JP2005201660A - Method for measuring three-dimensional surface shape of contact lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out high accuracy measurement of the three-dimensional surface shape of the inner surfaces of orthokeratology contact lenses. <P>SOLUTION: For measuring the three-dimensional surface shape of the inner surface 2s of a contact lens 2, such as an orthokeratology contact lens, having a shape having both a plurality of combined regions having different curves and at least blended parts of combined parts; and a button type lens 1, having a machined surface machined into a shape having a plurality of regions and non-blended combined parts of the region is used as a holder of the contact lens 2 to be measured. While the boundary of the region of the button-type lens 1 is verified via the contact lens 2, in a state of being held on the machined surface 1s of the button type lens 1, the three-dimensional surface shape of the contact lens is measured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for measuring a three-dimensional surface shape of a contact lens, and more particularly to a method for measuring a three-dimensional surface shape applicable to orthokeratology, which is a method of treating human myopia and astigmatism using a hard contact lens. .

  Orthokeratology (also called Ortho-K), which is a technique for treating human myopia and astigmatism using hard contact lenses, is becoming widespread. In orthokeratology, myopia and astigmatism can be corrected by causing deformation of the corneal epithelium with a hard contact lens.

  In other words, when a hard contact lens for orthokeratology (called an orthokey lens) is attached to the cornea, positive and negative stress (Negative Stress and Positive Stress) acts on the cornea due to the orthoker lens. The cornea begins to correct to shape. Here, correction of the cornea is performed not only according to the lens design of the ortho lens, but also according to the time conditions under which the stress acts.

FIG. 3 is a diagram showing an example of a contact lens design applied to orthokeratology. FIG. 3A is a schematic front view for explaining a configuration example of a contact lens in which a plurality of regions having different curves are combined. FIG. 3B is a diagram for explaining the relationship between each region of the contact lens and the cornea, and FIG. 3C is a partial schematic diagram for explaining an example of a cross-sectional shape of each region. is there.
A typical current ortho-lens lens is called “Accelated OrthoK” or “Advanced OrthoK”, and is composed of a multi-curve design of four curves in an inverse geometric design, that is, a reverse geometry design. That is, as shown in FIG. 3, a BC (base curve) 21 that forms a curved surface in the central region of the contact lens, an RC (reverse curve) 22 that forms a curve in the outer region, and a curve in the outer region are formed. An ortho lens is composed of four curve regions, that is, an AC (alignment curve) 23 and a PC (peripheral curve) 24 that forms a curve of the outermost outermost peripheral region.

The region forming the base curve 21 (BC region) is called a central zone or an optical zone, and is formed as a concave curve that is flat compared to the central surface of the patient's cornea. This BC region flattens the central portion of the patient's cornea, thereby improving the refractive index abnormality.
A region (RC region) forming the reverse curve 22 is disposed around the BC region. The RC region is configured not to contact the cornea and secures a space for receiving corneal tissue deformed by the pressure of the BC region.

In addition, the region (AC region) for forming the alignment curve 23 is designed according to the shape of the cornea, and the contact lens is fitted and centered in this region. It also has a function of inducing corneal tissue mutated by the pressure in the BC region to the RC region.
Further, the region (PC region) that forms the peripheral curve 24 has a function of preventing the contact lens from adhering to the cornea by urging the exchange of tears in the same manner as a normal hard contact lens.
Also, the joints of these four regions are polished and the curves are blended to form a continuous curved surface.

For example, as a technique invented by the same inventor as the present application, there is a contact lens for correcting myopia and / or astigmatism described in Patent Document 1. According to the contact lens of Patent Document 1, when RC = BC + 7.0 + 9.0D (diopter) and AC = BC + 2.0 + 4.0D (diopter) are satisfied, the refractive index abnormality of the patient's cornea is remarkably improved. The effect to do is obtained.
JP 2003-144479 A

  In the ortho lens as described above, a lens having a diameter of about 10 mm is divided into a plurality of (usually four) regions, and it is necessary to set an optimum curve for each patient in each region. If the shape of the curve is not adapted to the patient, the desired effect on the improvement of the refractive index abnormality of the cornea cannot be obtained. Therefore, a doctor prescribing an orthoker lens needs to select a lens having an optimal curve shape according to an individual patient.

