Method of measuring parameters of a contact lens
By creating a lens model and using high-precision measuring instruments to measure the contact lens parameters, the problem of inaccurate measurements by optical coherence tomography scanners was solved, and high-precision measurement of contact lens parameters was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-15
- Publication Date
- 2026-04-07
AI Technical Summary
In existing technologies, contact lens parameter measurement methods are easily affected by light and sound, resulting in low accuracy of measurement results. In particular, the measurement error is large for complex lenses such as scleral lenses, exceeding the standard tolerance range.
A lens model is formed by using a cured molding material, the lens model is cut to obtain the model to be tested, and high-precision measuring instruments are used for measurement to avoid interference from optical coherence tomography (OCT) scanners and obtain accurate parameters of the contact lens.
This improves the accuracy of contact lens parameter measurements, reduces errors, and ensures that measurement results meet standard requirements.
Smart Images
Figure CN115615334B_ABST
Abstract
Description
[0001] This application is a divisional application of the patent application with the application number 2020114733747, the application date of December 15, 2020, and the invention name of the method for measuring the parameters of contact lenses. TECHNICAL FIELD
[0002] The present disclosure relates to a method for measuring the parameters of contact lenses. BACKGROUND
[0003] A contact lens is a lens directly worn on the surface of the eye, such as a corneal lens, a scleral lens, etc., wherein the parameters of the contact lens, such as the angle of the arc region, the diameter, etc., can directly affect the wearing effect and visual safety of the contact lens, and therefore the measurement of the parameters of the contact lens is crucial for evaluating the quality of the contact lens product.
[0004] At present, the measurement method of the parameters of the contact lens generally adopts direct projection, such as the measurement method specified in the standard ISO 18369-3-2017, and the parameters of each arc region of the contact lens are usually measured using an optical coherence tomography (OCT), however, the optical coherence tomography is easily disturbed by light, sound, etc., resulting in low accuracy of the measurement results.
[0005] In addition, the structure of the contact lens itself can also affect the accuracy of the measurement by the optical coherence tomography, for example, the thickness of the sagittal depth and the edge of the scleral lens is larger than that of the ordinary corneal lens, which can easily lead to large errors in the measured data, exceeding the tolerance range specified in the standard. SUMMARY
[0006] In view of the above existing conditions, the purpose of the present disclosure is to provide a method for measuring the parameters of contact lenses which can improve the measurement accuracy.
[0007] To this end, the present disclosure provides a method of measuring a parameter of a contact lens, which includes: preparing a curing molding material and molding and curing the contact lens using the curing molding material to form a profiled and cured lens model including an inner lens surface of the contact lens; separating the lens model from the contact lens and cutting the lens model to form at least one test model, the lens model having an outer surface matching the inner lens surface, the outer surface being formed into a smooth surface; and measuring the at least one test model using a measuring instrument and obtaining a parameter of the lens model from a measurement result of the at least one test model, thereby obtaining a parameter of the contact lens corresponding to the lens model, in which the measuring instrument acquires an image of the test model and performs measurement analysis on the image to obtain the measurement result in measuring the test model. In the present disclosure, a lens model corresponding to a contact lens is obtained using a curing molding material, and the lens model is cut and measured to obtain a parameter of the contact lens, in which case, by measuring the cured lens model, an accurate parameter of the lens model can be obtained, and thus an accurate parameter of the contact lens can be obtained.
[0008] In addition, in the method according to the present disclosure, the contact lens can be marked to form a mark related to a sag of the contact lens on the formed lens model before the lens model is separated from the contact lens. Thus, a lens model with a mark can be formed.
[0009] In addition, in the method according to the present disclosure, the curing molding material can be filled in the concave inner lens surface of the contact lens and cover an edge of the contact lens to form the lens model in molding the contact lens. Thus, a lens model matching the inner lens surface of the contact lens can be obtained.
[0010] In addition, in the method according to the present disclosure, the inner lens surface of the contact lens can be placed upward in molding the contact lens. Thus, the inner lens surface of the contact lens can be easily molded.
