CN112987225A - Lens and refractometer of adjustable magnification degree - Google Patents
Lens and refractometer of adjustable magnification degree Download PDFInfo
- Publication number
- CN112987225A CN112987225A CN202110347931.9A CN202110347931A CN112987225A CN 112987225 A CN112987225 A CN 112987225A CN 202110347931 A CN202110347931 A CN 202110347931A CN 112987225 A CN112987225 A CN 112987225A
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- Prior art keywords
- spherical mirror
- lens
- optical
- magnification
- optical lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/103—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining refraction, e.g. refractometers, skiascopes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biophysics (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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- Animal Behavior & Ethology (AREA)
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- Lens Barrels (AREA)
Abstract
The utility model discloses a camera lens of adjustable magnification degree, including the shell that is used for placing the lens, compare with prior art, still include: an optical lens disposed within the housing; an outer convex spherical mirror and an inner concave spherical mirror are arranged on the optical lens; and the adjusting device is connected with the optical lens and used for controlling the movement of the optical lens relative to the shell. Compared with the prior art, the technical scheme of the invention can change the magnification degree of the lens within a certain degree range without replacing the lens, thereby improving the detection working efficiency.
Description
Technical Field
The application relates to the technical field of optometry lenses, in particular to a lens with adjustable amplification degree and an optometry instrument.
Background
Optometry is the main method for determining ametropia, and the degree of vergence difference between the examined eye and the emmetropic eye is measured, which occupies a considerable amount of work in clinical work. At present, the refractometer is mostly adopted in clinical work for the degree of ametropia, and the application principle is as follows: the infrared light source and the automatic fog device are adopted to achieve the purpose of relaxing eyeball adjustment, and the photoelectric technology is adopted to check diopter, so that the general condition of ametropia can be quickly measured.
At present, when most optometry instruments carry out diopter detection, the spherical lenses with various specifications and different magnification degrees need to be used for carrying out testing processes such as fog, preliminary examination, red-green balance, degree measurement, balance adjustment, binocular vision fusion and the like, the spherical lenses need to be continuously replaced according to different detection requirements in the process, the process operation is complex, professional ophthalmologists are often required to guide, and the detection efficiency is seriously influenced.
Therefore, it is an urgent technical problem for those skilled in the art to provide a lens and an optometry apparatus capable of adjusting the magnification degree, which can change the magnification degree of the lens within a certain degree range without replacing the lens, thereby improving the detection efficiency.
Disclosure of Invention
In order to solve the technical problem, the application provides a lens and refractometer of adjustable magnification degree, and it can be in certain number of degrees within range, need not to change the magnification degree of lens alright change lens, improves the work efficiency who detects.
The technical scheme provided by the application is as follows:
the application provides a camera lens of adjustable power of magnifying includes: housing for housing a lens: an optical lens disposed within the housing; the optical lens is provided with an outer convex spherical mirror and an inner concave spherical mirror; and the adjusting device is connected with the optical lens and used for controlling the movement of the optical lens relative to the shell.
Further, in a preferred mode of the present invention, the optical lens includes: a first optical spherical mirror arranged in the shell, wherein one side surface of the first optical spherical mirror is provided with the convex spherical mirror and the concave spherical mirror, and the other opposite side surface is a plane mirror; a second optical spherical mirror disposed opposite the first optical spherical mirror.
Further, in a preferred aspect of the present invention, the first optical spherical mirror and the second optical spherical mirror have the same structure and are symmetric with respect to the center; the first optical spherical mirror and the second optical spherical mirror are both connected with the adjusting device, and the relative movement directions of the first optical spherical mirror and the second optical spherical mirror are opposite.
Further, in a preferred mode of the present invention, the optical lens further includes: a third optical spherical mirror disposed within the housing; and the convex spherical mirror and the concave spherical mirror are arranged on one group of opposite side surfaces of the third optical spherical mirror.
