JP3681705B2 - A subjective optometry device using a continuously variable power lens. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optometry apparatus, and more particularly to a subjective optometry apparatus that can quickly perform an optometry.
[0002]
[Prior art]
There has been proposed a subjective optometry apparatus that includes optometry lenses of various powers, and that performs conscious optometry by selectively causing each optometry lens to face an optical path with respect to the eye to be examined.
[0003]
[Problems to be solved by the invention]
In such a subjective optometry apparatus, the lens itself had to be changed in order to change the power, so it is necessary to prepare optometry lenses of various powers to cope with the refractive powers of various eyes to be examined. was there.
[0004]
Therefore, an object of the present invention is to provide a subjective optometry apparatus capable of performing quick optometry without preparing an optometry lens corresponding to each eye to be examined.
[0005]
[Means for Solving the Problems]
A subjective optometry apparatus according to claim 1, wherein an optometry lens is arranged in a pair of left and right optometry windows to perform a subjective optometry, and an Alvarez lens whose power is continuously changed is used as the optometry lens. And arranged in each of the pair of left and right optometry windows .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An optometry apparatus 1 shown in FIG. 1 is an optometry apparatus to which a subjective optometry means 6 composed of a subjective optometry apparatus according to the present invention is applied. A support column 3 and first and second support members 3 are provided above an optometry table 2. The subjective optometry means 6 and the objective optometry means 7 which are also shown in FIG. 2 each suspended from the arms 4 and 5, and the support plate 8 attached to the end face of the objective optometry means 7. A mirror member (dichroic mirror) 10 having optical characteristics of visible light transmission and infrared light reflection of 45 degrees inclined facing the right and left optometry windows 9a and 9b of the subjective optometry means 6; An input unit 12 having an operation unit 11 for inputting various operation signals arranged on the optometry table 2 and a display unit 12a including a liquid crystal display for displaying various types of optometry information, an anterior face image of the eye E, and the like; The optometry table It includes the other party to 3m from the visual acuity testing means 6, and a visual acuity chart device 13 for presenting target C vision for far vision, which will be disposed in 5m like.
[0008]
The subjective optometry means 6 according to the present invention schematically shown in FIG. 3 includes first, second and third lens disks 21 and 22 each having a pair of left and right lens mounting members in a box-shaped unit 15. And 23. These three pairs of lens discs are, for example, a spherical lens group constructed in 0.25D units for each first lens disc 21, a cylindrical lens group for each second lens disc 22, and Each third lens disk 23 has an auxiliary lens group attached in a circular arrangement. The first, second, and third lens disks 21, 22, and 23 are driven independently by the lens driving unit 24 on the left and right sides.
[0009]
The auxiliary lens disposed on the third lens disk 23 is preferably a continuous power variable lens (Alvarez lens) 15 as shown in FIGS. The continuous power variable lens 15 is composed of a pair of glass bodies 16 having curved surfaces with a predetermined curvature distribution, and both the curved surfaces are opposed to each other through a gap and are relatively slid or rotated in a direction perpendicular to the optical path. Thus, the frequency (D) is continuously changed from a negative value to a positive value.
[0010]
More specifically, as shown in FIG. 4, the pair of glass bodies 16 oppose one convex portion and the other concave portion (near the point having the same absolute value and negative curvature as the convex portion) on the optical path. In this case, the power of the continuous power variable lens 15 is ± 0. When the pair of glass plates 16 are relatively slid from this state and the convex portions are opposed to each other on the optical path as shown in FIG. 5, the frequency shows a positive value. On the other hand, when the concave portions are opposed to each other on the optical path as shown in FIG. 6, the frequency becomes a negative value.
[0011]
Further, as the pair of glass bodies 16 slide relative to each other, the curvature at the point where the optical path intersects with each curved surface changes continuously. Along with this, the power of the continuous power variable lens 15 continuously changes as desired.
[0012]
By using such a continuous power variable lens 15, it is possible to change the power while maintaining the position without changing the lens, and to the eye E having various refractive powers. Cloud fog can be applied over a wide range.
