Contact lenses

Abstract

The present application discloses a contact lens, which has a first area, a second area and a pattern. In a top view of the contact lens, the pattern is not mirror-symmetrical on both sides of a preset axis, and the preset axis passes through the center of the contact lens. In different azimuthal cross sections of the contact lens, the sum of the first cross-sectional area corresponding to the first area and the second cross-sectional area corresponding to the second area is a total cross-sectional area, and the ratio of the second cross-sectional area to the total cross-sectional area is different with the change of the azimuthal angle, so that when the contact lens is worn, the pattern is close to the expected position of the user's eye.

Description

Technical Field

[0001] This invention relates to a contact lens, and more particularly to a patterned contact lens. Background Technology

[0002] With the widespread availability of patterned contact lenses, users often find that the pattern is not in the expected position after wearing them, thus reducing the aesthetic appeal. In particular, this is especially true for contact lenses with asymmetrical patterns. Summary of the Invention

[0003] This invention discloses a contact lens, mainly used to improve existing contact lenses with asymmetrical patterns, which are prone to having patterns that are not in the expected position after being worn by the user, thereby reducing the aesthetics of wearing them.

[0004] One embodiment of the present invention discloses a contact lens having a first region, a second region, and a pattern. In a top view of the contact lens, the pattern is non-mirror symmetrical on both sides of a preset axis, the preset axis passing through a center of the contact lens. With the central axis of the contact lens as the center and the radius of the contact lens as the width, in a cross-sectional plane of the contact lens at different azimuth angles, the sum of a first cross-sectional area corresponding to the first region and a second cross-sectional area corresponding to the second region is a total cross-sectional area. The ratio of the second cross-sectional area to the total cross-sectional area varies with the azimuth angle, so that when the contact lens is worn, the pattern is close to a desired position of the user's eye.

[0005] Optionally, the area within a 4mm radius of the contact lens is defined as the first zone, and the remaining area is defined as the second zone.

[0006] Optionally, the pattern is formed in the second area.

[0007] Optionally, in the cross-sectional plane of the contact lens at different azimuth angles, the ratio of the second cross-sectional area to the sum of the cross-sectional areas is related to the azimuth angle by the following formula: R(θ)=P−(a*sin(k*f)+b*cos(k*f)), where θ is the azimuth angle, f is in radians, and f= |π−|θ−180 ∘ ||, 0.9 ≤ P ≤2.0, 0.01≤ a ≤ 0.2, 0.03 ≤ b ≤ 0.4, 0.8 ≤ k ≤1.5, 0≤θ≤360 ∘ .

[0008] Optionally, the difference between the ratio of the second cross-sectional area corresponding to the second region of the contact lens in a cross-sectional plane at a first angle to the sum of the cross-sectional areas and the ratio of the second cross-sectional area corresponding to the second region of the contact lens in a cross-sectional plane at a second angle to the sum of the cross-sectional areas is less than 1%, the first angle is between 1 and 179 degrees, the second angle is between 181 and 359 degrees, and the sum of the first angle and the second angle is 360 degrees.

[0009] Optionally, the ratio of the second cross-sectional area to the total cross-sectional area of ​​the second zone when the contact lens is in the 0-degree cross-sectional plane is defined as 1. Thus, the ratio of the second cross-sectional area to the total cross-sectional area of ​​the contact lens in cross-sectional planes with different azimuth angles is between 1 and 1.86.

[0010] Optionally, the contact lens has a positioning mark structure that is positioned near the intended location when the contact lens is worn.

[0011] Optionally, the manufacturing process of contact lenses includes a pad printing tip calibration procedure, which includes the following steps: a positioning pattern printing step: after dipping a pad printing tip in ink, it prints a pattern on a specific point on a positioning plate; an acquisition step: using an image acquisition device to acquire an image containing the positioning point and the pattern; and a compensation step: analyzing the acquired image to calculate a compensation value for the pad printing tip on the X-axis and Y-axis, and adjusting the position of the pad printing tip according to the compensation value on the X-axis and Y-axis.

[0012] Optionally, the manufacturing process of contact lenses also includes a mold calibration procedure, which includes the following steps: an acquisition step: using an image acquisition device to acquire a mold image of a mold; a compensation step: analyzing the mold image to calculate a compensation value for the pad printing head on the X-axis and Y-axis, and adjusting the position of the pad printing head according to the compensation value on the X-axis and Y-axis.