  A measuring instrument that measures the three-dimensional surface shape of an orthopedic lens in order to verify that a lens prescribed by a doctor is manufactured according to the prescription, or to confirm the shape of an off-the-shelf orthokey lens. The need arises.

  For example, in order to measure surface irregularities of submicron to several tens of microns such as semiconductor ICs and optical parts with high accuracy, a three-dimensional surface measuring instrument using an optical interference method is provided. In a three-dimensional optical surface measuring instrument using such an optical interferometry, for example, when the reflected light from the measurement surface and the reflected light from the reference surface are caused to interfere with each other, the light / darkness is different for each half-wavelength optical path difference. By utilizing the fact that the interference fringes are observed, the three-dimensional surface shape can be measured.

  FIG. 4 is a schematic configuration diagram for explaining a configuration example of an interference microscope (Mirau type) applicable to a three-dimensional surface shape measuring apparatus using optical interferometry, in which 10 is a sample stage and 11 is an objective. Lens, 12 light source, 13 narrow band filter, 14 beam splitter, 15 Mirau interferometer, 16 CCD camera, 17 PZT (piezoelectric element), 18 PZT actuator, 19 PC (personal computer), 20 It is a measurement object.

  In the optical interference microscope of FIG. 4, white light is used as the light source 12 and the light source light that has passed through the narrow band filter 13 is directed toward the objective lens 11 by the beam splitter 14. Then, the light source light collected by the objective lens 11 is irradiated onto the measuring object 20 through the Mirau interferometer 15, and an interference image generated by the reflected light and the reference light from the Mirau interferometer 15 is transmitted through the beam splitter 14 to be charged by the CCD. An image is taken with the camera 16. At this time, when the objective lens 11 is scanned in the Z-axis direction (the optical axis direction of the light source light), an interference image having the maximum contrast at a position where the optical path difference between the measurement surface of the measurement object 20 and the reference surface becomes zero. Is imaged. The scanning of the objective lens 11 in the Z-axis direction is executed by operating the PZT 17 by the PZT actuator 18. The operation of the PZT actuator 18 is controlled by the PC 19. Further, the PC 19 performs arithmetic processing based on the image captured by the CCD camera 16.

  When the objective lens 11 is scanned in the Z-axis direction, paying attention to the luminance of the image picked up by the CCD camera 16, an interference waveform as shown in FIG. 5 is obtained. In FIG. 5, dots indicate measurement positions, and the height in the Z-axis direction at which the contrast of interference fringes is maximum is calculated from these measurement points. That is, since the peak position of the interference waveform corresponds to the height of the measurement surface of the measurement object 20, the height of each pixel in the screen imaged by the CCD camera 16 can be obtained, thereby A three-dimensional surface shape of the measurement object 20 can be obtained.

  FIGS. 6 to 9 are diagrams for explaining the adjustment method when the optical interference microscope as described above is applied to the measurement of the three-dimensional surface shape of the contact lens, and FIG. 6 shows the optical interference with the contact lens. FIG. 7 is a diagram for explaining tilt adjustment in the X direction, FIG. 8 is a diagram for explaining tilt adjustment in the Y direction, and FIG. 9 is a diagram in the Z direction. It is a figure for demonstrating height adjustment. In each figure, 2 is a contact lens to be measured, 2a to 2d are edge portions of the contact lens, 11 is an objective lens provided in the optical interference microscope, and F is a focal position of the objective lens.

  As shown in FIG. 6, here, the contact lens 2 has a hemispherical shape and is provided with a circular lens edge. Then, in order to set the relative position of the contact lens and the objective lens, tilt adjustment in the X direction (θx adjustment), tilt adjustment in the Y direction (θy adjustment), Z axis position adjustment (field adjustment), and Z axis Adjust the height of the direction.

  First, as shown in FIG. 7, in the adjustment of θx, the inclination (tilt) of the contact lens 2 in the X direction so that the two lens edge portions 2a and 2b in the X direction are aligned with the focal position F of the objective lens 11. ). That is, first, the focal position F of the objective lens 11 is set in the vicinity of one lens edge 2a (FIG. 7A), and the contact lens 2 is tilted in the X direction so that the edge 2a coincides with the focal position F. (FIG. 7B). At this time, the shift position in the X direction is also finely adjusted so that the center of the visual field coincides with the edge portion 2a. Then, after the edge portion 2a coincides with the focal position F, the contact lens 2 is shifted in the X direction to confirm that the opposite edge portion 2b is coincident with the focal position F (FIG. 7C).