[0013]
As shown in FIG. 7, the objective optometry means 7 has a pair of cover glasses 25 at the end on the mirror member 10 side in a configuration that is separated from both left and right eyes and is symmetrically arranged. A pair of targets 26, a dichroic mirror 27 that reflects a pair of infrared light and transmits visible light, a knife edge 28 for shielding a part of the pair of light beams, a pair of relay lenses 29, and a pair of focusing lenses 30. , A pair of dichroic mirrors 33 that reflect infrared light and transmit visible light, a pair of imaging lenses 31, and a pair of CCD cameras 32, and the left and right eyes to be examined in a range of, for example, -3D to + 3D by a photorefractive method. E objective optometry is performed.
[0014]
Instead of the objective optometry means 7, it is also possible to use an objective optometry means 7A shown in FIG.
[0015]
The objective optometry means 7A has an internal configuration substantially the same as the configuration on one side of the objective optometry means 7, and on the outside of the cover glass 25, a cross-arranged cross mirror 61 and a pair of left and right opposing the cross mirror 61 The reflecting mirrors 61a and 61b are used to oppose the left and right optometry windows 9a and 9b of the subjective optometry means 6 so that they are switched to the left or right or projected onto the CCD camera 32 simultaneously.
[0016]
In FIG. 8, reference numeral 35 denotes an auxiliary lens using a spherical lens or the like that is appropriately inserted and removed between the cover glass 25 and the half mirror 27. By using this auxiliary lens 35, the objective optometry means 7A. The measurement range can be expanded from, for example, normal -10D to + 10D to -20D to + 20D.
[0017]
The visual acuity table device 13 uses a subjective display visual acuity table as shown in FIG. 1 or a projection visual acuity table (not shown), and can also be used as a fixation target for other purposes. .
[0018]
FIG. 9 shows a configuration in which one objective optometry unit 7-1 for the right eye, for example, which constitutes the objective optometry means 7 can be attached to and detached from the subjective optometry unit 6A, which is also configured separately from the left and right. Is.
[0019]
That is, by engaging the groove 51 provided in the objective unit 7-1 with the rail 52 provided in the subjective optometry unit 6A and sliding the objective unit 7-1, the objective unit 7 -1 can be combined with the subjective optometry unit 6A, and the mirror member 10a suspended from the objective sensation unit 7-1 faces the optometry window 55 of the subjective optometry unit 6A.
[0020]
Further, when the objective unit 7-1 is removed from the subjective optometry unit 6A, the objective optometry 7-1 can be performed independently on the eye E as shown in FIG. It becomes possible. In FIG. 10, reference numeral 56 denotes an operation handle attached to the objective unit 7-1.
[0021]
Next, the input means 12 will be described with reference to FIGS.
[0022]
The operation unit 11 of the input means 12 is provided with a number of keys for instructing various operations of the subjective optometry means 6 and the objective optometry means 7.
[0023]
Keys for setting each eye for left eye, right eye in objective optometry mode, objective optometry mode, distance mode, subjective mode, objective optometry mode among others, etc. Various keys are provided.
[0024]
Such an instruction can also be given from the mouse 36.
[0025]
Various modes are displayed on the display unit 12a of the input unit 12. That is, as shown in FIG. 11, when using the subjective optometry means 6 together with the spherical power, astigmatism power, astigmatism axis value and visual acuity value by the objective optometry means 7, as well as the anterior face image of the eye E to be examined. Right eye and left eye target images (including fixation targets at the time of other objectives), an icon I of the mouse 36, and the like are displayed.
[0026]
Further, as shown in FIG. 12, the display unit 12 a of the input unit 12 includes the anterior face image of the eye E and the spherical power, the astigmatic power, and the left and right binocular values of the astigmatic axis by the objective optometry means 7. In some cases, the spherical power, the astigmatic power, and the values of the left and right eyes of the astigmatic axis are displayed in a list by the subjective optometry means 6, and the visual acuity value (1.2, 1.5, etc.) and the target image are also displayed. is there. In this case, the visual acuity value 1.2 obtained by the actual optometry may be displayed in reverse as shown by a rectangle in FIG.
[0027]
Furthermore, as shown in FIG. 13, together with the anterior face image of the eye E to be examined, the spherical power and astigmatism power by the objective optometry means 7, the values of the left and right eyes of the astigmatism axis, the spherical power by the subjective optometry means 6 and astigmatism. In some cases, the frequency and the values of the left and right eyes of the astigmatic axis are displayed in a list.
