Visual target calibration method

Abstract

The present invention discloses a method for calibrating a visual target. The method for calibrating a visual target includes the following steps: (a) when the first visual target and the second visual target are outside the observable area, move the observable area until the first visual target or the second visual target appears within the observable area; (b) adjust the focusing mechanism so that the first visual target and the second visual target approach each other; (c) move the observable area back to its original position; and (d) repeat steps (a) to (c) until the first visual target and the second visual target are aligned with each other.

Description

Technical Field

[0001] The present invention relates to an optotype, and in particular to an optotype calibration method. Background Art

[0002] Generally speaking, when a subject undergoing a vision test has nearsightedness or farsightedness, the upper and lower optotypes used for the test can easily become separated horizontally. In other words, if the subject has high nearsightedness or farsightedness and a small pupil size, the horizontally separated upper and lower optotypes are likely to fall outside the subject's visible area. Therefore, current vision testing devices urgently need to calibrate the upper and lower optotypes to improve vision test accuracy. Summary of the Invention

[0003] In view of this, the present invention proposes a sight mark calibration method to effectively solve the above-mentioned problems encountered in the prior art.

[0004] According to one embodiment of the present invention, a method for calibrating an optotype is provided. In this embodiment, the method comprises the following steps: (a) when a first optotype and a second optotype are outside a visible area, moving the visible area until the first optotype or the second optotype appears within the visible area; (b) adjusting a focus mechanism so that the first optotype and the second optotype are closer to each other; (c) moving the visible area back to its original position; and (d) repeating steps (a) to (c) until the first optotype and the second optotype are aligned with each other.

[0005] In one embodiment, step (a) is to move the observable area in a first direction and step (c) is to move the observable area in a second direction, the first direction and the second direction being opposite to each other.

[0006] In one embodiment, steps (a) and (c) are performed by moving a scanning head to move the observable area.

[0007] In one embodiment, step (a) further includes: determining whether the first sight mark or the second sight mark appears within the observable area by image processing.

[0008] In one embodiment, step (b) further includes: adjusting the focus mechanism by controlling a motor through software so that the first sight mark and the second sight mark are brought closer to each other.

[0009] In one embodiment, the sight mark calibration method is applied to a vision testing device.

[0010] In one embodiment, in a vision detection device, the illumination light emitted by the light source module passes through the visual target optical module, the first mirror, the second mirror, and the eyepiece in sequence via the illumination light path, and then enters the pupil of the eye to be measured.

[0011] In one embodiment, the image light generated by reflecting the illumination light from the eye to be measured passes through the eyepiece, the second mirror, and an optical lens module in sequence via the image light path, and then enters a camera module.

[0012] In one embodiment, the vision detection device further includes a control module. The control module is electrically connected to the visual target optical module and the camera module respectively to control the operations of the visual target optical module and the camera module respectively.

[0013] In one embodiment, the vision detection device further includes a control motor. The control motor is electrically connected between the control module and the visual target optical module. The control module controls the operation of the visual target optical module through the control motor.

[0014] Compared with the prior art, the visual target correction method of the present invention can be applied to a vision detection device to correct the positions of upper and lower visual targets. Even if the eyes of the subject undergoing vision detection have high degrees of myopia / hyperopia and their pupil sizes are small, after correcting the upper and lower visual targets by the visual target correction method of the present invention, the upper and lower visual targets can be aligned with each other and will not fall out of the observable area of the subject's eyes. Therefore, the accuracy of vision detection can be effectively improved.

[0015] The advantages and spirit of the present invention can be further understood through the following specific embodiments of the invention and the accompanying drawings of the specification. Description of the Drawings

[0016] Figure 1 It is a flowchart of the visual target correction method in a preferred specific embodiment of the present invention.

[0017] Figure 2 Corresponding to Figure 1 Schematic diagrams of steps S10 to S16.

[0018] Figure 3 It is a schematic diagram of the vision detection device to which the visual target correction method of the present invention is applied.

[0019] Main Element Symbol Description:

[0020] S10 - S18... Steps

[0021] 3... Vision Detection Device

[0022] 30... Light Source Module

[0023] 31...Visual target optical module

[0024] 32...First reflector

[0025] 33...Second reflector

[0026] 34...Eyepiece

[0027] 35...Optical lens module

[0028] 36...Camera module

[0029] 37...Control module

[0030] 38...Control motor

[0031] EYE...Eye to be measured

[0032] PUP...Pupil Detailed implementation manner

[0033] Now, specific embodiments of the present invention will be described in detail, and examples of the specific embodiments will be illustrated in the accompanying drawings. Elements / components denoted by the same or similar reference numerals in the drawings of the specification and the embodiments are used to represent the same or similar parts.

[0034] According to a specific embodiment of the present invention, there is a visual target correction method. In this embodiment, the visual target correction method can be applied to a vision detection device to correct the positions of the upper and lower visual targets for vision detection of a subject, so that the upper and lower visual targets are aligned with each other and do not fall out of the observable area of the subject's eyes.