[0011] In addition, in the method according to the present disclosure, the curing molding material can be injected in the inner lens surface of the contact lens in a spiral form from the center to the edge when the curing molding material is filled in the contact lens. Thus, the generation of bubbles in the process of filling the contact lens can be reduced.
[0012] In addition, in the method according to the present disclosure, the contact lens filled with the curing molding material can be placed with the inner lens surface downward in the curing molding process. Thus, the occurrence of deformation in the curing molding process can be reduced.
[0013] Additionally, in the method disclosed herein, optionally, the curing molding material is an impression material, such as silicone rubber impression material, polysulfide rubber impression material, polyether rubber impression material, agar colloid impression material, impression plaster, or zinc oxide eugenol paste. This enables the molding of contact lenses.
[0014] Additionally, in the method disclosed herein, optionally, during the measurement of the model under test, the cut surface of the model under test is placed on the stage of the measuring instrument for measurement. This facilitates the measurement of surface parameters of the model under test.
[0015] Additionally, in the method disclosed herein, optionally, the contact lens is a corneal contact lens, orthokeratology lens, or scleral contact lens having multiple arc zones, and the parameters include the angles and diameters of the multiple arc zones. Thus, it is possible to measure the angles and diameters of multiple arc zones of various contact lenses.
[0016] Alternatively, in the methods disclosed herein, the measuring instrument may be a stereomicroscope or a high-precision projector, wherein the high-precision projector is a projection device with measurement software or a built-in XY counter, goniometer, and digital display. Thus, measurement can be performed using the projection method.
[0017] According to this disclosure, a method for measuring the parameters of a contact lens that can improve measurement accuracy can be provided. Attached Figure Description
[0018] Embodiments of this disclosure will now be explained in further detail by way of example only with reference to the accompanying drawings, in which:
[0019] Figure 1 This is a flowchart illustrating a method for measuring the parameters of a contact lens as described in the examples of this disclosure.
[0020] Figure 2 This is a schematic diagram illustrating a scene of lens model solidification and molding as described in the examples of this disclosure.
[0021] Figure 3 This is a schematic diagram illustrating the structure of the lens model involved in the example of this disclosure.
[0022] Figure 4 This is a schematic diagram illustrating the structure of the scleral contact lens involved in the example of this disclosure.
[0023] Figure 5 This is a schematic diagram illustrating the structure of the model under test involved in the example of this disclosure.
[0024] Figure 6 This is a schematic diagram illustrating a scenario involving the measurement of the model under test as described in the examples of this disclosure.
[0025] Figure 7 It shows Figure 6 An enlarged schematic diagram of the model under test. Detailed Implementation
[0026] All references cited in this disclosure are incorporated herein by reference in their entirety, as fully illustrated. Unless otherwise defined, the technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.
[0027] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals will be used for the same components, and repeated descriptions will be omitted. Furthermore, the drawings are merely schematic diagrams, and the proportions of the components or the shapes of the components may differ from actual figures.
[0028] In this disclosure, the method for measuring the parameters of the contact lens S can be simply referred to as the measurement method. Furthermore, the method for measuring the parameters of the contact lens S involved in this disclosure may include preparing a lens model 2 and measuring the parameters of the lens model 2 to obtain the parameters of the contact lens S.
[0029] In this disclosure, the contact lens S may have an inner mirror surface S1 and an outer mirror surface S2 (see [reference]). Figure 1 The inner mirror surface S1 of the contact lens S can be concave, and the outer mirror surface S2 can be convex. Furthermore, the measurement method disclosed herein can measure the parameters of the inner mirror surface S1 of the contact lens S.
[0030] In some examples, the method for measuring the parameters of the contact lens S may include preparing a lens model 2; and measuring the parameters of the lens model 2 to obtain the parameters of the contact lens S.
[0031] In some examples, methods for measuring the parameters of the contact lens S may include preparing a curing material 1 and using the curing material 1 to mold the contact lens S to form a lens model 2.
[0032] Figure 1 This is a flowchart illustrating a method for measuring the parameters of a contact lens S as described in the examples of this disclosure.