Further, in a preferred mode of the present invention, the adjusting means includes: the guiding and moving mechanism is connected with the optical lens; the transmission mechanism is connected with the guide and moving mechanism; the adjusting control mechanism is arranged on the shell and connected with the transmission mechanism; and the displacement slide rail is connected with the guide and movement mechanism and used for placing the optical lens.
Further, in a preferred mode of the present invention, the transmission mechanism includes a transmission screw; the adjustment control mechanism comprises an adjustment knob.
Further, in a preferred aspect of the present invention, the guide and shift mechanism includes: the first sliding block is connected with the first optical spherical mirror, and the first threaded guide rail groove is arranged on the first sliding block; and the second sliding block is connected with the second optical spherical mirror and is arranged on a second thread guide rail groove on the second sliding block.
Further, in a preferred mode of the present invention, the first threaded guide rail groove and the second threaded guide rail groove are both in threaded connection with the transmission screw rod; the screw thread turning direction of the first screw thread guide rail groove is opposite to that of the second screw thread guide rail groove, and the screw pitches are the same.
Further, in a preferred aspect of the present invention, the guide and shift mechanism further includes: a third slider connected to the third optical spherical mirror; and the threaded through hole is formed in the third sliding block and connected with the transmission screw rod.
The application provides an refractometer of adjustable magnification degree, including wearing part, light-blocking part, lens part and display, the lens part adopts above the camera lens of adjustable magnification degree.
Compared with the prior art, the lens capable of adjusting the amplification degree provided by the invention comprises the following components: housing for housing a lens: an optical lens disposed within the housing; the optical lens is provided with an outer convex spherical mirror and an inner concave spherical mirror; and the adjusting device is connected with the optical lens and used for controlling the movement of the optical lens relative to the shell. Wherein, the optical lens is arranged in the shell, and the adjusting device is used for changing the position of the optical lens relative to the shell, so that the positions of the outer convex spherical mirror and the inner concave spherical mirror relative to the tested eye are changed, and the tested eye can directly look at different parts of the optical lens; when directly seeing the object by the eyes for the convex spherical mirror time, the camera lens has positive magnification, when directly seeing the object by the eyes for the concave spherical mirror time, the camera lens has negative magnification, through changing optical lens's position, makes the camera lens have different magnifications, and then makes the magnification of camera lens change. Compared with the prior art, the technical scheme of the invention can change the magnification degree of the lens within a certain degree range without replacing the lens, thereby improving the detection working efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a front view of a lens capable of adjusting magnification according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first optical spherical mirror according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second optical spherical mirror according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a third optical spherical mirror according to an embodiment of the present invention;
fig. 5 is a cross-sectional view of a first optical spherical mirror and a second optical spherical mirror according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a third optical spherical mirror in accordance with an embodiment of the present invention;
fig. 7 is a schematic view illustrating a process of changing a magnification of a lens according to an embodiment of the present invention.
Description of reference numerals:
a housing 1; an optical lens 2; a convex spherical mirror 201; an inwardly concave spherical mirror 202; an adjusting device 3; a first optical spherical mirror 4; a plane mirror 5; a second optical spherical mirror 6; a third optical spherical mirror 7; a guide and shift mechanism 8; a first slider 801; a first threaded guide track groove 802; a second slider 803; a second threaded guide track groove 804; a third slider 805; a threaded through bore 806; a transmission mechanism 9; a transmission screw 901; a displacement slide rail 10; an adjustment control mechanism 11; the knob 1101 is adjusted.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
As shown in fig. 1 to 7, a lens capable of adjusting a magnification degree according to an embodiment of the present application includes: an optical lens 2 disposed in the housing 1; the optical lens 2 is provided with a convex spherical mirror 201 and a concave spherical mirror 202; and an adjusting device 3 connected with the optical lens 2 and used for controlling the movement of the optical lens 2 relative to the shell 1.