[0013] In summary, the contact lenses of the present invention allow the pattern to remain in the expected position after the user wears them, thereby improving the problem that existing contact lenses with asymmetrical patterns are prone to having the pattern not in the expected position after the user wears them.

[0014] To further understand the features and technical content of this invention, please refer to the following detailed description and accompanying drawings. However, these descriptions and drawings are only for illustrating the invention and are not intended to limit the scope of protection of the invention in any way. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the contact lens of the present invention.

[0016] Figure 2 This is a top view of the contact lens of the present invention.

[0017] Figure 3 This is a top view of another embodiment of the contact lens of the present invention.

[0018] Figure 4 This is a partial cross-sectional schematic diagram of the contact lens of the present invention.

[0019] Figure 5 This is a cross-sectional view of the contact lens of the present invention at a 0-degree cross-section.

[0020] Figure 6 This is a cross-sectional view of the contact lens of the present invention at a 180-degree angle.

[0021] Figure 7 A schematic diagram illustrating the process of adjusting the pad printing tip and the mold for manufacturing the contact lenses of the present invention.

[0022] Figure 8 This is a schematic diagram of the contact lens of the present invention worn on the eye.

[0023] Figure 9 This is a schematic diagram of the contact lens of the present invention worn on the eye. Detailed Implementation

[0024] In the following description, if a specific drawing is indicated or shown in a specific drawing, it is only to emphasize that most of the relevant content in the following description appears in that specific drawing, but does not limit the following description to referring only to that specific drawing.

[0025] Please refer to the following: Figures 1 to 4 , Figure 1 This is a three-dimensional schematic diagram of the contact lens of the present invention. Figure 2 This is a top view of the contact lens of the present invention. Figure 3 This is a top view of another embodiment of the contact lens of the present invention. Figure 4 This is a partial cross-sectional schematic diagram of the contact lens of the present invention.

[0026] The contact lens of the present invention includes a toric lens body 1. For ease of explanation, the toric lens body 1 is divided into a first region 11 and a second region 12. However, in reality, the first region 11 and the second region 12 are integrally formed, and the boundary between them is not visible on the contact lens 100. In practical applications, the area within a radius of 4 mm of the contact lens 100 can be defined as the first region 11, and the remaining area is defined as the second region 12. The first region 11 can be considered as the optical region, and its size can be approximately the size of a normal person's pupil. The second region 12 is generally a ring-shaped structure. In one embodiment, the optical region can be used as the area for vision correction for the user.

[0027] The toroidal lens body 1 has a pattern 2 formed in the second region 12, while the pattern 2 does not substantially obscure the first region 11. (See top view of the contact lens 100). Figure 2As shown, pattern 2 is not mirror-symmetrical on both sides of a preset axis X1, which passes through the center C of the contact lens 100. The number, shape, color, and placement of pattern 2 can all be designed according to actual needs; the figure shown is only one example.

[0028] It should be noted that, as Figure 2 As shown in the figure, although axis X2 passes through the center of contact lens 100, pattern 2 is mirror-symmetrical on both sides of axis X2. Therefore, Figure 2 The axis X2 indicated in the figure is not the preset axis described in this invention.

[0029] It should be noted that the specific position of the aforementioned preset axis X1 will change depending on the pattern 2, but all preset axes X1 will pass through the center C of the contact lens 100. For example, Figure 2 and Figure 3 The contact lenses 100 shown each have a different pattern 2, while Figure 2 and Figure 3 The two preset axes X1 and X3 are also different.

[0030] The pattern 2 and the preset axis X1 referred to in this invention are mainly used to define that the contact lens 100 has an asymmetrical pattern. Therefore, under the above conditions, the same pattern 2 can contain multiple preset axes. That is to say, in Figure 2 In addition to axis X2, if other axes pass through the center of contact lens 100 and pattern 2 is not mirror-symmetrical on both sides of the axis, then the axis can also be defined as a preset axis.

[0031] With the central axis CX of the contact lens 100 as the center and the radius of the contact lens 100 as the width D, in a cross-section of the contact lens 100 at different azimuth angles θ, the sum of a first cross-sectional area corresponding to the first region and a second cross-sectional area corresponding to the second region is a total cross-sectional area. The ratio of the second cross-sectional area to the total cross-sectional area varies with the azimuth angle θ, so that when the contact lens 100 is worn, pattern 2 can be close to a desired position of the user's eye. The desired position is, for example, the user's lower eyelid, upper eyelid, outer corner of the eye, or inner corner of the eye.

