Lens image generation system and refractive power and thickness determination and defect detection method

Abstract

The present disclosure relates to a lens image producing system and a power and thickness determination and defect detection method. A system for producing high-contrast images of an ophthalmic lens under examination includes a top camera that views the ophthalmic lens through a lens module; a motorized mechanism that positions the top camera at two preprogrammed positions; three illumination modules; the illumination modules focus light through the ophthalmic lens under examination to produce high-contrast images of features of the ophthalmic lens; wherein the ophthalmic lens is contained within a cell having a power of +10; the cell is fitted with two optical windows; the cell has a transparent bottom glass that is suitably designed to position the ophthalmic lens under examination; the cell is designed to be filled with a saline solution; a precisely calibrated test object that is positioned to achieve superimposition of an image of the ophthalmic lens with a pattern present on the test object; an additional illumination source comprising a laser diode; and a second camera that views the ophthalmic lens through a tilted optical lens module.

Description

[0001] This application is a divisional application of the invention patent application filed on April 18, 2019, with application number "201910313238.2" and invention title "Lens Image Generation System and Method for Determining Refractive Power and Thickness and Detecting Defects". Technical Field

[0002] This invention relates to an apparatus and method for measuring the refractive power of ophthalmic lenses. More specifically, this invention relates to an apparatus and method for measuring the refractive power of contact lenses, which can be suitably integrated into automated manufacturing systems. Background Technology

[0003] Many existing measurement systems exist that measure the refractive power and other properties of ophthalmic lenses at localized points. Commercially available instruments for performing refractive power measurements use a probe beam combined with dynamic positioning to measure the lens's refractive power. However, these instruments cannot be integrated into high-speed automated manufacturing systems because inspecting each lens requires time, making them unsuitable for such purposes. Ophthalmic lenses are manufactured to accommodate different types of eye characteristics. Lenses need to be appropriately classified and separated according to their refractive power before allocation.

[0004] In view of the above, there is a need for an automated system or apparatus and method for accurately and reliably measuring the refractive power of a lens within fractions of a second, so that the apparatus can be integrated into an automated manufacturing system. Summary of the Invention

[0005] To achieve this objective, embodiments of the present invention include: a high-resolution imaging device for capturing images of a contact lens; a positioning mechanism for moving a camera to a first position using a motor mechanism; and a light head based on a test object LED that can effectively illuminate a glass target and capture an image of the glass target as seen through an empty small pool filled with a salt solution.

[0006] The object of this invention is to provide an apparatus and method for inspecting the refractive power of a contact lens. The process begins by moving a top camera to a first position and capturing an image of a test subject through a contact lens with zero refractive power and a small pool filled with a saline solution. This image is then used as a reference image. Subsequently, calibration of the top camera 14 is performed using the reference image by measuring the distances between adjacent points, preferably in the X, Y, and Z directions, using a set of software algorithms and tabulating the measured distances; a contact lens with refractive power is loaded into the small pool; the test subject's optical head is made to illuminate the lens under inspection and capture an image of the glass target seen through the contact lens suspended in the saline solution; the distances between all adjacent points in the X, Y, and Z directions within the optical region are measured; the refractive power of the lens is determined using the distance values; and a display means is provided for displaying and notifying the results determined by the software program. The results can also be transmitted electronically to enable integration with third-party devices.

[0007] Another object of the present invention is to provide an apparatus and method for inspecting defects (such as cracks, cuts, voids, bubbles, mold overflow, and foreign matter) within a contact lens, comprising: a high-resolution imaging device for capturing images of the contact lens; a positioning mechanism for moving a camera to a second position using a motorized mechanism; enabling multiple illumination modules to effectively highlight various defects in the contact lens at different times; capturing multiple images under different illumination conditions; using multiple sets of software algorithms to analyze the images to detect and identify defective contact lenses; and transmitting the inspection results to a host machine to remove the defective lens.