[0033] In this embodiment, such as Figure 1 As shown, the method for measuring the parameters of the contact lens S may include preparing a curing material 1 and using the curing material 1 to shape and cure the contact lens S, forming a lens model 2 containing the outline of the inner mirror surface S1 of the contact lens S and curing it (step S10).
[0034] In some examples, in step S10, the contact lens S can be placed on a flat surface. In other examples, in step S10, during the molding process of the contact lens S, the inner mirror surface S1 of the contact lens S can be placed facing upwards. This facilitates the molding of the inner mirror surface S1 of the contact lens S. Furthermore, the contact lens S can be molded at room temperature of 15 to 25°C to form the lens model 2.
[0035] In some examples, in step S10, the outer mirror surface S1 of the contact lens S can be adsorbed using a contact lens suction stick to shape the contact lens S.
[0036] In some examples, as described above, step S10 may include preparing a curable molding material 1. Additionally, in some examples, the curable molding material 1 may be an impression material. This enables the contact lens S to be molded, facilitating the rapid formation of a morphologically stable lens model 2.
[0037] In some examples, the impression material may include a matrix and a catalyst. Additionally, in some examples, in step S10, the impression material can be obtained by mixing the matrix and the catalyst. That is, the cured molding material 1 can be obtained by mixing the matrix and the catalyst.
[0038] In some examples, the curing time in step S10 can be adjusted by changing the ratio of matrix to catalyst. In other examples, the curing time in step S10 can be 1 to 3 minutes. For example, the curing time can be 1 minute, 1.2 minutes, 1.5 minutes, 1.8 minutes, 2 minutes, 2.5 minutes, or 3 minutes. Furthermore, the hardness of the lens model 2 can be adjusted by changing the ratio of matrix to catalyst. For example, the ratio of matrix to catalyst can be 1:1. Thus, a lens model 2 with suitable hardness can be obtained.
[0039] In some examples, the impression material can be silicone rubber impression material, polysulfide rubber impression material, polyether rubber impression material, agar colloid impression material, impression plaster, or zinc oxide eugenol paste.
[0040] In some examples, the curing material 1 can be injected into the inner mirror surface S1 of the contact lens S to form a lens model 2.
[0041] In some examples, in step S10, when filling the contact lens S with the cured molding material 1, the cured molding material 1 can be injected into the inner mirror surface S1 of the contact lens S in a spiral manner from the center to the edge. This reduces the generation of air bubbles during the filling process of the contact lens S (inner mirror surface S1). In other words, injection can begin from the center of the contact lens S and then proceed in a circular motion outwards.
[0042] In some examples, in step S10, the curing material 1 can be injected starting from the center of the contact mirror S, and then injected outwards in a circular motion while the contact mirror S is rotated simultaneously. Additionally, the direction in which the curing material 1 is injected in a circular motion can be different from the direction of rotation of the contact mirror S (e.g., opposite).
[0043] In some examples, when filling the contact mirror S with the cured molding material 1, the cured molding material 1 can be injected at a uniform rate. This helps to reduce the generation of air bubbles.
[0044] In some examples, in step S10, the curing material 1 can be injected toward the center of the contact lens S. This facilitates the fixation of the contact lens S during the injection of the curing material 1. Additionally, the contact lens S can be secured using a contact lens suction stick during the injection of the curing material 1.
[0045] Figure 2 This is a schematic diagram illustrating a scene where the lens model 2 involved in the example of this disclosure is cured and molded.
[0046] Specifically, during the molding process of the contact lens S, the cured molding material 1 can be filled into the concave inner mirror surface S1 of the contact lens S and cover the edge of the contact lens S to form a lens model 2. Thus, a lens model 2 that matches the inner mirror surface S1 of the contact lens can be obtained. Additionally, in some examples, such as... Figure 2 As shown, the cured molding material 1 can overflow the edge of the contact mirror S.