[0032] More specifically, through the design of the second cross-sectional area and the total cross-section, the weight of the area near the outer edge of the contact lens 100 is made heavier than the weight of the central area of ​​the contact lens 100, and the weight of a certain position of the contact lens 100 is made heavier than the weight of other positions. Therefore, when the contact lens 100 is worn, a portion of the contact lens 100 will naturally move closer to the user's lower eyelid. Thus, when manufacturing the contact lens 100, the relevant personnel can form the pattern 2 at a specific position on the toric lens body 1 as needed. In this way, when the contact lens 100 is worn, the pattern 2 will automatically move closer to the user's intended position on the eye.

[0033] like Figure 2 , Figure 4 , Figure 5 , Figure 6 As shown in Table 1 below, in the top view of contact lens 100, located... Figure 2 The baseline Z is parallel to Figure 2 The Y-axis in the diagram is located at... Figure 2 The baseline Z's cross-sectional planes are defined as the 0-degree cross-sectional plane P1 and the 180-degree cross-sectional plane P2, and... Figure 2 In the diagram, with baseline Z as the center, 12 cross-sectional planes are taken at 30-degree intervals clockwise. Within each cross-sectional plane, the first region corresponds to a first cross-sectional area, and the second region corresponds to a second cross-sectional area. Figure 5 The diagram shows a cross-sectional view of the contact lens 100 at the 0-degree cross-sectional plane P1. A1 and A2 are marked in the diagram as the first cross-sectional area A1 corresponding to the first region and the second cross-sectional area A2 corresponding to the second region, respectively. Figure 6 The diagram shows a cross-sectional view of contact lens 100 at a 180-degree cross-sectional plane P2. A1 and A2 are marked in the diagram as the first cross-sectional area A1 corresponding to the first region and the second cross-sectional area A2 corresponding to the second region, respectively.

[0034] The ratio of the second cross-sectional area to the sum of the cross-sectional areas (the sum of the first cross-sectional area A1 corresponding to the first region 11 and the second cross-sectional area A2 corresponding to the second region 12) of the contact lens 100 in the 12 cross-sectional planes is shown in Table 1 below.

[0035] Table 1:

[0036]

[0037] The angles in Table 1 above represent the azimuth angles corresponding to each cross-section. Therefore, as shown in Table 1, the ratio corresponding to contact lens 100 in the 0-degree cross-section P1 is 1.400, while the ratio corresponding to contact lens 100 in the 180-degree cross-section P2 is 2.600, with the largest ratio corresponding to contact lens 100 in the 180-degree cross-section P2. The ratios corresponding to contact lens 100 in cross-sections from 1 to 179 degrees range from 1.400 to 2.600, and the ratios corresponding to contact lens 100 in cross-sections from 181 to 359 degrees also range from 2.600 to 1.400. Specifically, in cross-sections closer to the 0-degree cross-section P1, the ratio of the second cross-sectional area of ​​the second region to the total cross-sectional area is smaller; conversely, in cross-sections closer to the 180-degree cross-section P2, the ratio of the second cross-sectional area of ​​the second region to the total cross-sectional area is larger.

[0038] As shown in Table 1 above, the ratios corresponding to contact lens 100 in the 30, 60, 90, 120, and 150 degree cross-sections are the same as the ratios corresponding to contact lens 100 in one of the 330, 300, 270, 240, and 210 degree cross-sections. In other words, the ratios corresponding to contact lens 100 in one of the 1–179 degree cross-sections are the same as the ratios corresponding to contact lens 100 in one of the 181–359 degree cross-sections.

[0039] As described above, in one embodiment of the contact lens 100, the ratio of the second cross-sectional area to the sum of the cross-sectional areas of the second region of the contact lens 100 in a cross-sectional plane at a first angle to the difference between the second cross-sectional area to the sum of the cross-sectional areas of the second region of the contact lens 100 in a cross-sectional plane at a second angle is less than 1%, the first angle is between 1 and 179 degrees, the second angle is between 181 and 359 degrees, and the sum of the first angle and the second angle is 360 degrees.