[0028]
Furthermore, as shown in FIG. 14, the image of only one side of the eye E, the spherical power by the objective optometry means 7, the astigmatism power, the value of the astigmatism axis and the spherical power by the subjective optometry means 6, the astigmatism power, It is also possible to display the value of the astigmatism axis together with the visual acuity value, and also display an optotype image corresponding to the visual acuity value at the time of optometry by the subjective optometry means 6 and specify it with the icon I.
[0029]
In order to eliminate the influence of the reflection of the measurement light of the objective optometry means 7 by the subjective optometry means 6, the light of the objective optometry means 7 with respect to the eye to be examined, the subjective optometry means 6 and the optical axis of the visual acuity table. In order to tilt the axis, the mirror alone or the entire body may be tilted.
[0030]
Next, a control system of the optometry apparatus 1 will be described with reference to FIG.
[0031]
The optometry apparatus 1 includes a control unit 40 including a control unit 41 including a CPU that performs overall control, and a program memory 42 that stores an operation program. The control unit 41 includes the control unit 41 that includes the subjective optometry unit 6. Two lens driving units 24 are connected.
[0032]
Further, the control unit 41 calculates the refractive power of the eye E based on the two CCD cameras 32 of the objective optometry means 7 and the reflected light beam of the infrared light applied to the eye E to determine the visual acuity value and the spherical power. The calculation unit 43 for obtaining the astigmatism power, the astigmatism axis, and the like is connected.
[0033]
Further, the input unit 12 is connected to the control unit 41, and the slide driving unit 70, the target switching unit 80 of the visual acuity table device 13, and the printer 90 (not shown in FIG. 1) are connected.
[0034]
The CPU of the control unit 41 may be separate for the subjective optometry means 6 and the objective optometry means 7, or may be a single one for both.
[0035]
Next, the operation of the union optometry apparatus 1 having the above-described configuration will be described with reference to FIG.
[0036]
The examiner fixes the eye E in the vicinity of the optometry windows 9a and 9b of the subjective optometry means 6 and arranges it at a predetermined position by the slide mechanism unit 70 via the subjective optometry means 6 and the mirror member 10. After making the optotype C of the visual acuity table device 13 confront, the objective eye optometry mode is set by the operation unit 11 and measurement is started.
[0037]
First, the objective optometry means 7 performs a pre-measurement with respect to the eye E (S1). At this time, if it is within this measurable range by the objective optometry means 7 (S2), based on the control of the control unit 41. The main measurement is started (S4). On the other hand, if it is out of the measurement range, the lens driving unit 24 of the subjective optometry means 6 operates under the control of the control unit 41, and the continuous power variable lens 15 is inserted into the optical path (S3). Return to. When a continuous power variable lens that is an auxiliary lens is inserted, the power can be changed in accordance with the refractive power of the eye to be examined. There is no, and optometry is performed smoothly.
[0038]
The main measurement is completed, and the objective optometry data obtained by the objective optometry of the eye E is obtained by the calculation unit 43 and sent to the control unit 41 (S5). As a result, the objective eye examination data is displayed on the display unit 12a in any one of the modes shown in FIGS. 10 to 13 under the control of the control unit 41.
[0039]
This objective measurement is performed separately for the left and right eyes or for both eyes simultaneously.
[0040]
Thus, the first stage process before the subjective optometry is completed (S6).
[0041]
Next, the examiner sets a subjective optometry mode using the operation unit 11 and starts subjective measurement (S7). At this time, the objective measurement result is automatically set in the subjective optometry means 6.
[0042]
That is, the lens driving unit 24 is operated based on the lens selection operation of the operation unit 11 performed according to the response of the subject, and whether or not the spherical lens or the cylindrical lens in the subjective optometry means 6 has moved in units of 0.25D, for example. Is determined (S8), if it moves, a pre-measurement is performed (S9). At this time, as in the case of the first stage, if it is within the measurable range by the objective optometry means 7 (S11), the control is performed. The main measurement is automatically started based on the control of the unit 41 (S12). On the other hand, if it is not measurable range, the lens driving unit 24 of the subjective optometry means 6 operates under the control of the control unit 41, and the continuous power variable lens 15 is inserted into the optical path (S10). Return. Here, similarly, there is no trouble of exchanging with an auxiliary lens corresponding to the eye to be examined.