[0047] In some examples, in step S10, the contact mirror S filled with the curing material 1 can be inverted and cured on a smooth surface (e.g., a glass, metal, or plastic surface). That is, during the curing process, the contact mirror S filled with the curing material 1 is placed with the inner mirror surface S1 facing down (see [reference]). Figure 2 This reduces the likelihood of deformation during the curing and molding process.
[0048] In some examples, step S10 may include removing excess cured molding material 1 to form the lens model 2. In other examples, excess cured molding material 1 may be removed along the edge of the contact lens S. Alternatively, excess cured molding material 1 may be removed using a blade. For example, excess cured molding material 1 may be cut off using a blade.
[0049] In some examples, in step S10, the contact mirror S filled with the cured molding material 1 can be held in place by hand or other tools, and excess cured molding material 1 can be removed. In other examples, during the removal of excess cured molding material 1, the inner mirror surface S1 of the contact mirror S can face downwards. Additionally, during the removal of excess cured molding material 1, the contact mirror S filled with the cured molding material 1 can be perpendicular to the plane on which it is placed.
[0050] Figure 3 This is a schematic diagram illustrating the structure of lens model 2, which is an example of the present disclosure.
[0051] In some examples, in step S10, such as Figure 3 As shown, the lens model 2 may have an outer surface 21 and a bottom surface 22. Furthermore, the outer surface 21 may be formed as a smooth surface. Additionally, the bottom surface 22 of the lens model 2 may intersect with the outer surface 21 (see [reference]). Figure 3 ).
[0052] In some examples, the outer surface 21 of the lens model 2 can match the inner mirror surface S1 of the contact lens S. That is, the lens model 2 can have an outer surface 21 that matches the inner mirror surface S1. In this case, by measuring the outer surface 21 of the lens model 2 to obtain the surface morphology of the outer surface 21, it is possible to obtain the parameters, such as geometric parameters, of the inner mirror surface S1 of the contact lens S through the surface morphology.
[0053] In some examples, the outer surface 21 of the lens model 2 can be formed as the contour of the lens model 2. In some examples, the lens model 2 of the contact lens S can have a contour that matches the inner mirror surface S1 of the contact lens S. In other words, the lens model 2 can be imprinted with the contour of the inner mirror surface S1 of the contact lens S. In this case, by measuring the contour of the lens model 2, the parameters of the inner mirror surface S1 of the contact lens S can be obtained.
[0054] In some examples, as described above, the lens model 2 can have the same profile as the inner mirror surface S1 of the contact lens S (i.e., the contour of the inner mirror surface S1). Specifically, the lens model 2 can be formed by filling the inner mirror surface S1 of the contact lens S with a curable molding material 1 and then curing it, thus the lens model 2 can have an outer surface 21 with the same contour as the inner mirror surface S1 of the contact lens S. In other words, the lens model 2 can have an outer surface 21 with parameters matching the inner mirror surface S1 of the contact lens S (see...). Figure 3 In this case, the parameters of the inner mirror surface S1 of the contact lens S can be obtained by measuring the outer surface 21 of the lens model 2. That is, the parameters of the outer surface 21 of the lens model 2 can be consistent with the parameters of the inner mirror surface S1 of the contact lens S. In addition, the parameters of the lens model 2 can refer to the parameters of the outer surface 21 of the lens model 2.
[0055] In some examples, the lens model 2 may have markings in step S10. Additionally, in some examples, the markings on the lens model 2 may correspond to those on the contact lens S. For example, the markings on the lens model 2 may correspond to the central axis of the contact lens S, or the markings on the lens model 2 may correspond to the axial direction of the contact lens S, etc.
[0056] In some examples, in step S10, a marking tool can be used to mark the lens model 2. For example, a marking tool such as a pen, blade, or toothpick can be used to mark the lens model 2 to form a mark.
[0057] In other examples, lens model 2 may have markings related to the depth of sagitta of contact lens S. This facilitates the measurement of toric lenses (contact lens S with astigmatism). For example, lens model 2 may have bi-sagittal axis markings corresponding to the bi-sagittal axis of contact lens S. Furthermore, the markings on lens model 2 can be customized according to the specific structure, design, etc., of contact lens S.