The invention provides a lens capable of adjusting magnification degree, which specifically comprises: an optical lens 2 disposed in the housing 1; the optical lens 2 is provided with a convex spherical mirror 201 and a concave spherical mirror 202; and an adjusting device 3 connected with the optical lens 2 and used for controlling the movement of the optical lens 2 relative to the shell 1. Wherein, the optical lens 2 is arranged in the casing 1, and the adjusting device 3 is used for changing the position of the optical lens 2 relative to the casing 1, so that the positions of the convex spherical mirror 201 and the concave spherical mirror 202 relative to the tested eye are changed, and the tested eye can directly look at different parts of the optical lens 2; when the object under test is the convex spherical mirror 201, the lens has positive magnification, and when the object under test is the concave spherical mirror 202, the lens has negative magnification, and by changing the position of the optical lens 2, the lens has different magnifications, so that the magnification of the lens is changed. Compared with the prior art, the technical scheme of the invention can change the magnification degree of the lens within a certain degree range without replacing the lens, thereby improving the detection working efficiency.
Specifically, in an embodiment of the present invention, the optical lens 2 includes: a first optical spherical mirror 4 disposed in the housing 1, wherein one side surface of the first optical spherical mirror 4 is provided with the convex spherical mirror 201 and the concave spherical mirror 202, and the other opposite side surface is a plane mirror 5; a second optical spherical mirror 6 disposed opposite to the first optical spherical mirror 4.
In particular, in an embodiment of the present invention, the first optical spherical mirror 4 and the second optical spherical mirror 6 are identical in structure, and are centrosymmetric; the first optical spherical mirror 4 and the second optical spherical mirror 6 are both connected with the adjusting device 3, and the relative movement directions of the two are opposite.
Wherein the first optical spherical mirror 4 and the second optical spherical mirror 6 are controlled to move by the adjustment device 3; when the center superposition parts of the first optical spherical mirror 4 and the second optical spherical mirror 6 are different, the lenses have different amplification degrees; the central overlapping part is the visual range of the detection of the tested eye;
when the first optical spherical mirror 4 and the second optical spherical mirror 6 are relatively overlapped, the magnification of the lens is zero;
when the center overlapped part is the convex spherical mirror 201 of the two spherical mirrors, the lens has positive magnification;
when the center superposition part is the concave spherical mirror 202 of the two spherical mirrors, the lens has negative magnification;
when the center-coinciding portion moves between the convex spherical mirror 201 and the concave spherical mirror 202, the magnification of the lens is continuously changed between positive and negative.
Specifically, in an embodiment of the present invention, the optical lens 2 further includes: a third optical spherical mirror 7 disposed within the housing 1; the convex spherical mirror 201 and the concave spherical mirror 202 are provided on a set of opposite sides of the third optical spherical mirror 7.
Specifically, in an embodiment of the present invention, a flat mirror 5 is disposed on the third optical spherical mirror 7; the convex spherical mirror 201 and the concave spherical mirror 202 on opposite sides of the third optical spherical mirror 7 are symmetrically arranged.
In particular, in an embodiment of the invention, said third optical spherical mirror 7 has an axisymmetric figure in horizontal cross section.
Specifically, in the embodiment of the present invention, the adjusting device 3 includes: a guide and shift mechanism 8 connected to the optical lens 2; the transmission mechanism 9 is connected with the guide and shift mechanism 8; the adjusting control mechanism 11 is arranged on the shell 1 and connected with the transmission mechanism 9; and a displacement slide rail 10 connected with the guide mechanism 8 and used for placing the optical lens 2.
Wherein, the optical lens 2 is connected with the displacement slide rail 10 in a sliding manner.
Specifically, in the embodiment of the present invention, the transmission mechanism 9 includes a transmission screw 901; the adjustment control mechanism 11 includes an adjustment knob 1101.
Specifically, in the embodiment of the present invention, the guide and shift mechanism 8 includes: a first slide block 801 connected to the first optical spherical mirror 4, and a first threaded guide groove 802 provided in the first slide block 801; a second slide block 803 connected to the second optical spherical mirror 6, and a second screw guide groove 804 provided in the second slide block 803.
Specifically, in the embodiment of the present invention, the number of the first slider 801 is two; the two first sliding blocks 801 are respectively disposed at the top end and the bottom end of the first optical spherical mirror 4.