  Next, as shown in FIG. 8 (FIGS. 8A to 8C), the lens edge portions 2c and 2d at the two positions in the Y direction are moved to the focal position F of the objective lens 11 by the same operation as in the X direction. The inclination of the contact lens 2 in the Y direction is adjusted so that

  Then, after the tilt in the X direction and the Y direction is adjusted by the above operation, as shown in FIG. 9, the position of the Z axis so that the center of the inner surface of the contact lens 2 matches the focal position F of the objective lens 11 ( That is, the field position of the optical interference microscope is adjusted (FIG. 9A), the height in the Z-axis direction is adjusted, and the focal position F is made to coincide with the inner surface position of the contact lens.

  At this time, if the inner surface has a certain curvature, the center point of the inner surface of the contact lens 2 coincides with the top of the inner surface and becomes the lowest point in the Z-axis direction. The Z-axis passes through the center point between the two edge portions 2a and 2b in the X direction and passes through the center point between the two edge portions 2c and 2d in the Y direction. That is, highly accurate three-dimensional surface shape measurement can be performed by making the center of the visual field in the three-dimensional surface shape measurement coincide with the center between the edges and making the plane including the edge perpendicular to the Z axis. Here, the axis passing through the center point between the edges in the predetermined direction of the contact lens is defined as the center axis. The inner surface center point is a center point between edges in a predetermined direction of the inner surface of the contact lens.

  In this way, the relative positional relationship between the objective lens and the contact lens of the optical interference microscope is adjusted, and the three-dimensional surface shape is measured as described above. By measuring the three-dimensional surface shape, the radius of curvature of the inner surface of the contact lens (for example, the respective curvature radii in the X direction and the Y direction orthogonal to each other) can be calculated.

In order to perform the alignment as described above, the contact lens to be measured is placed on a stage as shown in FIG. 10 capable of XY tilt and Z height adjustment. In FIG. 10, 10 is a sample stage, 31 is a θx tilt stage, 32 is a θy tilt stage, 33 is a Y direction uniaxial stage, 34 is a Z direction uniaxial stage, and 35 is an X direction uniaxial stage.
An operator who measures the shape of the contact lens 2 performs the alignment manually while adjusting each of the above stages, or operates the stage by automatic control based on the in-focus state and performs the alignment.

  As described above, when the three-dimensional surface shape of a contact lens is measured by optical interferometry using an optical interference microscope, the tilt is determined so that the edge of the measurement surface of the contact lens matches the focal position of the objective lens. Further, it is necessary to adjust the visual field position (center axis position) and the height in the Z-axis direction so that the center of the inner surface of the contact lens matches the focal position of the objective lens.

Here, when the measurement of the three-dimensional surface shape by the optical interferometry as described above is applied to the measurement of the ortho lens, a troublesome problem occurs regarding the specification of the curved surface and the tilt.
Thus, the ortho lens has a complicated shape in which regions having a plurality of lens curves are combined, and the connecting portions of these regions are blended. That is, when measuring the three-dimensional surface shape of an ortho lens, it is necessary to individually determine the tilt and field of view position (center axis position) and adjust the height in the Z-axis direction for a plurality of lens curves. is there.

At this time, since the plurality of curves of the ortho lens have different tilts, visual field positions, and heights in the Z-axis direction, the area of the curve is specified for each curve, and measurement conditions are individually set. There is a need.
However, when specifying the area of each curve, it is difficult to detect the edge of the curve in the orthokey lens because the combination part of a plurality of curves is blended as described above. The problem is that the tilt of the curve and the position of the visual field cannot be determined, and the three-dimensional surface shape cannot be measured well.

As a result of measuring the three-dimensional surface shape of the ortho lens using a conventional lens holder, the surface shape of the BC (base curve) region was measurable, but the RC (release curve) region of the outer region was measured. The measurement was not successful, and the shape measurement of the entire area of the ortho lens could not be performed accurately.
In other words, the conventional optical interference microscope can measure the three-dimensional surface shape of the BC of the conventional contact lens, but the object to be measured has a complicated shape curve such as the ortho lens to which the present invention is applied. There was a problem that could not be fully addressed.