[0040] In one practical application, the ratio (R) of the second cross-sectional area to the total cross-sectional area in the cross-sectional plane of the contact lens at different azimuth angles can be related to the azimuth angle by the following formula: R(θ)=P−(a*sin(k*f)+b*cos(k*f)), where θ is the azimuth angle and f= |π−|θ−180 ∘ ||, 0.9 ≤ P ≤ 2.0, 0.01 ≤ a ≤ 0.2, 0.03 ≤ b ≤ 0.4, 0.8 ≤ k ≤ 1.5, 0 ≤ θ ≤ 360. For example, if the azimuth angle θ = 30... ∘ Then f = |π−150 ∘ |, Azimuth 150 ∘ Converting to radians, we get (150π) / 180, and f = |π - ((5π) / 6)| = π / 6.

[0041] When the ratio of the second cross-sectional area corresponding to the second region 12 to the sum of the cross-sectional areas in the 0-degree cross-sectional plane P1 of the contact lens 100 is defined as 1, then the ratio of the second cross-sectional area to the sum of the cross-sectional areas in the cross-sectional plane at different azimuth angles of the contact lens is between 1 and 1.86.

[0042] As shown in Table 2 below, in the example where P=2.0, a=0.01, b=0.60, k=1.0 in the above relationship, the azimuth angle changes from 0... ∘ ~330 ∘ The corresponding normalized ratios are shown in Table 2 below. The calculation method for the multiple normalized ratios is as follows: first, calculate the ratio (R) corresponding to each azimuth using the above formula; then divide each ratio (R) by the formula, where the azimuth is 0. ∘ The corresponding ratio (R).

[0043] Table 2:

[0044]

[0045] As shown in Table 3 below, in the example where P=1.07, a=0.01, b=0.06, k=1.23 in the above relationship, the azimuth angle changes from 0... ∘ ~330 ∘ The corresponding normalized ratios are shown in Table 3 below. The calculation method for the multiple normalized ratios is as follows: first, calculate the ratio (R) corresponding to each azimuth angle using the above formula; then divide each ratio (R) by the azimuth angle, where azimuth is 0. ∘ The corresponding ratio (R).

[0046] Table 3:

[0047]

[0048] As shown in Table 4 below, in the example where P=1.10, a=0.04, b=0.11, k=1.32 in the above relationship, the azimuth angle changes from 0... ∘ ~330 ∘ The corresponding normalized ratios are shown in Table 4 below. The calculation method for the multiple normalized ratios is as follows: first, calculate the ratio (R) corresponding to each azimuth angle using the above formula; then divide each ratio (R) by the formula, where the azimuth angle is 0. ∘ The corresponding ratio (R).

[0049] Table 4:

[0050]

[0051] With the above design, when contact lens 100 is worn, Figure 2The position of the 180-degree cross-section plane P2 will automatically be close to the user's lower eyelid, and Figure 2 The position corresponding to the 0-degree cross-section plane P1 is located close to the user's upper eyelid. Therefore, during the manufacturing process of the contact lens 100 of the present invention, the pattern 2 can be positioned at a specific position on the contact lens 100 according to actual needs. In this way, when the contact lens 100 is worn, the pattern 2 will automatically be positioned in the expected position along with the contact lens 100.

[0052] For example, assuming that when the contact lens 100 is to be worn, pattern 2 is to be positioned close to the user's lower eyelid, then when manufacturing the contact lens 100, pattern 2 can be positioned adjacent to... Figure 2 The 180-degree cross-sectional plane P2 is positioned such that when a user wears the contact lens 100, pattern 2 will automatically move closer to the user's lower eyelid along with the contact lens 100. Similarly, if it is desired that pattern 2 is closer to the user's upper eyelid when the contact lens 100 is worn, pattern 2 can be positioned closer to the upper eyelid during the manufacturing of the contact lens 100. Figure 2 The position setting of the 0-degree cross-section plane P1.

[0053] like Figure 2 As shown, in one embodiment, the pattern 2 of the contact lens 100 may be formed on the toric lens body 1 by printing or other means after the toric lens body 1 of the contact lens 100 has been formed. The toric lens body 1 may also include a positioning mark structure 3, which may be formed in the second region 12. During the manufacturing process of the contact lens 100, the pattern printing equipment can use the positioning mark structure to confirm the printing position of the pattern 2, thereby ensuring that the pattern 2 is in the expected position when the final contact lens 100 is worn.