Specifically, in the embodiment of the present invention, the number of the second slider 803 is two; the two second sliding blocks 803 are respectively disposed at the top end and the bottom end of the second optical spherical mirror 6.
Specifically, in the embodiment of the present invention, the first threaded guide rail groove 802 and the second threaded guide rail groove 804 are semi-arc grooves; the first threaded guide groove 802 and the second threaded guide groove 804 are disposed opposite to each other.
Specifically, in the embodiment of the present invention, the first threaded guide rail groove 802 and the second threaded guide rail groove are both in threaded connection with the transmission screw 901; the thread direction of the first thread guide groove 802 is opposite to that of the second thread guide groove 804, and the thread pitch is the same.
The first threaded guide rail groove 802 and the second threaded guide rail groove are both in threaded connection with the transmission screw 901, the thread turning directions of the two are opposite, the thread pitches of the two are the same, and when the transmission screw 901 rotates for transmission, the first sliding block 801 and the second sliding block 803 can realize relative movement in opposite displacement directions.
Specifically, in the embodiment of the present invention, the guide and shift mechanism 8 further includes: a third slider 805 connected to the third optical spherical mirror 7; and a threaded through hole 806 disposed on the third slider 805 and connected to the driving screw 901.
Specifically, in the embodiment of the present invention, the number of the third slider 805 is two; the two third sliding blocks 805 are respectively disposed at the top end and the bottom end of the third optical spherical mirror 7.
Specifically, in an embodiment of the present invention, the drive screw extends through the threaded through hole 806.
The application provides an refractometer of adjustable magnification degree, including wearing part, light-blocking part, lens part and display, the lens part adopts above the camera lens of adjustable magnification degree.
As described above, in the lens barrel capable of adjusting the magnification degree according to the embodiment of the present invention, the outward-protruding spherical mirror 201 and the inward-protruding spherical mirror 202 that are disposed on the optical lens 2 are utilized, and the adjusting device 3 is combined, the adjusting control mechanism 11 is manually controlled to transmit power to the transmission mechanism, so as to drive the optical lens 2 to move on the displacement slide rail 10, change the positions of the outward-protruding spherical mirror 201 and the inward-protruding spherical mirror 202 on the optical lens 2, and change the positions of the outward-protruding spherical mirror 201 and the inward-protruding spherical mirror 202 relative to the eye to be tested, so that the eye to be tested can directly view different parts of the optical lens 2; when the object under test is the convex spherical mirror 201, the lens has positive magnification, and when the object under test is the concave spherical mirror 202, the lens has negative magnification, and by changing the position of the optical lens 2, the lens has different magnifications, so that the magnification of the lens is changed. Compared with the prior art, the technical scheme of the invention can change the magnification degree of the lens within a certain degree range without replacing the lens, thereby improving the detection working efficiency.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A lens capable of adjusting magnification degree, comprising a shell for placing a lens, characterized by further comprising:
an optical lens disposed within the housing;
the optical lens is provided with an outer convex spherical mirror and an inner concave spherical mirror;
and the adjusting device is connected with the optical lens and used for controlling the movement of the optical lens relative to the shell.
2. The lens with adjustable magnification power according to claim 1, characterized in that the optical lens includes: a first optical spherical mirror arranged in the shell, wherein one side surface of the first optical spherical mirror is provided with the convex spherical mirror and the concave spherical mirror, and the other opposite side surface is a plane mirror; a second optical spherical mirror disposed opposite the first optical spherical mirror.
3. The lens capable of adjusting magnification according to claim 2, wherein the first optical spherical mirror and the second optical spherical mirror have the same structure and are centrosymmetric; the first optical spherical mirror and the second optical spherical mirror are both connected with the adjusting device, and the relative movement directions of the first optical spherical mirror and the second optical spherical mirror are opposite.
4. The lens with adjustable magnification power of claim 2, characterized in that the optical lens further comprises: a third optical spherical mirror disposed within the housing; and the convex spherical mirror and the concave spherical mirror are arranged on one group of opposite side surfaces of the third optical spherical mirror.
