apparatus main body 2 Rod 7R, 7L Illumination light source 10R, 10L Mirror 11 Holding member 30 Near-field target

Claims (5)

In an optometry apparatus that includes an optometry apparatus body having a pair of left and right lens chamber units that switches and arranges optical elements in an examination window and presents an examination target and examines the eyesight of the eye to be examined, provided on the optometry apparatus body side An optometry apparatus comprising: a glare light source; and a reflection member for reflecting light from the glare light source and guiding it to the eye to be examined. The inspection apparatus according to claim 1, further comprising a holding unit that holds the reflecting member at a position that does not block an observation optical path of the inspection target and in front of the eye to be examined, and the holding unit is attached to the optometry apparatus main body. An optometry apparatus characterized by comprising: The optometry apparatus according to claim 2, wherein the holding unit is configured to be movable between a use position in front of the eye to be examined and a retreat position in which the reflection member is retracted from the front of the eye to be examined. 4. The optometry apparatus according to claim 2, wherein the holding unit also serves as a near rod for holding a near visual target. 2. The optometry apparatus according to claim 1, wherein the glare light source is also used as an illumination light source for illuminating a near vision target attached to a near vision rod.

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