CN110726532A - Focusing point detection method of contact lens - Google Patents
Focusing point detection method of contact lens Download PDFInfo
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- CN110726532A CN110726532A CN201810785768.2A CN201810785768A CN110726532A CN 110726532 A CN110726532 A CN 110726532A CN 201810785768 A CN201810785768 A CN 201810785768A CN 110726532 A CN110726532 A CN 110726532A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a focus point detection method of contact lenses, which can firstly wear a trial wearing contact lens with a plurality of detection base points on the surface of the cornea of an eye, and shoot the eye wearing the trial wearing contact lens by utilizing an image pick-up device, to obtain a shot picture, calculating the distance between a plurality of detection base points and the corneoscleral edge of the eyes from the shot picture by an electronic device, so as to obtain the focus position of the eye on the contact lens for trial wearing, and then manufacturing the contact lens according to the focus position on the contact lens for trial wearing, so that the optical center of the surface of the contact lens conforms to the visual axis center of the eye, thereby the manufactured contact lens can conform to the correct focusing position of the eye, in addition, in the detection process of the eyes, no object is used for shielding and influencing the sight, and the aim of improving the accuracy of detecting the focus point is fulfilled.
Description
Technical Field
The invention relates to a method for detecting a focus point of a contact lens, in particular to a method for shooting an eye wearing a contact lens for trial use by using a camera device, and calculating the distance between a plurality of detection base points and the corneoscleral edge of the eye from a shot picture by using an electronic device to obtain the position of the focus point, so that the optical center of the manufactured contact lens can accord with the correct focus position of the eye.
Background
Along with the research and development and innovation of various electronic and electrical products, people are convenient and fast in daily life and work, especially, the popularization of the application of 3C electronic products is caused due to the mass appearance of 3C electronic products, so that many people are immersed in the application field of the 3C electronic products, the 3C electronic products are widely used for a long time, no matter office workers, student groups or middle-aged and old people, the coverage range is wide, the phenomenon of head lowering is derived, the conditions of eye vision loss, injury and the like of many people are serious day by day, the myopia population is relatively improved, in order to correct the myopia, the people need to wear glasses to correct the vision, the glasses are products worn by many people except common frame type glasses, however, the glasses can also be used for correcting the myopia or presbyopia condition, on the lens of the contact lens, the setting modes of different curvatures of the inner layer and the outer layer are adopted through the central optical area, the peripheral optical area and the like of the lens, so that external light can be clearly projected and imaged on the retina of an eyeball, then the light is imaged on a preset viewpoint in front of the retina through the peripheral optical area, a clear image can be provided in the center of the visual field of the eyeball, and the visual correction effect of delaying or preventing the myopia from being deepened can be achieved due to the fact that the degree of the peripheral visual field is slightly insufficient.
However, referring to fig. 7 and 8, before the contact lens is prepared, the contact lens wearer must select a trial type frame lens suitable for correcting the degree of vision of the user, after confirming the degree of vision correction of the user, then prepare a contact lens a for wearing on the corneal surface of the user's eye, and the user blinks to cover and stick the contact lens a on the corneal surface, but at the time of preparing the contact lens a, the optical center position b of the contact lens a is prepared at the midpoint of the contact lens a (i.e. the center of the intersection point of the longitudinal axis and the transverse axis) so that the radian of the contact lens a extends from the center point to the outside to prepare the contact lens a with a fixed radian, but because the included angle (Kappa angle, which is about between 2 ° and 11 °) between the pupillary axis and the visual axis of each user's eye is different, moreover, the eyeball, the white of the eye and the cornea around the eyeball of the eye have arc surfaces with different radians, the radian of the cornea of each user is not the same, therefore, the focus positions of the eyes of different users are different from the center c of the two eyes, and the white height of the eyes is lower near the ears and higher near the nose due to the muscle relationship, therefore, when the contact lens a is worn, it will be deviated or inclined toward the ear, so if the optical center position b of the contact lens a is fixed at the center position, but not the actual focal point position of the eye, will cause that when the wearer wears the contact lens a, the time for the eye blinking to adapt to the contact lens a will be lengthened, and the optical center position b of the contact lens a is not in line of sight and has errors, which causes discomfort when the user wears the contact lens a and watches the contact lens.