[0054] In summary, the contact lens 100 of the present invention, through the design that "the ratio of the second cross-sectional area to the sum of the cross-sectional areas (the sum of the first cross-sectional area and the second cross-sectional area) of the contact lens 100 in different azimuth angles varies with the azimuth angle, so that when the contact lens is worn, the pattern is close to a desired position of the user's eye," allows the pattern 2 to automatically move to the desired position after the contact lens 100 is worn, thereby allowing the user to obtain a relatively optional aesthetic after wearing the contact lens 100.

[0055] Please see Figure 7This is a schematic diagram illustrating the process of pad printing tip calibration and mold calibration in manufacturing the contact lenses of the present invention. The contact lens 100 of the present invention can be manufactured using a manufacturing machine, first forming a pattern in a mold, and then forming a toroidal lens body in the mold. As previously described, in order to ensure that the pattern is correctly formed in the default position of the contact lens, the manufacturing machine can first perform a pad printing tip calibration and a mold calibration process during the manufacturing of the contact lenses of the present invention.

[0056] The pad printing head calibration procedure includes the following steps:

[0057] Step S11: After the printing pad is dipped in ink, the pattern is printed on a certain point on a positioning plate (such as a steel plate).

[0058] Step S12: Using an image acquisition device (e.g., a camera), acquire an image containing the positioning point and the pattern directly above the positioning point;

[0059] Compensation step S13: Analyze the acquired image to calculate a compensation value for the pad printing head on the X-axis and Y-axis, and adjust the position of the pad printing head according to the compensation values ​​on the X-axis and Y-axis.

[0060] By following the steps above, it can be ensured that the center of the pad printing head can be aligned with the center of the pattern during subsequent manufacturing processes, thereby ensuring that the pattern can be correctly formed on the pad printing head after it is dipped in ink.

[0061] The mold correction procedure includes the following steps:

[0062] Step S21: Using an image acquisition device, acquire a mold image of the mold from directly above the mold;

[0063] Compensation step S22: Analyze the mold image to calculate a compensation value for the pad printing head on the X and Y axes, and adjust the position of the pad printing head according to the compensation values ​​on the X and Y axes.

[0064] By following the steps above, it can be ensured that the center of the pad printing head can be aligned with the center of the mold during subsequent manufacturing processes. This ensures that the pad printing head with the pattern can correctly transfer the pattern into the mold.

[0065] As described above, the pad printing head calibration procedure and the mold calibration procedure ensure that the pad printing head can accurately transfer the pattern onto the mold. After the pattern is transferred onto the mold and cured, the manufacturing machine will inject molding liquid into the mold and form a toroidal lens body in the mold through baking and other steps.

[0066] Please refer to the following: Figure 8 and Figure 9 The figures shown are different schematic diagrams illustrating the wearing of the contact lenses of the present invention on the eyes. Through the above design, the contact lenses of the present invention allow for an offset angle of less than 30 degrees when worn, thus enabling the pattern on the contact lenses to be positioned close to the user's intended eye position.

[0067] like Figure 8 As shown, specifically, assuming an axis passing through a marker 4 of the contact lens 100 and the center of the contact lens 100 as a reference line F1, at... Figure 8 In the example where reference line F1 overlaps with a horizontal axis F2 of the eye E, contact lens 100... Figure 8 The state shown is defined as the expected ideal position. That is, in Figure 8 In the diagram, patterns 21 and 22 of the contact lens 100 are located in the ideal expected positions, that is, patterns 21 and 22 are close to the inner corner of the eye E1 and the outer corner of the eye E2, respectively. It should be noted that the above-mentioned marking 4 is only used to help define the reference line F1 in the diagram. In practice, the contact lens 100 does not have marking 4.

[0068] like Figure 9 As shown, the contact lens 100 of the present invention, through the aforementioned design such as the ratio of the second cross-sectional area to the total cross-sectional area, allows the offset angle Q of the contact lens 100 to be less than 30 degrees after being worn; that is, the angle Q between the reference line F1 and the horizontal axis F2 is less than 30 degrees. More specifically, after a user wears the contact lens 100, the contact lens 100 may move relative to the eyeball due to actions such as blinking or rubbing the eyes. When the contact lens 100 moves due to such actions, it will return to a state where the offset angle Q is less than 30 degrees due to the aforementioned design such as the ratio of the second cross-sectional area to the total cross-sectional area. Therefore, the patterns 21 and 22 of the contact lens 100 can be kept in the expected position. Without the design of the ratio of the second cross-sectional area to the total cross-sectional area of ​​the present invention, the offset angle Q of the contact lens 100 would be greater than 30 degrees, or even as high as 50 degrees or more.