5. The lens barrel of adjustable magnification according to claim 4, characterized in that the adjusting means includes: the guiding and moving mechanism is connected with the optical lens; the transmission mechanism is connected with the guide and moving mechanism; the adjusting control mechanism is arranged on the shell and connected with the transmission mechanism; and the displacement slide rail is connected with the guide and movement mechanism and used for placing the optical lens.
6. The lens with adjustable magnification degree according to claim 5, characterized in that the transmission mechanism includes a transmission screw rod; the adjustment control mechanism comprises an adjustment knob.
7. The lens barrel of adjustable magnification according to claim 6, wherein the lead movement mechanism includes: the first sliding block is connected with the first optical spherical mirror, and the first threaded guide rail groove is arranged on the first sliding block; and the second sliding block is connected with the second optical spherical mirror and is arranged on a second thread guide rail groove on the second sliding block.
8. The lens capable of adjusting magnification according to claim 7, wherein the first threaded guide groove and the second threaded guide groove are both in threaded connection with the transmission screw rod; the screw thread turning direction of the first screw thread guide rail groove is opposite to that of the second screw thread guide rail groove, and the screw pitches are the same.
9. The lens barrel with adjustable magnification according to claim 6, wherein the lead movement mechanism further includes: a third slider connected to the third optical spherical mirror; and the threaded through hole is formed in the third sliding block and connected with the transmission screw rod.
10. An optometry unit with adjustable magnification, comprising a wearing part, a shading part, a lens part and a display, wherein the lens part adopts the optometry unit with adjustable magnification according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347931.9A CN112987225A (en) | 2021-03-31 | 2021-03-31 | Lens and refractometer of adjustable magnification degree |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347931.9A CN112987225A (en) | 2021-03-31 | 2021-03-31 | Lens and refractometer of adjustable magnification degree |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112987225A true CN112987225A (en) | 2021-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110347931.9A Pending CN112987225A (en) | 2021-03-31 | 2021-03-31 | Lens and refractometer of adjustable magnification degree |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112987225A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3305294A (en) * | 1964-12-03 | 1967-02-21 | Optical Res & Dev Corp | Two-element variable-power spherical lens |
| US20040032568A1 (en) * | 2002-08-14 | 2004-02-19 | Kabushiki Kaisha Topcon | Subjective optometric apparatus |
| CN103429140A (en) * | 2011-03-17 | 2013-12-04 | 卡尔蔡司医疗技术股份公司 | Systems and methods for refractive correction in visual field testing |
| CN107407814A (en) * | 2015-01-22 | 2017-11-28 | 奇跃公司 | The method and system of focal plane is created using Alvarez lens |
| US20180263488A1 (en) * | 2015-01-13 | 2018-09-20 | Eyenetra, Inc. | Variable Lens System for Refractive Measurement |
| US20190246894A1 (en) * | 2016-06-17 | 2019-08-15 | Essilor International | Subjective refraction apparatus |
-
2021
- 2021-03-31 CN CN202110347931.9A patent/CN112987225A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3305294A (en) * | 1964-12-03 | 1967-02-21 | Optical Res & Dev Corp | Two-element variable-power spherical lens |
| US20040032568A1 (en) * | 2002-08-14 | 2004-02-19 | Kabushiki Kaisha Topcon | Subjective optometric apparatus |
| CN103429140A (en) * | 2011-03-17 | 2013-12-04 | 卡尔蔡司医疗技术股份公司 | Systems and methods for refractive correction in visual field testing |
| US20180263488A1 (en) * | 2015-01-13 | 2018-09-20 | Eyenetra, Inc. | Variable Lens System for Refractive Measurement |
| CN107407814A (en) * | 2015-01-22 | 2017-11-28 | 奇跃公司 | The method and system of focal plane is created using Alvarez lens |
| US20190246894A1 (en) * | 2016-06-17 | 2019-08-15 | Essilor International | Subjective refraction apparatus |
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Application publication date: 20210618 |
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