Some manufacturers provide trial contact lenses to users for trying to fit the users, so that the users experience whether the radian of the trial contact lenses conforms to the radian of the cornea of the wearer, however, the optical center position of the trial contact lenses or the actually used contact lenses is set at the midpoint position of the contact lenses, and for different users with different Kappa angles, which may have different focus points, the trial contact lenses cannot be improved by the trial contact lenses, so that there are many disadvantages and troubles in application, and in the trial contact lenses, the optometrists observe the sliding amount of the trial contact lenses on the eyes of the users through slit lamps, and the optometrists only can roughly evaluate the sliding amount of the contact lenses with the naked eyes, find out the contact lens parameters which best conform to the shape of the cornea of the patients through the trial contact lenses, and then manufacture the contact lenses for the users, however, the accuracy of the focus acquisition increases with the error value.
Therefore, how to try to solve the above-mentioned drawbacks and inconveniences is a direction that people in the industry are keenly looking to research and improve.
Disclosure of Invention
The main object of the present invention is to provide a contact lens for trial wearing with a plurality of detection base points, which can be first worn on the corneal surface of an eye, and an image pickup device is used to photograph the eye wearing the contact lens for trial wearing to obtain a photographed image, and an electronic device is used to calculate the distance between the plurality of detection base points and the corneal scleral edge of the eye from the photographed image to obtain the focus position of the eye on the contact lens for trial wearing, and then a contact lens can be manufactured according to the focus position on the contact lens for trial wearing so that the optical center of the surface of the contact lens can be matched with the visual axis center of the eye, thereby achieving the purpose that the manufactured contact lens can be matched with the focus position of the eye.
The secondary objective of the present invention is to provide a plurality of detection base points of the contact lens for fitting, which are disposed at the edge of the contact lens for fitting without affecting the viewing line of the eye, so that the center of the contact lens for fitting will not be shielded by an object and will not affect the viewing line, and the user can view the external environment, thereby achieving the purpose of improving the accuracy of detecting the focus point.
Another objective of the present invention is to provide a projection apparatus for imaging a cross coordinate mark on the surface of the contact lens for fitting, so that the cross coordinate mark is displayed on the shot image shot by the camera apparatus, thereby assisting the electronic apparatus to calculate the distance, and the inspector can also check whether the distance calculated by the electronic apparatus is correct by looking at the cross coordinate mark in the shot image, thereby achieving the purpose of improving the accuracy of calculating the position of the focus point.
It is another object of the present invention to provide a projection apparatus for imaging a cross mark on a surface of a contact lens for fitting, so that the contact lens can be applied to various types of contact lenses without directly providing a cross axis on the surface of the contact lens for fitting, and the contact lens can be used for detecting a focus point and then be reused for other purposes, thereby achieving the purpose of recycling and environmental protection.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a front plan view of the present invention.
Fig. 3 is a side view of the trial contact lens of the present invention after wear.
Fig. 4 is a usage state diagram of the imaging device and the electronic device according to the present invention.
FIG. 5 is a schematic view of an image of a contact lens for trial use taken by the image pickup apparatus according to the present invention.
Fig. 6 is a side view of the contact lens of the present invention after wearing.
Fig. 7 is a front plan view of a conventional trial contact lens.
Fig. 8 is a schematic diagram of a conventional trial contact lens test.
Reference numeral 1-try on contact lenses; 11-detecting a base point; 12-a focus point; 2-the eye; 21-cornea of the eye; 22-corneoscleral edge; 23-center of visual axis; 24-the retina; 3-a camera device; 31-shooting a picture; 4-an electronic device; 5-contact lenses; 51-optical center; 6-a projection device; 61-cross coordinate marker; 7-a light emitting source; a-a contact lens; b-optical center position; c-the median of both eyes.
Detailed Description
To achieve the above objects and advantages, the present invention provides a technical solution and a structure thereof, wherein the following detailed description is provided for the preferred embodiments of the present invention.