[0058] In some examples, in step S10, before separating the lens model 2 from the contact lens S (e.g., after removing excess cured molding material 1), the lens model 2 can be marked to form a mark. This allows for the formation of a marked lens model 2. For example, before separating the lens model 2 from the contact lens S, the lens model 2 can be marked to form a mark related to the depth of cut of the contact lens S.
[0059] In other examples, in step S10, markings may be made during the molding of the contact lens S to form a mark related to the depth of the contact lens S in the formed lens model 2.
[0060] In some examples, in step S10, the lens model 2 formed by curing the curing material 1 can be stable and not easily deformed.
[0061] In some examples, in step S10, the contact lens S may have multiple arc regions. In other examples, the inner mirror surface S1 of the contact lens S may have multiple arc regions. Additionally, in this embodiment, one or more arc regions of the contact lens S can be measured.
[0062] In some examples, the outer surface 21 of the lens model 2 may have multiple contour areas that respectively match multiple arc regions of the contact lens S. In other words, the lens model 2 may have multiple contour areas that match multiple arc regions of the contact lens S.
[0063] As described above, the contact lens S can have multiple arc regions, and the inner mirror surface S1 can have multiple arc regions. In some examples, the lens model 2 can have multiple contour regions that respectively match the multiple arc regions of the contact lens S. In other words, the lens model 2 can have multiple contour regions that correspond to the multiple arc regions of the contact lens S. Furthermore, the multiple contour regions of the lens model 2 can be formed on the outer surface 21 of the lens model 2.
[0064] In some examples, the contact lens S can be a corneal contact lens, an orthokeratology lens, or a scleral contact lens. In other examples, the contact lens S can be a corneal contact lens, an orthokeratology lens, or a scleral contact lens with multiple curved zones. This allows for the measurement of parameters of multiple curved zones of various contacts.
[0065] In some examples, the parameters of the contact lens S may include the angles and diameters of multiple arc regions. This allows for the measurement of the angles and diameters of multiple arc regions of the contact. In other words, the parameters of the contact lens S may include the angles and diameters of multiple arc regions of the inner mirror surface S1.
[0066] In some examples, the diameter of each arc region in the contact mirror S can refer to the diameter of the outermost edge of each arc region, where the outermost edge can be the edge of the arc region furthest from the center of the contact mirror S. In some examples, the angle of each arc region in the contact mirror S can refer to the angle formed by each arc region and its diameter (or the diameter of the contact mirror S).
[0067] Figure 4 This is a schematic diagram illustrating the structure of the scleral contact lens 3 involved in the example of this disclosure.
[0068] In some examples, the contact lens S can be a scleral contact lens 3 having an optical zone 3a, a mid-peripheral filling zone 3b, and a limbal filling zone 3c (see [reference]). Figure 1 That is, the inner surface 31 of the scleral contact lens 3 can have three arcuate regions corresponding to the optical region 3a, the intermediate peripheral filling region 3b, and the limbal filling region 3c, respectively. Therefore, it is possible to measure the parameters of the inner surfaces of the optical region 3a, the intermediate peripheral filling region 3b, and the limbal filling region 3c of the scleral contact lens 3.
[0069] In such Figure 4 In the example shown, the scleral contact lens 3 may have an optical zone 3a, a mid-peripheral filling zone 3b, and a limbal filling zone 3c. The scleral contact lens 3 may have three arc zones: an optical zone 3a, a mid-peripheral filling zone 3b, and a limbal filling zone 3c.
[0070] In some examples, such as Figure 4 As shown, the optical zone 3a can surround the mid-peripheral filling zone 3b, and the limbal filling zone 3c can surround the mid-peripheral filling zone 3b.
[0071] In some examples, such asFigure 4 As shown, the thickness of the mid-peripheral filling region 3b can be greater than the thickness of the optical region 3a. Additionally, the thickness of the limbal filling region 3c can be greater than the thickness of the optical region 3a. In other examples, the thickness of the scleral contact lens 3 can gradually increase from the optical region 3a to the limbal filling region 3c.