[0008] Another object of the present invention is to provide an apparatus and method for inspecting the thickness of a contact lens, comprising: a second high-resolution imaging device mounted at an angle to the contact lens being inspected; enabling a laser diode-based illumination module; capturing an image of the contact lens using a second camera; analyzing the image using a set of independent algorithms to measure the thickness of the lens; and transmitting the inspection results to a host machine for further steps, such as separating lenses of different thicknesses. Attached Figure Description

[0009] A full understanding of the invention can be obtained by considering the following detailed description in conjunction with the accompanying drawings, in which:

[0010] Figure 1A preferred embodiment of a first aspect of the invention is illustrated graphically, which is an apparatus for measuring the refractive power of an ophthalmic lens, identifying defects (e.g., cuts, cracks, voids, bubbles, mold overflow, and foreign matter) and thickness of the lens. The apparatus comprises three distinct sections 100, 200, and 300. Module 100 includes a camera and an objective lens; module 200 includes a complex illumination module and necessary lenses and prisms for guiding and focusing illumination toward the contact lens; and module 300 is a specially designed pool containing the contact lens being examined and two optical windows allowing a vertical camera and a tilting camera to observe and capture images of the contact lens; the specially designed pool is filled with a saline solution.

[0011] Figure 2 A sample of a calibration target based on precision glass, available from any optical component supplier, is shown.

[0012] Figure 3 An enlarged view of the area enclosed by frame 41 in the precision glass target is shown. The distance between a pair of points and the diameter of each adjacent point are measured and stored as calibration data;

[0013] Figure 4 An illustration shows an image of a precision target object captured by a contact lens with zero refractive power in a small pool filled with a salt solution.

[0014] Figure 4a It shows the result of Figure 4 A magnified view of the area enclosed by the box in the image;

[0015] Figure 5 An illustration shows an image of a precision target object as seen through a positive refractive power contact lens located in a small pool filled with a salt solution;

[0016] Figure 5a It shows the result of Figure 5 A magnified view of the area enclosed by the box in the image;

[0017] Figure 6 An illustration shows an image of a precision target object as seen through a negative refractive power contact lens located in a small pool filled with a salt solution;

[0018] Figure 6a It shows the result of Figure 6 A magnified view of the area enclosed by the box in the image;

[0019] Figure 7 The illustration shows three adjacent points of a positive refractive power lens and three adjacent points of a negative refractive power lens superimposed on three adjacent points of a glass target.

[0020] Figure 8 A graph is shown showing the relationship between the refractive power of a contact lens and the distance between two selected points within the optical region of the contact lens with refractive power.

[0021] Figure 9 From Figure 1 The diagram shows the subsystem extracted from the image, which is used to measure the thickness of the contact lens.

[0022] Figure 10 It was done without contacting the lens in the small pool. Figure 9 The camera 20 observed by Figure 1 An image of the laser beam emitted by the laser diode optical head 47.

[0023] Figure 11 This is achieved when a thin contact lens is present in the small pool. Figure 9 The camera 20 observed by Figure 1 An image of the laser beam emitted by the laser diode optical head 47.

[0024] Figure 12 This is achieved when a thicker contact lens is present in the small pool. Figure 9 The camera 20 observed by Figure 1 An image of the laser beam emitted by the laser diode optical head 47.

[0025] Figure 13 It is used in measurement Figure 11 The scattered laser beam Y1 and Figure 12 The thickness of the contact lens is calculated by referring to a diagram after determining the length of the scattered laser beam Y2. Detailed Implementation

[0026] Figure 1 An embodiment of the first aspect of the invention is illustrated graphically, which is an apparatus for measuring the refractive power, thickness, and various other defects (e.g., bubbles, scratches, contaminants, and edge defects) of a contact lens. This embodiment consists of two main parts.