  The present invention has been made in view of the above circumstances, and even in a measurement target object having a complicated surface shape such as an orthoker lens used in orthokeratology, a plurality of curve regions of the measurement target object are provided. It is an object of the present invention to provide a method for measuring the three-dimensional surface shape of a contact lens, which enables the specification of the three-dimensional surface shape of the ortho lens to be performed with high accuracy. .

  The invention according to claim 1 is a contact lens for measuring a three-dimensional surface shape of an inner surface of a contact lens having a shape in which a plurality of regions having different curves are joined and at least a part of a joined portion of each region is blended. The button-type lens having a processed surface processed into a shape having a plurality of regions and not blended to the above-described joint portion is measured on the contact lens to be measured. Using as a holder, with the contact lens held on the processed surface of the button lens, the three-dimensional surface shape of the contact lens is measured while checking the boundary of the button lens region through the contact lens. It is characterized by that.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the three-dimensional surface shape measurement of the inner surface of the button-type lens is performed by using an optical interference method.

  According to a third aspect of the present invention, in the second aspect of the invention, the optical interferometry irradiates the inner surface of the contact lens with the light source light collected by the objective lens through the interferometer, and the distance between the objective lens and the inner surface of the contact lens. To capture the interference image generated by the contact lens inner surface and the reference light from the interferometer, and obtain the height information of the inner surface of the button-type lens based on the position information where the contrast of the captured interference image is the highest. Thus, a three-dimensional surface shape is measured.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the edge of each region of the contact lens is identified based on the boundary of the region of the button lens that is confirmed through the contact lens, and the position information of the identified edge Based on the above, the position of the contact lens with respect to the interferometer is set for each region, and the three-dimensional surface shape is measured for each region.

  The invention of claim 5 is the invention of claim 4, wherein the X axis, the Y axis, and the Z axis that are orthogonal to each other are assumed, and the optical axis direction of the light source light that irradiates the contact lens is the Z axis. When measuring each region, the position of the measurement object is adjusted by adjusting the tilt in the X-axis and / or Y-axis direction, adjusting the position of the Z-axis relative to the measurement object, and adjusting the height of the measurement object in the Z-axis direction. In addition, the three-dimensional surface shape is measured after the alignment.

  According to the present invention, even in a measurement target object having a complicated surface shape such as an orthoker lens used in orthokeratology, it is possible to specify a plurality of curve regions of the measurement target object, and thereby, It is possible to provide a method for measuring the three-dimensional surface shape of a contact lens, which can perform the three-dimensional surface shape measurement of the inner surface of the lens with high accuracy.

In the present invention, a button-type lens is used as a holder for holding a contact that is a measurement object for measuring a three-dimensional surface shape.
As described above, when the three-dimensional surface shape of a measurement object is measured using an optical interference microscope, it is necessary to specify the curve region of the measurement object. In order to solve such a requirement, in the present invention, a button-type lens in which only the inner surface is processed under the contact lens processing conditions and is left unprocessed without blending the connecting portions of the curves is used as a holder. It is characterized by use.

FIG. 1 is a diagram for explaining the function of measuring the shape of a contact lens according to the present invention using a button lens as a holder. In the figure, 1 is a button lens, 1s is a processed surface of a button lens, Is a contact lens to be measured to be prescribed to a patient (hereinafter simply referred to as a contact lens), 2s is an inner surface of the contact lens (a surface that comes into contact with the cornea when prescribed to the patient), and 2r is an outer surface of the contact lens (to the patient). The side opposite to the side that contacts the cornea when prescribed).

  The button-type lens 1 is formed by processing only one surface of a button-type lens member under the same conditions as a contact lens when forming a contact lens, thereby forming a processed surface 1s. Originally, when manufacturing a contact lens, the processed surface 1s is a surface in contact with the patient's cornea and the opposite surface is processed into a predetermined spherical surface to obtain a contact lens product. The button surface lens is formed by processing only the processed surface 1s into the same shape as the contact lens. At this time, as the button-type lens 1 applied to the present invention, the boundary of the curve of the coupling portion is defined as a clear ridgeline without blending (polishing) the coupling portion of the plurality of curves included in the ortho lens. Use something that you can recognize.