[0035] Figure 1 This is a flowchart of the visual target correction method in this embodiment. As Figure 1 shown, the visual target correction method includes the following steps S10 to S18:

[0036] Step S10: When the first visual target and the second visual target are outside the observable area;

[0037] Step S12: Move the observable area until the first visual target or the second visual target appears within the observable area;

[0038] Step S14: Adjust the focusing mechanism to cause the first visual target and the second visual target to approach each other;

[0039] Step S16: Move the observable area back to its original position; and

[0040] Step S18: Repeat steps S10 to S14 until the first visual target and the second visual target are aligned with each other.

[0041] In practical applications, the first sight mark and the second sight mark can be upper and lower sight marks and have no particular restrictions on shape and size. Step S12 and step S16 can move the observable area by moving the scanning head, but are not limited thereto.

[0042] In one embodiment, step S12 is to move the observable area in a first direction and step S16 is to move the observable area in a second direction, and the first direction and the second direction are opposite to each other. For example, the first direction is to the left and the second direction is to the right, but not limited thereto.

[0043] In another embodiment, step S12 may determine whether the first sight mark or the second sight mark appears within the observable area by image processing, but the present invention is not limited thereto.

[0044] In another embodiment, step S14 may be to adjust the focus mechanism by controlling a motor through software so that the first sight mark and the second sight mark are brought closer to each other, but the present invention is not limited thereto.

[0045] As for the schematic diagram of the above steps S10 to S18, Figure 2 As shown, no further details are given here.

[0046] then, Figure 3 Schematic diagram of a vision testing device used in the sight mark correction method of the present invention.

[0047] like Figure 3 As shown, the vision detection device 3 includes a light source module 30, a sight mark optical module 31, a first reflector 32, a second reflector 33, an eyepiece 34, an optical lens module 35, a camera module 36, a control module 37 and a control motor 38.

[0048] The camera module 36 and the control module 37 are electrically connected to each other. The control motor 38 is electrically connected to the control module 37. The sight mark optical module 31 is electrically connected to the control motor 38. The control module 37 controls the operation of the camera module 36 and controls the operation of the sight mark optical module 31 through the control motor 38.

[0049] In the vision testing device 3, illumination light emitted by the light source module 30 travels along an illumination light path, sequentially passing through the sight mark optical module 31, the first reflector 32, the second reflector 33, and the eyepiece 34, before entering the pupil PUP of the eye under test. Image light, generated by the illumination light reflected by the pupil PUP of the eye under test, travels along an image light path, sequentially passing through the eyepiece 34, the second reflector 33, and the optical lens module 35, before entering the camera module 36, enabling the camera module 36 to capture an image.

[0050] Compared to existing technologies, the optotype calibration method of the present invention can be applied to correct the position of upper and lower optotypes in vision testing devices. Even if the subject undergoing the vision test has high myopia or hyperopia and a small pupil size, the optotype calibration method of the present invention can align the upper and lower optotypes and ensure they remain within the subject's visible area, effectively improving the accuracy of the vision test.

Claims

1. A visual target correction method, characterized in that, Including: (a) When a first visual target and a second visual target are outside an observable area, In a first direction move the observable area until the first visual target or the second visual target appears within the observable area; (b) Adjust a focusing mechanism to cause the first visual target and the second visual target to approach each other; (c) In a second direction Move the observable area back to its original position , where the first direction and the second direction are opposite to each other ; And (d) Repeat steps (a) to (c) until the first visual target and the second visual target are aligned with each other.

2. The visual target correction method according to claim 1, wherein Steps (a) and (c) move the observable area by moving a scanning head.

3. The visual target calibration method according to claim 1, wherein Step (a) further includes: Determine whether the first visual target or the second visual target appears in the observable area through image processing.

4. The visual target calibration method according to claim 1, wherein Step (b) further includes: Adjust the focusing mechanism by software controlling a motor to cause the first visual target and the second visual target to approach each other.

5. The visual target correction method according to claim 1, characterized in that This method is applied to a vision detection device.

6. The visual target correction method according to claim 5, characterized in that, In the vision detection device, an illumination light emitted by a light source module passes through a visual target optical module, a first mirror, a second mirror, and an eyepiece in sequence along an illumination light path and enters a pupil of an eye to be measured.

7. The visual target correction method according to claim 6, characterized in that, An image light generated by reflecting the illumination light by the eye to be measured passes through the eyepiece, the second mirror, and an optical lens module in sequence along an image light path and enters a camera module.

8. The visual target calibration method according to claim 7, wherein The vision detection device further includes a control module, and the control module is electrically connected to the visual target optical module and the camera module respectively to control the operations of the visual target optical module and the camera module respectively.

9. The visual target calibration method according to claim 8, wherein, The vision detection device further includes a control motor, the control motor is electrically connected between the control module and the visual target optical module, and the control module controls the operation of the visual target optical module through the control motor.

Images