[0072] In some examples, the thickness of the limbal filling area 3c can be from 0.05 mm to 0.1 mm. For example, the thickness of the limbal filling area 3c can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.1 mm.
[0073] In some examples, the outer surface of the lens model formed by molding the scleral contact lens 3 may have an optical contour area, a mid-peripheral contour area, and a limbal contour area that respectively match the optical region 3a, the intermediate peripheral filling region 3b, and the limbal filling region 3c. Specifically, the outer surface of the lens model formed by molding the scleral contact lens 3 may have an optical contour area, a mid-peripheral contour area, and a limbal contour area that respectively match the inner lens surface of the optical region 3a, the inner lens surface of the mid-peripheral filling region 3b, and the inner lens surface of the limbal filling region 3c.
[0074] In some examples, the parameters of the outer surface of the lens model formed by molding the scleral contact lens 3 may include the parameters of the inner mirror surface of the optical zone 3a, the parameters of the inner mirror surface of the mid-peripheral filling zone 3b, and the parameters of the inner mirror surface of the limbal filling zone 3c.
[0075] In some examples, the parameters of the endoscopic surface of the optical region 3a, the endoscopic surface of the intermediate peripheral filling region 3b, and the endoscopic surface of the limbal filling region 3c can be obtained by measuring the parameters of the optical contour region, the intermediate peripheral contour region, and the limbal contour region.
[0076] In some examples, such as Figure 4 As shown, the scleral contact lens 3 may also include a positioning region 3d. Furthermore, the positioning region 3d may surround the limbal filling region 3c. Additionally, the thickness of the positioning region 3d may gradually decrease from its junction with the limbal filling region 3c to the edge of the scleral contact lens 3.
[0077] In some examples, the outer surface of the lens model formed by molding the scleral contact lens 3 can have a positioning contour area that matches the positioning area 3d. Furthermore, by measuring the parameters of the positioning contour area, the parameters of the inner mirror surface of the positioning area 3d can be obtained.
[0078] In some examples, step S20 can be performed after removing excess cured molding material 1.
[0079] In this embodiment, such as Figure 1As shown, the method for measuring the parameters of the contact lens S may include separating the lens model 2 from the contact lens S and cutting the lens model 2 to form at least one model 2a to be tested (step S20).
[0080] In some examples, as described above, the lens model 2 can be separated from the contact lens S. This allows for the acquisition of an independent lens model 2. In other words, the lens model 2 can be detached from the contact lens S to obtain an independent lens model 2.
[0081] In some examples, in step S20, an auxiliary tool with a pointed tip can be used for separation. For example, a toothpick, needle, or other auxiliary tool with a pointed tip can be used to separate the lens model 2 from the contact lens S.
[0082] In some examples, after the lens model 2 is separated, the lens model 2 can be cut to form the model to be tested 2a.
[0083] Figure 5 This is a schematic diagram illustrating the structure of the model under test 2a involved in the example of this disclosure.
[0084] In some examples, in step S20, the lens model 2 can be cut to form the model to be tested 2a (see [reference]). Figure 5 In other examples, the lens model 2 can be cut vertically. Furthermore, cutting the lens model 2 can create multiple test models 2a. For example, two, three, four, or six test models 2a can be created.
[0085] In some examples, such as Figure 5 As shown, the model under test 2a may have a cut surface 23. In addition, the surface 21a of the model under test 2a may be formed by cutting the outer surface 21 of the lens model 2, and the bottom surface 22a of the model under test 2a may be formed by cutting the bottom 22 of the lens model 2.
[0086] In some examples, the lens model 2 can be cut according to the markings on it. In other examples, the test model 2a with a cut surface 23 can be formed by cutting downwards from the center of the markings on the lens model 2.
[0087] In some examples, cutting tools can be used for cutting. For example, a sharp blade, ruler, or other cutting tools can be used. Alternatively, the lens model 2 can be held in place by hand or other tools during cutting.
[0088] In some examples, two test models 2a can be formed by cutting along the central axis markings on the lens model 2. Additionally, in some examples, cutting along the double depth axis markings on the lens model 2 can form two test models 2a with different depths.