  For example, as one method of manufacturing a contact lens, a rod-shaped lens member is made of a material such as PMMA, the lens member is shaved with a lathe, and further polished to finish. The button-type lens 1 has a lens member on the side opposite to the processing surface 1s (originally the outer surface side of the contact lens (the side opposite to the side that contacts the cornea when prescribed to a patient)) when the lens member is shaved with a lathe. It is made into unprocessed as it is cut out from, so that it can be stably installed on a fixture such as the sample stage 10. The button-type lens 1 is not limited to the cutting and polishing method as described above, and can be formed by appropriately using a known technique such as a cast molding method.

  FIG. 1A shows a button-type lens 1 and a contact lens 2 that are prepared. Here, the inner surface 2s of the contact lens has a multi-curve design as an ortho lens, and the processed surface 1s of the button-type lens 1 has a multi-curve that does not blend curves. As the inner surface 2s of the contact lens 2 and the processed surface 1s of the button-type lens 1, a multi-curve processed with the same design parameters is used. That is, the inner surface 2s of the contact lens 2 and the processed surface 1s of the button-type lens 1 are different from each other only in the presence or absence of blending to the joint portion of the multi-curve and are processed under the same conditions. The multi-curve design of the processed surface 2s of the button lens 2 and the inner surface 1s of the contact lens 1 is not shown.

  As shown in FIG. 1B, when the contact lens 2 is placed on the processing surface 1s of the button-type lens 1, the outer surface 2r of the contact lens 2 fits well with the processing surface 1s of the button-type lens 1, The contact lens 2 is stably held by the button lens 1 without being easily displaced. That is, the button type lens 1 is used as a holder for the contact lens 2.

The button-type lens 1 holding the contact lens 2 is, for example, installed on the sample stage 10 on the stage shown in FIG. 10 and arranged below the objective lens 11 of the optical interference microscope (FIG. 1C).
At this time, in order to perform the three-dimensional measurement of each curve of the ortho lens, it is necessary to specify the area of each curve of the ortho lens as described above. For that purpose, the boundary line of the curve of the button-type lens 1 is placed in the field of view of the optical interference microscope.

  FIG. 2 is a diagram schematically showing an example of the state of an image in the field of view of the optical interference microscope. In the figure, 3 is a field of view, 4a and 4b are multi-curve joints (boundary lines), and 5 is an interference fringe. is there. As shown in FIG. 2, the button-type lens 1 having a multi-curve having the same design as the multi-curve of the contact lens 2 is stacked below the contact lens 2, so that the processed surface 1 s of the button-type lens 1 is formed. The boundary lines 4a and 4b of the curve can be observed with an optical interference microscope through the contact lens 2.

  As described above, the contact lens 2 alone cannot identify the boundary of the curve in the multi-curve design of the ortho lens. However, the button-type lens 1 in which the curve coupling portion is not processed is used as the holder of the contact lens 2. And the boundary surface of the curve of the contact lens 2 can be easily specified by superimposing the processed surface 1 s of the button lens 1 on the contact lens 2.

  When the area of the curve to be measured is specified, the measurement range is specified for each curve of the multi-curve design of the ortho lens by using the area information, and the light source light is emitted in a specific direction according to the area information. The relative tilt angle between the optical axis and the stage is optimized, the center axis of the curve in the specific direction is determined, and the objective lens of the optical interference microscope is focused on the bottom surface center. Then, the objective lens is scanned in the Z-axis direction to pick up an interference image, and the height of the inner surface of the contact lens is calculated from the position where the contrast of the observed interference fringe 5 is maximized. Here, since the height information of the three-dimensional curved surface can be obtained in a matrix, a three-dimensional surface shape image can be displayed, and the radius of curvature of a predetermined axis can be obtained.

  At this time, when the processing set value of the lens processing machine was compared with the actually measured value and the correlation was observed, a clear correlation was obtained between the set value and the actually measured value. By performing the correction calculation based on this correlation, the degree of coincidence between the actually measured value and the set value can be verified. On the other hand, in the conventional measurement method, the correlation between the set value and the actual measurement value cannot be obtained, and the shape measurement is substantially impossible without reproducibility.

  As described above, according to the present invention, it is possible to specify a plurality of curve regions of an object to be measured even for an object having a complicated surface shape such as an orthoker lens used in orthokeratology. As a result, the three-dimensional surface shape of the inner surface of the ortho lens can be measured with high accuracy.