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, which are respectively a flowchart, a front plan view, a side view of the contact lens after being worn, a usage status diagram of the image capturing device and the electronic device, a schematic diagram of the image capturing device capturing a picture of the contact lens after being worn, and a side view of the contact lens after being worn, it can be clearly seen from the drawings that the contact lens 1 for trial wearing of the present invention can be performed according to the following detection steps when performing detection:
(A01) the trial contact lens 1 having a plurality of detection base points 11 may be first worn on the surface of the cornea 21 of the eye 2.
(A02) The image pickup device 3 picks up an image of the eye 2 on which the trial contact lens 1 is worn, and acquires an image pickup screen 31.
(A03) The electronic device 4 calculates the distances between the plurality of detection base points 11 and the corneoscleral edge 22 of the eye 2 from the imaging screen 31, and calculates the position of the focus point 12 of the eye 2 on the trial contact lens 1.
(A04) The contact lens 5 can be made based on the position of the focal point 12 on the trial contact lens 1 such that the optical center 51 of the surface of the contact lens 5 coincides with the visual axis center 23 of the eye 2.
The plurality of base detection points 11 of the contact lens 1 for trial wearing in the step (a01) may be disposed adjacent to the edge of the contact lens 1 for trial wearing, and the positions are based on the line of sight that does not affect the view of the eye 2, and the plurality of base detection points 11 are preferably four points, i.e. they may be disposed at the four axial (i.e. 0 °, 90 °, 180 ° and 270 ° angular directions, respectively) positions of the X, Y axis direction on the surface of the contact lens 1 for trial wearing, but in practical applications, the plurality of base detection points 11 may be disposed at least three points of the X, Y axis, or at least two, three, four, five, six or more, etc. plurality of base detection points 11 may be disposed at any position of the edge of the contact lens 1 for trial wearing, and at least two base detection points 11 need to be disposed at the edge of the contact lens 1 for trial wearing, so that the relative distance between the two base detection points 11 and the corneoscleral edge 22 of the eye 2 can be passed, to calculate the position of the focal point 12 of the eye 2 on the trial contact lens 1.
And the step (a01) can be further performed in combination with the following steps:
(A011) the projection device 6 projects and images a cross coordinate mark 61 on the surface of the trial contact lens 1, and the four ends of the cross coordinate mark 61 are a plurality of detection base points 11 passing through the trial contact lens 1.
Since the cross coordinate mark 61 is formed on the surface of the contact lens 1, after the image is captured by the image capturing device 3 in the step (a02), the captured image 31 will capture and display the cross coordinate mark 61 together, so that the electronic device 4 in the step (a03) can use the cross coordinate mark 61 to assist in calculating the distance, and the inspector can also check whether the distance calculated by the electronic device 4 is correct by looking at the cross coordinate mark 61 in the captured image 31, thereby improving the accuracy of calculating the position of the focus point 12; moreover, the cross coordinate mark 61 is formed on the surface of the try-on contact lens 1 by projection, so that the cross coordinate axis does not need to be directly arranged on the surface of the try-on contact lens 1, thereby being applicable to various types of contact lenses, and the cross coordinate axis is not directly arranged, so that the try-on contact lens 1 can be provided for other purposes again after being used for detecting the focus 12, thereby achieving the effects of reusability and environmental protection.
Moreover, the step (A011) can be further performed in combination with the following steps:
(A012) the eye 2 is illuminated by a light source 7 (e.g., slit lamp) and a focused projection image of the light source is reflected from the surface of the trial contact lens 1, i.e., the position of the focal point 12 of the trial contact lens 1.
Since the contact lens 1 for trial use can utilize the light source 7 to make the surface display the focused projection image, the detection personnel can assist in determining the position of the focus point 12 by the focused projection image, and can further calculate the distance amount by matching with the cross coordinate mark 61 in the step (a011), so as to improve the speed and accuracy of obtaining the focus point 12.