[0089] In some examples, the model to be tested 2a can be symmetrical in step S20. This can help improve the accuracy of the measurement. For example, the model to be tested 2a can be left-right symmetrical, that is, the model to be tested 2a can be symmetrical with respect to the vertical plane of the cutting surface 23.
[0090] In some examples, the model under test 2a may have multiple measurement areas that match multiple arc regions of the contact lens S. In other examples, the parameters of the multiple measurement areas of the model under test 2a may be consistent with the parameters of the corresponding multiple arc regions of the contact lens S. Alternatively, the parameters of the model under test 2a may refer to the parameters of the multiple measurement areas of the model under test 2a.
[0091] In some examples, multiple measurement areas of the model under test 2a can be formed by cutting multiple contour areas of the lens model 2.
[0092] In this embodiment, such as Figure 1 As shown, the test model 2a is measured, and the parameters of the lens model 2 are obtained based on the measurement results of at least one test model 2a, thereby obtaining the parameters of the contact lens S corresponding to the lens model 2 (step S30).
[0093] In some examples, in step S30, multiple test models 2a can be measured separately. Additionally, in step S30, the parameters of the test model 2a can be obtained by measuring it. In other examples, a projection method can be used to measure the test model 2a.
[0094] In some examples, in step S30, the measuring instrument 4 can be used to measure at least one parameter of the model under test 2a (see...). Figure 6 In other examples, during step S30, multiple measurement areas of the model 2a under test can be measured. Additionally, the parameters of the model 2a under test can be the angles and diameters (or radii) of multiple (or one) measurement areas of the model 2a.
[0095] In some examples, in step S30, the parameters of the lens model 2 can be obtained from the parameters of the model under test 2a. Alternatively, the parameters of the model under test 2a can be obtained from the parameters of the lens model 2. Furthermore, the parameters of the lens model 2 can be the angles and diameters of multiple (or one) contour regions of the lens model 2.
[0096] In some examples, in step S30, the measuring instrument 4 can be a stereomicroscope or a high-precision projector. This allows for measurement using a projection method. The high-precision projector can be a projection device with measurement software or a built-in XY counter, goniometer, and digital display.
[0097] In some examples, during step S30, the measuring instrument 4 can acquire an image of the model 2a under test during the measurement process. For example, the measuring instrument 4 can obtain an image of the model 2a under test by scanning or photography.
[0098] In some examples, in step S30, the measuring instrument 4 can perform measurement analysis on the image to obtain measurement results. For example, the measuring instrument 4 can perform measurement analysis using measurement software or measuring tools (such as a built-in XY counter or goniometer).
[0099] Figure 6 This is a schematic diagram illustrating a scenario for measuring the model under test 2a as described in the example of this disclosure. Figure 7 It shows Figure 6 An enlarged schematic diagram of the model under test 2a.
[0100] In some examples, such as Figure 6 As shown, the measuring instrument 4 may have a stage 41. Additionally, in some examples, such as... Figure 6 and Figure 7 As shown, during the measurement of the model 2a to be measured, the cut surface 23 of the model 2a to be measured can be placed on the stage 41 of the measuring instrument 4 for measurement. This facilitates the measurement of the parameters of the surface 21a of the model 2a to be measured. In other words, the cut surface 23 of the model 2a to be measured can be attached to the stage 41 of the measuring instrument 4 for measurement.
[0101] In some examples, the measuring instrument 4 can be calibrated before measurement in step S30. This helps to improve the accuracy of the measurement. Additionally, the measurement can be performed at room temperature of 15 to 25°C.
[0102] In some examples, in step S30, the parameters of each measurement area of the model under test 2a can be measured separately.
[0103] In some examples, when measuring the angle using the measuring instrument 4 in step S30, the baseline can be made to coincide with the tangent side of the measurement area of the model to be measured 2a, and then the reading of one side can be obtained. Then, the other side of the model to be measured is measured to obtain the reading of the other side. The readings of the two sides are added together and the average value is taken as the angle value.