[0069] During the manufacturing process of the contact lens 100 of the present invention, the design of the above-mentioned pad printing head correction procedure and mold correction procedure can further ensure that the pattern is accurately formed in the correct position of the contact lens. In this way, it can be ensured that the pattern is in the expected position when the contact lens is worn.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made based on the description and drawings of the present invention are included within the protection scope of the present invention.

Claims

1. A contact lens, characterized in that, The contact lens has a first area, a second area, and a pattern. In a top view of the contact lens, the pattern is non-mirror symmetrical on both sides of a preset axis, which passes through the center of the contact lens. With the central axis of the contact lens as the center and the radius of the contact lens as the width, in a cross-section of the contact lens at different azimuth angles, the sum of a first cross-sectional area corresponding to the first area and a second cross-sectional area corresponding to the second area is a total cross-sectional area. The ratio of the second cross-sectional area to the total cross-sectional area varies with the azimuth angle, so that when the contact lens is worn, the pattern is close to a desired position near the user's eye.

2. The contact lens according to claim 1, characterized in that, The area within a 4mm radius of the contact lens is defined as the first zone, and the remaining area is defined as the second zone.

3. The contact lens according to claim 2, characterized in that, The pattern is formed in the second region.

4. The contact lens according to claim 1, characterized in that, The ratio of the second cross-sectional area to the sum of the cross-sectional areas in the cross-sectional planes of the contact lens at different azimuth angles conforms to the following formula with respect to the azimuth angle: R(θ)=P−(a*sin(k*f)+b*cos(k*f)), where θ is the azimuth angle, f is radians, and f= |π−|θ−180 ∘ ||, 0.9 ≤ P ≤ 2.0, 0.01 ≤ a ≤ 0.2, 0.03 ≤ b ≤ 0.4, 0.8 ≤ k ≤ 1.5, 0 ≤ θ ≤ 360 ∘ .

5. The contact lens according to claim 1, characterized in that, The difference between the ratio of the second cross-sectional area corresponding to the second region of the contact lens in a cross-sectional plane at a first angle to the sum of the cross-sectional areas and the ratio of the second cross-sectional area corresponding to the second region of the contact lens in a cross-sectional plane at a second angle to the sum of the cross-sectional areas is less than 1%. The first angle is between 1 and 179 degrees, the second angle is between 181 and 359 degrees, and the sum of the first angle and the second angle is 360 degrees.

6. The contact lens according to claim 4, characterized in that, When the contact lens is in a 0-degree cross-sectional plane, the ratio of the second cross-sectional area corresponding to the second region to the sum of the cross-sectional areas is defined as 1. Therefore, the ratio of the second cross-sectional area to the sum of the cross-sectional areas of the contact lens in the cross-sectional plane at different azimuth angles is between 1 and 1.

86.

7. The contact lens according to claim 1, characterized in that, The contact lens has a positioning mark structure, which is positioned near the intended location when the contact lens is worn.

8. The contact lens according to claim 1, characterized in that, The contact lens manufacturing process includes a pad calibration procedure, which includes the following steps: One positioning pattern printing step: After dipping a pad printing head in ink, the pattern is printed on a specific point on a positioning plate; Step 1: Use an image acquisition device to acquire an image containing the positioning point and the pattern; A compensation step: Analyze the acquired image to calculate a compensation value for the pad printing head on the X-axis and Y-axis, and adjust the position of the pad printing head according to the compensation values ​​on the X-axis and Y-axis.

9. The contact lens according to claim 8, characterized in that, The manufacturing process of the contact lens also includes a mold calibration procedure, which includes the following steps: Step 1: Use an image acquisition device to acquire a mold image of a mold; A compensation step: Analyze the mold image to calculate a compensation value for the pad printing head on the X and Y axes, and adjust the position of the pad printing head according to the compensation values ​​on the X and Y axes.

Images