In addition, the image capturing device 3 in the step (a02) may be an apparatus with a shooting function such as a digital camera or a video camera, the shot picture 31 taken by the image capturing device 3 may be a photo or a movie, and the shot picture 31 may preferably be a movie, that is, information such as the sliding direction, the sliding speed, the sliding distance, or the rotation amount of the trial contact lens 1 on the eye 2 can be known from the movie-type shot picture 31, so that the optical center 51 of the manufactured contact lens 5 can be made to better correspond to the position of the visual axis center 23 of the eye 2 by using the above information.
In addition, after the image pickup device 3 in the step (a02) captures the image of the captured image 31, since the plurality of detection base points 11 are provided on the surface of the contact lens 1 for fitting, the rotation amount before and after the sliding can be known from the plurality of detection base points 11 displayed on the captured image 31, and whether or not the contact lens 1 for fitting is rotated during the focusing can be known from the rotation amount.
Moreover, the electronic device 4 in the step (a03) can be a desktop computer, a notebook computer, an industrial computer or other electronic devices 4 with computing function, and the electronic device 4 is associated with a cameraThe device 3 is electrically connected, the image capturing device 3 can transmit the captured image 31 to the electronic device 4, and the preset computing system inside the electronic device 4 is utilized to calculate the distance between the plurality of detection base points 11 of the try-on contact lens 1 and the corneoscleral rim 22 of the eye 2 [ for example:
wherein the A, B, C, D point coordinates are (X1, 0), (X2, 0), (0, y1), (0, y2) respectively), so as to obtain the offset distance of the trial contact lens 1 on the cornea 21 of the eye 2 by the relative distance difference between the plurality of detection base points 11 and the corneoscleral edge 22 of the eye 2, for example, the distance difference between the two detection base points 11 at the two ends of the X-axis and the corneoscleral edge 22I.e. the offset of the trial contact lens 1 in the X-axis direction, and the distance difference between the two detection base points 11 located at the two ends of the Y-axis and the corneal scleral edge 22
The offset of the trial contact lens 1 in the Y-axis direction; the distance between the plurality of detection base points 11 of the try-on contact lens 1 and the corneoscleral rim 22 of the eye 2 can be represented by the equation [ i.e. the distance between two points ]
Is calculated, and the distance between the focal point 12 and the X, Y axis is calculated
After the focus point 12 is calculated on the trial contact lens 1 in the step (a03), the method may further include the following steps:
(A031) the mark is made recognizable at the position of the focal point 12 of the trial contact lens 1.
After the mark for identification is made at the position of the focusing point 12 of the contact lens 1, the position of the focusing point 12 can be easily identified by using the mark in the step (a04) for facilitating the subsequent manufacturing of the contact lens 5.
In the step (a04), the default optical center of the trial contact lens 1 is shifted from the original geometric center of the trial contact lens 1 (i.e., the center of the curved surface of the trial contact lens 1) to the focal point 12 so that the optical center 51 of the contact lens 5 manufactured subsequently can be reliably matched with the visual axis center 23 of the eye 2 when worn.
When a user actually performs a detection operation before dispensing a contact lens 5, the user can first select a try-on contact lens 1 with a suitable curvature, and wear the try-on contact lens 1 on the surface of the cornea 21 of the eye 2, and the user can adjust the try-on contact lens 1 by blinking so that the try-on contact lens 1 covers the surface of the cornea 21, and after the try-on contact lens 1 is worn on the eye 2, the user can photograph the eye 2 wearing the try-on contact lens 1 by using the image pickup device 3 to obtain a photographed image 31, at this time, the image pickup device 3 will transmit the photographed image 31 to the electronic device 4, and the electronic device 4 can calculate distances between a plurality of detection base points 11 and the corneal scleral edge 22 of the eye 2 from the photographed image 31 by using a two-point distance formula [ i.e. [ a (x1, 0) to B (x 2) in the figure, 0) Is the distance of
The distance from the point C (0, y1) to the point D (0, y2) is
So as to know the offset of the trial contact lens 1 after wearing, the position of the focus point 12 of the eye 2 on the trial contact lens 1 can be known by the offset (the focus point 12 can be matched with the visual axis center 23 of the eye 2), and then the contact lens 5 can be manufactured according to the position of the focus point 12 on the trial contact lens 1, so that the optical center 51 of the surface of the contact lens 5 is matched with the visual axis center 23 of the eye 2, and the manufactured contact lens 5 can shorten the temporary blurring time of the vision when wearing the contact lens 5, and the eye 2 can be quickly adapted to the contact lens 5, so that the vision image can be correctly focused on the retina 24 of the eye 2Therefore, the user can obtain clear visual images and avoid watching discomfort after wearing the contact lens 5, thereby achieving the purpose of improving the accuracy of the contact lens 5.