[0027] The first part is as follows. The camera and lens module 100 consists of a top camera 14, which is vertically mounted and driven by a motor mechanism 10 to position the camera 14 at different positions 11 and 12 on the vertical axis. The camera 14 is suitably integrated into the lens module 16. A second camera 20, mounted at an angle, is suitably integrated into the lens module 22. A flat window 18 and a side-angled window 24 allow images of the contact lens 30 to be captured by the cameras 14 and 20, respectively. The first position 12 of the camera 14 is preferably used to inspect the refractive power of the contact lens, and the second position 11 of the camera 14 is preferably used to inspect for defects (e.g., bubbles, scratches, contaminants, and edge defects).

[0028] Part 200 is a complex lighting module, and includes several lighting modules used in various combinations to illuminate certain specific defects in the contact lens.

[0029] The illumination module 44 can only be used for measuring refractive power with the test object 43 and for calibrating the inspection system. Beam splitters 41 and 42 direct bright-field illumination from 49 toward the contact lens 30, which is suspended in a salt solution in the pool 32 and properly positioned on the bottom glass 35. Beam splitters 41 and 42 also direct illumination from the test object illumination module 44 toward the contact lens 30, which is suspended in a salt solution in the pool 32 and properly positioned on the bottom glass 35. The test object 43 is positioned between the target object illumination module 44 and the beam splitter 42 so that the top camera 14 can capture an image of the test object. The test object is preferably embossed with an image such as... Figure 2 A precision glass object with a pattern of precisely sized dots. Figure 2 The test objects shown are typical glass targets available from many optical component suppliers, and Figure 3 It shows the embossing on Figure 2 A magnified representation of two adjacent points on a glass object. Glass object 43 may have several types. Figure 2 One type is shown in the diagram. Lens 40 is used as a focusing lens to focus all the light toward the pool.

[0030] Illumination modules 46, 48, and 49 are used individually or in a predetermined combination to enhance the appearance of defects within the contact lens, such as cracks, cuts, voids, bubbles, mold overflow, and foreign matter. Beam splitters 45 and 41 guide the light emitted by illumination modules 46, 48, and 49 toward the contact lens 30, and beam splitters 42 and 41 guide the light emitted by modules 47 and 44 toward the contact lens 30, wherein the contact lens 30 is properly positioned on the bottom glass 35.

[0031] The third part 300 is a contact lens pool 32, in which the contact lens 30 to be inspected is positioned. The pool 32 is filled with saline solution, and the contact lens 30, which is properly positioned on the bottom glass 35, is placed in the saline solution 37. The container also includes a flat window 18 and a slanted window 24 for cameras 14 and 20, respectively.

[0032] The function of each of the first part 100, the second part 200, and the third part 300 is to allow each part to be used independently with different devices. Furthermore, although the thickness measurement and refractive power measurement are described herein as operating together to form the first part 100, both can be used with other devices. Therefore, various aspects of the invention include the following:

[0033] • Refractive power measurement and defect detection system (14, 16, 18);

[0034] • Thickness measurement system (20, 22, 24);

[0035] • Glass target 43, and;

[0036] Lighting module 200.

[0037] The above-described components can be used as standalone parts in other applications, or in various combinations or together as functional components, as described herein.

[0038] The method for testing refractive power relies on the average distance between a set of pre-selected points in the captured images of different contact lenses with varying refractive powers. To enable the measurement of lenses with negative refractive power, the pool is designed to have a refractive power greater than zero by 10; therefore, any contact lens with a refractive power ranging from -10 to +10 can be measured. A dot was chosen as the test object because it allows for the measurement of the image center position of such an object, even in cases of significant defocus.

[0039] The illumination modules used for inspecting contact lens defects (e.g., cracks, cuts, voids, bubbles, mold overflow, and foreign matter) are a bright field illuminator 49, a dark field illuminator 46, and a single-point illuminator 48. The laser diode illuminator 47 can only be used to measure the thickness of the contact lens.