It is a figure for demonstrating the effect | action of the shape measurement of the contact lens concerning this invention which used the button type lens as a holder. It is a figure which shows typically an example of the state of the image in the visual field of an optical interference microscope. It is a figure which shows an example of the design of the contact lens applied to orthokeratology. It is a schematic block diagram for demonstrating the structural example of the interference microscope (Mirau type | mold) applicable to the three-dimensional surface shape measuring apparatus using an optical interference method. It is a figure explaining the interference waveform of the image imaged with the CCD camera, when scanning an objective lens to a Z-axis direction. It is a figure for demonstrating the adjustment method when applying an optical interference microscope with respect to the measurement of the three-dimensional surface shape of a contact lens. It is another figure for demonstrating the adjustment method when applying an optical interference microscope with respect to the measurement of the three-dimensional surface shape of a contact lens. FIG. 10 is still another view for explaining an adjustment method when an optical interference microscope is applied to measurement of a three-dimensional surface shape of a contact lens. FIG. 10 is still another view for explaining an adjustment method when an optical interference microscope is applied to measurement of a three-dimensional surface shape of a contact lens. It is a perspective schematic diagram explaining the example of composition of the stage holding a measuring object.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Button type lens, 1s ... Processing surface, 2 ... Contact lens, 2a, 2b, 2c, 2d ... Edge part, 2s ... Inner surface of contact lens, 2r ... Outer surface of contact lens, 3 ... View field, 4a, 4b ... Multi Curve coupling portion (boundary line), 5 ... interference fringes, 10 ... sample stage, 11 ... objective lens, 12 ... light source, 13 ... narrow band filter, 14 ... beam splitter, 15 ... Mirau interferometer, 16 ... CCD camera, 17 ... PZT (piezoelectric element), 18 ... PZT actuator, 19 ... PC (PC), 20 ... measurement object, 21 ... BC (base curve), 22 ... RC (reverse curve), 23 ... AC (alignment curve), 24 ... PC (peripheral curve), 31 ... θx tilt stage, 32 ... θy tilt stage, 33 ... Y direction uniaxial stage, 34 ... Z direction uniaxial stay G, 35 ... X direction single axis stage.

Claims (5)

  Measurement of the three-dimensional surface shape of a contact lens for measuring a three-dimensional surface shape of an inner surface of a contact lens having a shape in which a plurality of regions having different curves are combined and at least a part of a joint portion of each region is blended A button type lens having a processed surface processed into a shape including the plurality of regions and not subjected to the blending at the coupling portion is used as a contact lens holder to be measured. Measuring the three-dimensional surface shape of the contact lens while confirming the boundary of the region of the button-type lens through the contact lens in a state where the contact lens is held on the processed surface of the mold lens. A method for measuring a three-dimensional surface shape of a contact lens.   3. The contact lens three-dimensional surface shape measuring method according to claim 1, wherein the three-dimensional surface shape measurement of the inner surface of the button-type lens is performed using optical interferometry. Shape measurement method.   3. The method for measuring a three-dimensional surface shape of a contact lens according to claim 2, wherein the optical interferometry irradiates the inner surface of the contact lens with light source light condensed by an objective lens through an interferometer, and the objective lens and the contact While scanning the distance from the inner surface of the lens, an interference image generated by the inner surface of the contact lens and the reference light in the interferometer is imaged, and the button type is based on position information that maximizes the contrast of the captured interference image. A method for measuring a three-dimensional surface shape of a contact lens, wherein the three-dimensional surface shape is measured by obtaining height information of an inner surface of the lens.   The method for measuring a three-dimensional surface shape of a contact lens according to claim 3, wherein an edge of each region of the contact lens is specified based on a boundary of the region of the button-type lens confirmed through the contact lens. 3. A contact lens according to claim 3, wherein the position of the contact lens with respect to the interferometer is set for each of the regions based on the specified edge position information, and a three-dimensional surface shape is measured for each of the regions. Dimensional surface shape measurement method.   5. The contact lens three-dimensional surface shape measuring method according to claim 4, wherein an X axis, a Y axis, and a Z axis, which are orthogonal to each other, are assumed, and the optical axis direction of the light source light applied to the contact lens is a Z axis. When measuring each area, the tilt adjustment in the X-axis and / or Y-axis direction, the position adjustment of the Z-axis to the measurement object, and the height adjustment of the measurement object in the Z-axis direction are performed. A method for measuring a three-dimensional surface shape of a contact lens, wherein the measurement of the three-dimensional surface shape is performed after positioning the measurement object.

Images