However, after the trial contact lens 1 is worn on the eye 2, since the plurality of detection base points 11 are disposed at the edge of the trial contact lens 1 without affecting the viewing line, no object is hidden at the center of the trial contact lens 1 and does not affect the viewing line, so that the user can view the external environment, and the accuracy of detecting the focus point 12 can be improved.
The invention has the following advantages:
after the trial contact lens 1 is worn on the surface of the cornea 21 of the eye 2, the image pickup device 3 can be used to obtain the image pickup screen 31, the electronic device 4 can calculate the distances between the plurality of detection base points 11 and the corneoscleral edge 22 of the eye 2 from the image pickup screen 31 to obtain the position of the focus point 12 of the eye 2 on the trial contact lens 1, further, the contact lens 5 is manufactured according to the position of the focus point 12, so that the optical center 51 on the surface of the contact lens 5 is matched with the visual axis center 23 of the eye 2, thereby correctly focusing the visual image on the retina 24 of the eye 2 without easy defocusing by measuring the distance relationship between the visual axis center 23 of the eye 2 (the focus point 12 in the fifth drawing), the center point of the cornea 21 and the optical center of the trial contact lens 1, and achieving the purpose of avoiding discomfort in viewing.
Secondly, the plurality of detection base points 11 of the contact lens 1 are arranged at the edge of the contact lens 1, which does not affect the view of the eyes 2, so that the center of the contact lens 1 can not be shielded by the object, which does not affect the view, and the user can really view the external environment, thereby improving the accuracy of detecting the focus point 12.
Thirdly, the projection device 6 can be used to form the cross coordinate mark 61 on the surface of the contact lens 1 for fitting, so that the cross coordinate mark 61 is displayed on the shot picture 31 shot by the camera device 3, and the electronic device 4 can be assisted to calculate the distance, and the inspector can also check whether the distance calculated by the electronic device 4 is correct by looking at the cross coordinate mark 61 in the shot picture 31, thereby achieving the purpose of improving the accuracy of calculating the position of the focus point 12.
Fourthly, the projection device 6 can be used to image the cross coordinate mark 61 on the surface of the try-on contact lens 1, so that the try-on contact lens 1 can be applied to various types of contact lenses without directly arranging a cross coordinate axis, and after the try-on contact lens 1 is used for detecting the focus 12, the try-on contact lens can be provided for other purposes again, so as to achieve the effects of reusability and environmental protection.
The above detailed description is of a preferred embodiment of the present invention, but the embodiment is not intended to limit the scope of the invention, and all other equivalent variations and modifications which do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for detecting a focus point of a contact lens, comprising the steps of:
(A01) firstly, wearing a try-on contact lens with a plurality of detection base points on the surface of the cornea of an eye;
(A02) shooting the eyes wearing the try-on contact lenses by using a camera device to obtain a shot picture;
(A03) calculating the distance between a plurality of detection base points and the corneoscleral edge of the eye from the shooting picture by an electronic device so as to calculate the focus position of the eye on the trial contact lens;
(A04) the contact lens is manufactured according to the focus position on the contact lens to be tried on, so that the optical center of the surface of the contact lens is in line with the visual axis center of the eye.
2. The method for detecting a focusing point of a contact lens according to claim 1, wherein the plurality of detection base points of the trial contact lens in the step (a01) are provided adjacent to the edge of the trial contact lens at positions where the eye-viewing line is not impaired, and the trial contact lens is provided with at least two or more detection base points at arbitrary positions on the edge.