[0040] The single-point illumination from 48 is directed by beam splitters 45 and 41 toward a contact lens 30 suspended in a salt solution within a small pool 32. Lens 40 is used to focus all the different illuminations toward the pool. Laser diode illumination 47 is used to measure the thickness of the contact lens.

[0041] Figure 2A sample of glass target 43 is shown, wherein the glass target has several points precisely imprinted on a precision glass target. The glass target and the imprinted pattern can be changed according to the requirements of the inspection characteristics.

[0042] Figure 3 It shows Figure 2 A magnified view of two printed points 56 on target 43. During calibration, images of lenses with known refractive power are used to capture the image, and the average distance across a pre-selected group of points is plotted to obtain... Figure 8 The chart in the image.

[0043] Figure 4 An image of a glass target is shown, captured by a top camera 14 located in a first position and a contact lens with zero refractive power mounted in a small pool. Figure 4a yes Figure 4 A magnified image of the frame in the image. Measure and store the distance 60 between the centers of points d1 and d2 in the table. Repeat this process for a group of 18 to 20 points selected from the optical region 65. The pre-selected point groups (determined during calibration) are adjacent to each other and may be in the horizontal, vertical, or angular direction, as long as the pre-selected point group falls within the optical region 65. Figure 5 yes Figure 1 An image of the same target glass 43, captured using a contact lens with positive refractive power placed in a small pool and a top camera 14 in a first position. Figure 5a yes Figure 5 A magnified image of the frame in the image. The process of measuring the distance 70 between two adjacent points d3 and d4 is performed, and this process is repeated for a pre-selected group of points (determined during calibration) located within the optical region of the contact lens, and the results are tabulated.

[0044] Figure 6 yes Figure 1 An image of the same target glass 43, captured using a contact lens with negative refractive power placed in a small pool and a top camera 14 in a first position. Figure 6a yes Figure 6 A magnified image of the frame in the image. The process of measuring the distance 80 between two adjacent points d5 and d6 is performed, and this process is repeated for a pre-selected group of points (determined during calibration) located within the optical region of the contact lens, and the results are tabulated.

[0045] Figure 7 It is a measurement Figure 4 , Figure 5 and Figure 6 The diagram illustrates a graphical representation of the refractive power of different contact lenses. For ease of understanding, Figure 7 The attached diagram shows three points, but more points can be used to measure distances. x1 and x2 refer to the distance from... Figure 4 The distance between the three selected points, where Figure 4 This represents the image of a glass target in a small pool without a contact lens. y1 and y2 refer to the image from... Figure 5 The distance between the three selected points, where Figure 5 This represents the image of a glass target with a positive refractive power contact lens mounted in a small pool. z1 and z2 refer to the image from... Figure 6 The distance between the three selected points, where Figure 6 This represents the image of a glass target with a negative refractive power contact lens mounted in a small pool. Taking the average of x1 and x2, y1 and y2, and z1 and z2 will yield x, y, and z.

[0046] Plot the distances x, y, and z and use Figure 8 The calibration chart is used to determine the refractive power of the contact lens being examined. The results are then relayed to the integrated system for further action.

[0047] Any changes to the basic configuration of the inspection device will require a recalibration process to obtain results such as... Figure 8 A new calibration diagram is generated from the calibration diagram in the system. Changes may include, but are not limited to, changes or modifications to the position of the focal point, the type of salt solution, the position of any optical element of the inspection system, such as changes or modifications to the camera resolution, camera position, camera lens, pool material or its configuration, glass target configuration, illumination intensity, illumination mode, glass target position, prism configuration or position, and any combination thereof.