[0104] In some examples, in step S30, the angles symmetrical on both sides of the measurement area of the model under test 2a can be measured simultaneously using a software angle measuring tool, and the average value can be taken as the angle value. Furthermore, the angle of the arc area corresponding to the contact mirror S can be obtained based on the obtained angle value.
[0105] In this embodiment, a lens model 2 corresponding to the contact lens S is obtained using a cured molding material 1. The lens model 2 is then cut and measured to obtain the parameters of the contact lens S. In this case, by measuring the cured lens model 2, accurate parameters of the lens model 2 can be obtained, thereby obtaining accurate parameters of the contact lens S. Obtaining the parameters of the contact lens S by measuring the cured lens model 2 avoids the influence of interfering factors as in direct measurement of the contact lens S, thus enabling accurate measurement of the contact lens S's parameters.
[0106] According to this disclosure, a method for measuring the parameters of a contact lens S that can improve measurement accuracy can be provided.
[0107] While the present disclosure has been specifically described above in conjunction with the accompanying drawings and embodiments, it is to be understood that the above description does not limit the present disclosure in any way. Those skilled in the art can make modifications and variations to the present disclosure as needed without departing from its essential spirit and scope, and all such modifications and variations fall within the scope of the present disclosure.
Claims
1. A method for measuring the parameters of a contact lens, characterized in that, include: Before separating the lens model containing the contour of the inner mirror surface of the contact lens from the contact lens, the lens model is marked to form a mark related to the depth of sagitta of the contact lens. The lens model has an outer surface that matches the inner mirror surface of the contact lens. The lens model is separated from the contact lens, and the lens model is cut according to the mark to form at least one test model. The mark includes a double depth of sagitta axis mark. Two test models with different depths of sagitta are cut along the double depth of sagitta axis mark to measure the toroidal lens. An image of the at least one test model is acquired using a measuring instrument and measured and analyzed to obtain the measurement result of the at least one test model. The parameters of the lens model are obtained based on the measurement result, thereby obtaining the parameters of the contact lens corresponding to the lens model. The at least one test model is symmetrical, and the angle of the contact lens obtained from the test model is averaged to obtain the angle of the contact lens corresponding to the lens model.
2. The method as described in claim 1, characterized in that: The method also includes preparing a curing molding material and using the curing molding material to shape and cure the contact lens to form the lens model. During the shaping process of the contact lens, the curing molding material is filled into the concave inner mirror surface of the contact lens and covers the edge of the contact lens, and the outer surface is formed into a smooth surface.
3. The method as described in claim 2, characterized in that: Before forming the lens model, excess cured molding material is removed by placing the contact lens with the inner mirror face down.
4. The method as described in claim 2, characterized in that: During the molding process of the contact lens, the outer surface of the contact lens is adsorbed using a contact lens suction stick, and then the contact lens is molded.
5. The method as described in claim 1, characterized in that: The parameters of the contact mirror include the angles and diameters of multiple arc regions.
6. The method as described in claim 2, characterized in that: When the cured molding material is filled into the contact mirror, the cured molding material is injected into the inner mirror surface of the contact mirror in a spiral manner from the center to the edge.
7. The method as described in claim 6, characterized in that: While the cured molding material is injected in a spiral manner, the contact mirror is rotated, and the direction of the spiral of the cured molding material is different from the direction of rotation of the contact mirror.
8. The method as described in claim 2, characterized in that: The curing material is an impression material, which includes a matrix and a catalyst. The curing time and the hardness of the lens model are adjusted by changing the ratio of the matrix and the catalyst.
9. The method as described in claim 1, characterized in that: The contact lens is a scleral contact lens. The outer surface of the lens model has an optical contour area, a mid-peripheral contour area, and a limbal contour area that respectively match the optical zone, the mid-peripheral filling area, and the limbal filling area. By measuring the parameters of the optical contour area, the mid-peripheral contour area, and the limbal contour area, the parameters of the inner mirror surface of the optical zone, the parameters of the inner mirror surface of the mid-peripheral filling area, and the parameters of the inner mirror surface of the limbal filling area are obtained.
Citation Information
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