3. The method for detecting a focusing point of a contact lens according to claim 1, wherein the trial contact lens in the step (a01) has four point detection base points and is disposed at four axial positions in the axial direction of the trial contact lens X, Y, the four axial positions being in the angular directions of 0 °, 90 °, 180 ° and 270 °.
4. The method of claim 1, wherein the step (A01) is followed by the steps of:
(A011) projecting and imaging a cross coordinate mark on the surface of the trial contact lens by using a projection device, wherein four ends of the cross coordinate mark are a plurality of detection base points passing through the trial contact lens.
5. The method of claim 1, wherein the step (A011) is followed by the steps of:
(A012) the eyes are irradiated by the luminous source, and the focusing projection image of the luminous source is reflected on the surface of the try-on contact lens, and the focusing projection image is the position of the focusing point of the try-on contact lens.
6. The method according to claim 1, wherein the image capturing device in step (A02) is a digital camera or a video camera, and the picture captured by the image capturing device is a photo or a movie.
7. The method for detecting a focus point of a contact lens according to claim 1, wherein the shot picture of the image pickup device in the step (a02) is a movie, so that the sliding direction, sliding speed, sliding distance or rotation amount of the contact lens to be tried on the eye can be known from the shot picture of the movie.
8. The method for detecting a focus point of a contact lens according to claim 1, wherein the electronic device in the step (a03) is electrically connected to an image capturing device, the image capturing device is capable of transmitting a captured image to the electronic device, and the electronic device is used to calculate distances between the detection base points of the contact lens for trial wearing and the corneal limbus of the eye, so as to obtain the offset distance of the contact lens for trial wearing on the corneal cornea of the eye according to the relative distance difference between the detection base points and the corneal limbus of the eye.
9. The method for detecting a focusing point of a contact lens according to claim 1, wherein the distance between the plurality of detection base points of the contact lens to be tried on and the corneoscleral edge of the eye in the step (a03) is calculated by a distance formula between two points.
10. The method of claim 1, wherein the step (A03) of calculating the focus point on the contact lens for fitting is performed according to the following steps:
(A031) the mark for identification is made at the focus point of the try-on contact lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785768.2A CN110726532A (en) | 2018-07-17 | 2018-07-17 | Focusing point detection method of contact lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810785768.2A CN110726532A (en) | 2018-07-17 | 2018-07-17 | Focusing point detection method of contact lens |
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| CN110726532A true CN110726532A (en) | 2020-01-24 |
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| CN201810785768.2A Withdrawn CN110726532A (en) | 2018-07-17 | 2018-07-17 | Focusing point detection method of contact lens |
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| CN106950716A (en) * | 2017-05-17 | 2017-07-14 | 珠海随变科技有限公司 | A kind of method and system that ophthalmic len number of degrees measurement is carried out by mobile phone photograph |
| CN107890336A (en) * | 2017-12-05 | 2018-04-10 | 中南大学 | Diopter detecting system based on intelligent handheld device |
| CN108227239A (en) * | 2016-12-15 | 2018-06-29 | 索尼移动通讯有限公司 | Intelligent invisible glasses and the multimedia system for including the intelligent invisible glasses |
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| US3836772A (en) * | 1973-07-18 | 1974-09-17 | Honeywell Inc | Detecting apparatus for determining when image is in focus |
| US4189218A (en) * | 1976-06-01 | 1980-02-19 | Konishiroku Photo Industry Co., Ltd. | Apparatus for detecting focal point |
| CN102068236A (en) * | 2010-12-17 | 2011-05-25 | 中国科学院光电技术研究所 | Line-scanning confocal ophthalmoscope system based on laser diffraction and method |
| CN103431840A (en) * | 2013-07-31 | 2013-12-11 | 北京智谷睿拓技术服务有限公司 | System and method for detecting optical parameters of eyes |
| CN105301802A (en) * | 2014-06-12 | 2016-02-03 | 嘉盛联合股份有限公司 | Focus point detection of contact lenses and contact lenses capable of being tried on |
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Application publication date: 20200124 |