[0048] exist Figure 9 middle, Figure 1 The illustrated subsystem highlights the module used to measure the thickness of the contact lens. This subsystem comprises a camera 20 suitably integrated into the optical lens 22 and the oblique window 24. The camera 20 captures images of the contact lens 30, which is suspended in a salt solution in a small pool 32 and suitably positioned on the bottom glass 35. The contact lens 30 is illuminated by a laser beam 39, which is... Figure 1 The laser diode illumination module 47 emits light, and is subsequently emitted by, for example, the laser diode illumination module 47. Figure 1 The beam splitters 42 and 41 are shown. The principle of thickness measurement relies on laser 39, which is guided by the contact lens material and Figure 9 The surfaces 33 and 34 of the contact lens, as indicated in the diagram, scatter light. For ease of understanding, in... Figure 9 The image shows a single ray scattered from the two surfaces of the contact lens. When laser beam 39 is incident on... Figure 9When the laser beam is applied to the contact lens 30, it is scattered in different directions. The scattering of the laser is proportional to the thickness of the contact lens. The distance 38 between the measured scattered beams 36 and 37 represents a proportional value to the thickness of the contact lens 30. Clearly, the smaller the distance 38, the smaller the thickness of the contact lens. The distance 38 is shown as follows: Figure 11 and Figure 12 Y1 and Y2 are shown in pixels. A relatively high distance of 38 indicates a thicker contact lens. This creates an image showing... Figure 9 Pre-configured chart of proportional thickness values ​​in the distance 38 Figure 13 And subsequently Figure 13 Used to determine the thickness value of the contact lens being inspected. For calibration purposes, in Figure 10 The image shown is of an empty small pool (without contact lenses). The graph was created by capturing images of n contact lenses with known thickness values ​​and then measuring distances Y1, Y2…Yn in the captured images. Then, values ​​Y1, Y2…Yn are used to create graphs such as those in… Figure 13 The chart shown is a graph of the diagram. The refractive index of the salt solution and the effect of the small pool were considered during the creation of the table to determine the thickness of the contact lens. Any changes to the liquid or refractive power of the small pool retainer will necessitate the creation of a chart as shown. Figure 13 A new calibration chart as described in the figure. Due to the low divergence characteristics of the laser beam, Figure 9 The distance 38 in the middle is converted into a fairly accurate value for the thickness of the contact lens.

[0049] This disclosure also includes the following technical solutions:

[0050] Solution 1. A system for generating a high-contrast image of an ophthalmic lens under examination, comprising:

[0051] A top-mounted camera observes the ophthalmic lens through a lens module;

[0052] A motor mechanism for positioning the top camera at two pre-programmed positions;

[0053] Three lighting modules;

[0054] The illumination module focuses the light passing through the ophthalmic lens being examined, thereby producing a high-contrast image of the features of the ophthalmic lens;

[0055] The ophthalmic lens is contained within a small pool with a refractive power of +10.

[0056] The small pool is equipped with two optical windows, one of which is vertical and the other is at an angle;

[0057] The pool has a transparent bottom glass that is appropriately designed to position the ophthalmic lens being examined.

[0058] The small pool is designed to be filled with a salt solution;

[0059] A precisely calibrated test object, which is positioned to achieve an image of the ophthalmic lens superimposed on an image of a pattern present on the test object;

[0060] Additional lighting sources, including laser diodes; and

[0061] A second camera observes the ophthalmic lens through a tilted optical lens module.

[0062] Option 2. The system according to Option 1 further includes a focusing lens.

[0063] Option 3. The system according to Option 1 further includes a beam splitter.

[0064] Option 4. A method for determining the refractive power of an ophthalmic lens, the method comprising the following steps:

[0065] Move the top camera to the first position;

[0066] An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of the top camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid.

[0067] A set of illumination sources and a top camera are provided, the top camera being used to receive illumination through a calibration target and subsequently through an ophthalmic lens contained in the examination pool to produce a superimposed image;

[0068] Provided is an examination pool designed with a refractive power of +10, the examination pool comprising an optically transparent bottom and containing the liquid, wherein an ophthalmic lens with a refractive power of 0 is positioned at the center of the bottom glass; and

[0069] The distances between several predetermined target points representing the refractive power of a reference ophthalmic lens are measured and the measurement results are tabulated.