[0043]
In this case, the optical characteristics of the spherical lens or cylindrical lens provided for the subjective optometry are displayed together with the objective optometry data on the display unit 12a under the control of the control unit 41 (S13). By such subjective optometry, optical characteristics such as spherical power of the lens to be prescribed for the eye E can be screened in an objective manner and automatically obtained as needed regardless of the response of the subject. Thereafter, it is determined whether or not to end (S14), and the optometry ends.
[0044]
Alternatively, after obtaining the subjective optometry data of the lens to be prescribed for the eye E, the subject's eye E is caused to wear a lens prescribed based on the subjective optometry data, and the examiner again The operation unit 11 is operated to set the objective optometry mode. As a result, the objective optometry in the state where the final lens is worn by the objective optometry means 7 is executed, and the examiner confirms that the spherical power, cylindrical power, astigmatic axis, etc. of the prescribed lens are truly appropriate. It can be confirmed objectively.
[0045]
Further, by comparing the subjective optometry data based on the response of the subject with the objective data obtained by the objective optometry means 7, whether or not the lens prescribed by performing the red glee test is overcorrected. This can also be easily determined.
[0046]
The working distance between the objective optometry means 7 and the eye E to be examined in the optometry apparatus 1 differs depending on the arrangement of the objective optometry means 7 with respect to the subjective optometry means 6, but the objective type based on the photorefractive method. In the case of the optometry means 7, as shown in FIGS. 17 and 18, the light amount distribution of the pupil of the eye E to be examined is represented by an inclination amount α on the light receiving element of the CCD camera 32, and the difference is calculated by the calculation unit 43. We are looking for refractive power.
[0047]
The subjective optometry apparatus of the present invention is not limited to the embodiment as an application to the optometry apparatus as described above. For example, various configurations within the scope of the gist such as the configuration of the subjective optometry apparatus alone are available. Deformation is possible.
[0048]
【The invention's effect】
According to the invention of the present application, the optometry lens of the subjective optometry apparatus is configured to have a continuously variable power lens, so that the power can be changed while the lens position remains unchanged, and the optometry is performed quickly. be able to.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is an enlarged side view of a subjective optometry means and an objective optometry means according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a continuously variable power lens used in the subjective optometry means of the embodiment of the present invention. FIG. 5 shows a power change state of the continuous power variable lens shown in FIG. FIG. 6 is a diagram showing a power change state of the continuous power variable lens shown in FIG. 4. FIG. 7 is an optical configuration diagram of objective optometry means according to the embodiment of the present invention. FIG. 9 is a perspective view showing an attachment state of the objective unit and the subjective optometric unit as separate bodies on the left and right sides. FIG. 10 is an objective type shown in FIG. FIG. 11 is an explanatory diagram of a state in which an objective optometry is performed by the optometry unit. FIG. 12 is a perspective view showing the display mode of the display unit in the embodiment of the present invention. FIG. 13 is a perspective view showing the display mode of the display unit in the embodiment of the present invention. 14 is a perspective view showing a display mode of the display unit in the embodiment of the present invention. FIG. 15 is a block diagram showing a control system in the embodiment of the present invention. FIG. 16 shows an operation of the embodiment of the present invention. Flowchart [FIG. 17] An explanatory diagram showing the relationship between the amount of light in the pupil of the eye to be examined and its tilt amount. [FIG. 18] An explanatory diagram showing the relationship between the amount of light in the pupil of the eye to be examined and its tilt amount.
DESCRIPTION OF SYMBOLS 1 Optometry apparatus 6 Subjective optometry means 7 Objective optometry means 10 Mirror member 12 Input means 15 Continuous power variable lens 16 A pair of glass body 21 1st lens disc 22 2nd lens disc 23 3rd lens circle Board

Claims (1)

In subjective optometric apparatus arranged trial lens on a pair of right and left test windows performing eye examination of the subjective-type, disposed on each of the pair of right and left test windows with Alba Let lenses of varying power continuously as the trial lens visual acuity testing apparatus, characterized in that the.

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