[0070] Option 5. The method described in Option 4 further includes the following steps:

[0071] Move the top camera to the first position;

[0072] An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of the top camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid.

[0073] A set of illumination sources and a top camera are provided, the top camera being used to receive illumination through a calibration target and subsequently through the ophthalmic lens contained in the examination pool to produce a superimposed image;

[0074] An examination chamber designed with a refractive power of +10 is provided, the examination chamber comprising an optically clear bottom glass and containing the liquid, wherein an ophthalmic lens with a refractive power of 0 is positioned at the center of the bottom glass; and

[0075] A calibration chart of pixel-based measurements between predetermined target point groups is created using several pre-selected ophthalmic lenses with known refractive power.

[0076] Option 6. The method described in Option 5 further includes the following steps:

[0077] Move the top camera to the first position;

[0078] An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of the top camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid.

[0079] A set of illumination sources and a top camera are provided, the top camera being used to receive illumination through the calibration target and subsequently through an ophthalmic lens contained in the examination pool to produce a superimposed image;

[0080] Measure the distance between several predetermined target point groups and determine the refractive power according to a calibration chart; and

[0081] The ophthalmic lens is removed and separated based on its refractive power.

[0082] Option 7. A method for inspecting defects in ophthalmic lenses, the method comprising the following steps:

[0083] Move the top camera to the second position;

[0084] An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of the top camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid.

[0085] A separate group of illumination sources and a top camera are provided, the top camera being used to receive illumination through an ophthalmic lens contained in the examination pool to produce multiple enhanced images of the defect in the ophthalmic lens;

[0086] Inspect the ophthalmic lens for defects such as scratches, cracks, and bubbles; and

[0087] If the size of the defect detected in the ophthalmic lens exceeds a predetermined size, the lens is removed.

[0088] Option 8. A method for determining the thickness of an ophthalmic lens, the method comprising the following steps:

[0089] An examination pool is provided with a refractive power of +10 and the examination pool is positioned on the optical axis of a top camera. The examination pool includes an optically clear bottom glass designed to have a refractive power of +10 and the optically clear bottom glass has a concave inner surface containing the ophthalmic lens immersed in a liquid.

[0090] A single laser illumination source and a second camera are provided, the second camera being used to receive illumination guided by a set of beam deflectors and passed through a focusing lens and an ophthalmic lens contained in the examination pool to produce a laser beam scattering image formed by reflected rays, and to measure the distance between the two extremes of the reflected rays.

[0091] Option 9. The method according to Option 8 further includes the following steps:

[0092] An examination pool is provided with a refractive power of +10 and the examination pool is positioned on the optical axis of an imaging module. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid.

[0093] A single laser illumination source and a second camera are provided. The second camera receives illumination guided by a set of beam deflectors and passed through a focusing lens and an ophthalmic lens contained in the examination pool to produce an image of laser beam scattering formed by reflected rays, and measures the distance between the two extremes of the reflected rays; and

[0094] Create a graph (thickness relative to length in pixels) of the measurements between the two extremes of the scattered laser beams from several pre-selected lenses with known thicknesses, to be used as a reference for determining the lens thickness of the ophthalmic lens to be examined subsequently.

[0095] Option 10. The method according to Option 9 further includes the following steps:

[0096] An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of a second camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid.

[0097] A single laser illumination source and a second camera are provided, the second camera being used to receive illumination guided by a set of beam deflectors and passed through a focusing lens and an ophthalmic lens contained in the examination pool filled with the liquid to produce an image of laser beam scattering formed by reflected rays, and to measure the distance between the two extremes of the reflected rays; and

[0098] After determining the optical thickness of the lens being examined, the ophthalmic lens is removed and separated from the pool based on the plotted graph of thickness relative to length in pixels.

[0099] Those skilled in the art can make many modifications and variations to the invention without departing from its spirit and scope. The embodiments described herein are provided as examples only and should not be construed as limiting the scope of the invention.

Claims

1. A system for generating a high-contrast image of an ophthalmic lens being examined, comprising: A top-mounted camera observes the ophthalmic lens through a lens module; A motor mechanism for positioning the top camera at two pre-programmed positions; Three lighting modules; The illumination module focuses the light passing through the ophthalmic lens being examined, thereby producing a high-contrast image of the features of the ophthalmic lens; The ophthalmic lens is contained within a small pool with a refractive power of +10. The small pool is equipped with two optical windows, one of which is vertical and the other is at an angle; The pool has a transparent bottom glass that is appropriately designed to position the ophthalmic lens being examined. The small pool is designed to be filled with a salt solution; A precisely calibrated test object, which is positioned to achieve an image of the ophthalmic lens superimposed on an image of a pattern present on the test object; Additional lighting sources, including laser diodes; and A second camera observes the ophthalmic lens through a tilted optical lens module.

2. The system according to claim 1 further includes a focusing lens.

3. The system according to claim 1 further includes a beam splitter.

4. A method for inspecting defects in ophthalmic lenses, the method comprising the following steps: Move the top camera to the second position; An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of the top camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid. Provides a separate group of illumination sources configured to illuminate the ophthalmic lens, wherein the separate group of illumination sources includes a bright field illuminator, a dark field illuminator, and a single point illuminator; The bright field illuminator, the dark field illuminator, and the single-point illuminator are activated at different times; The top camera receives illumination from the independent group of illumination sources, passing through the ophthalmic lens contained in the examination pool, to generate multiple enhanced images of the defect in the ophthalmic lens; Inspect the ophthalmic lens for defects; as well as If the size of the defect detected in the ophthalmic lens exceeds a predetermined size, the lens is removed.

5. A method for determining the thickness of an ophthalmic lens, the method comprising the following steps: An examination pool is provided with a refractive power of +10 and the examination pool is positioned on the optical axis of a top camera. The examination pool includes an optically clear bottom glass designed to have a refractive power of +10 and the optically clear bottom glass has a concave inner surface containing the ophthalmic lens immersed in a liquid. A single laser illumination source and a second camera are provided, the second camera being used to receive illumination guided by a set of beam deflectors and passed through a focusing lens and an ophthalmic lens contained in the examination pool to produce a laser beam scattering image formed by reflected rays, and to measure the distance between the two extremes of the reflected rays.

6. The method according to claim 5, further comprising the following step: An examination pool is provided with a refractive power of +10 and the examination pool is positioned on the optical axis of an imaging module. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid. A single laser illumination source and a second camera are provided, the second camera being used to receive illumination guided by a set of beam deflectors and passed through a focusing lens and an ophthalmic lens contained in the examination pool to produce a laser beam scattering image formed by reflected rays, and to measure the distance between the two extremes of the reflected rays; as well as A graph is created showing the measurements between the two extremes of the scattered laser beam from several pre-selected lenses of known thickness, to be used as a reference for determining the lens thickness of the ophthalmic lens to be examined subsequently.

7. The method according to claim 6, further comprising the following step: An examination pool with a refractive power of +10 is provided and the examination pool is positioned on the optical axis of a second camera. The examination pool includes an optically transparent bottom glass with a concave inner surface, the concave inner surface containing the ophthalmic lens immersed in a liquid. A single laser illumination source and a second camera are provided, the second camera being used to receive illumination guided by a set of beam deflectors and passed through a focusing lens and an ophthalmic lens contained in the examination pool filled with the liquid to produce a laser beam scattering image formed by reflected rays, and to measure the distance between the two extremes of the reflected rays; as well as After determining the optical thickness of the lens being examined, the ophthalmic lens is removed and separated from the pool based on the plotted graph of thickness relative to length in pixels.

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