JP3953351B2 - Progressive multifocal lens for plastic optometry and its mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a progressive multifocal lens for optometry that is used by being mounted on an optometry frame when preparing eyeglasses, and a mold for molding the lens.
[0002]
[Prior art]
In the process of preparing spectacles, after the optometry is completed, a test lens (also referred to as an optometry lens or a trial lens) is tried on an optometry frame (trial frame) and the patient is confirmed (view) a visual field state. There are various types of optometry lenses used there. For example, Japanese Patent No. 3153251 discloses an optometry progression manufactured by an injection molding method in which a holder part, a ring part, and a lens part are integrally molded. A multifocal lens is disclosed.
[0003]
Further, in most cases, the shape of the optometry lens is circular, but there are also vertically and elliptical shapes, and the function of the test lens is a shape that approximates the lens frame shape of the spectacle frame to be mounted. preferable.
[0004]
On the other hand, the demand for fashion is also increasing for glasses, and with the diversification of designs, various lens frame shapes have emerged. A frame having a horizontally long oval shape (lens frame) (hereinafter referred to as a small-diameter frame) has become popular. When such a small-diameter frame is selected, the effective field of view is necessarily limited to the target lens shape.
[0005]
[Problems to be solved by the invention]
When considering a trial, it is preferable to make a trial lens that approximates the lens shape of the frame and corresponds to the target lens shape, but it is enormous in cost and unrealistic. Moreover, the target lens shape of the trial frame is determined in a standard manner, and there is no actual target lens shape trial frame corresponding to the small-diameter frame. Therefore, even if the customer selects a small-diameter frame, the existing trial frame and trial lens are used at the time of the trial, so that there is a significant gap between the actual visual field state and it is easy to feel uncomfortable.
[0006]
In addition, when a progressive multifocal lens with a design that has a short dedicated progressive zone length corresponding to a small-diameter frame appears, how to eliminate the gap in the shape of the current round trial frame with a circular shape It was said.
[0007]
Furthermore, as described above, the trial lens is almost circular except for a special design, and the lens itself is a transparent body. Discrimination was not easy. The present invention has been made to solve such a problem, and an object thereof is to provide a plastic progressive ophthalmic lens suitable for a small-diameter frame and a molding die thereof.
[0008]
[Means for Solving the Problems]
The first means for solving the above-mentioned problem is
A progressive multifocal lens for optometry,
A plastic multi-progressive multifocal lens for optometry, wherein a region near the upper end of the distance portion and a region near the lower end of the near portion are formed so as to be visually distinguishable from other regions.
The second means is
The region near the upper end of the distance portion and the region near the lower end of the near portion are formed so as to have a smaller light transmittance than the other regions. It is a progressive multifocal lens.
The third means is
The region near the upper end of the distance portion and the region near the lower end of the near portion have a rough surface on at least one of the front and back surfaces of the lens. It is a progressive multifocal lens for plastic optometry according to the means.
The fourth means is
The rough surface is a progressive multifocal lens for plastic optometry according to a third means, wherein the rough surface is formed on the convex surface side of the lens.
The fifth means is
A mold for molding a progressive multifocal lens for plastic optometry according to the third or fourth means,
The molding die is characterized in that a sandblasting process is performed on a die surface in contact with the upper end portion of the distance portion and the lower end portion of the near portion of the progressive refractive surface.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a progressive multifocal lens for plastic optometry and a molding die according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plastic progressive ophthalmic lens (hereinafter referred to as an optometry lens) according to an embodiment of the present invention. An optometric lens 48 '' shown in FIG. 1 has a lens portion 48A and a knob portion 48B and an edge portion 48D on the outer periphery of the lens portion 48A.
[0010]
In the embodiment of the optometry lens 48 ″, the lens part 48A has an overall diameter of 38 mm including the edge part 48D, a width dimension of the edge part 48D of 1.5 mm, a diameter of the lens part 48A of 35 mm, and a knob part 48B. The length of the knob is 15 mm, and the width of the knob 48B is 9 mm.
[0011]
First, the lens unit 48A will be described. The lens portion 48A corresponds to the design of a progressive multifocal lens having a layout design with a short progressive zone length. The distance portion E, the near portion F, and these distance E and near portion F And a progressive multifocal lens part having a progressive part G between and an eye point H. A distance smoke portion having a width of 2 mm in the direction orthogonal to the main meridian is formed in a region near the upper end of the distance portion E on the concave surface side or the convex surface side of the lens portion 48A. In the area near the lower end of the near portion F, a near smoke portion is formed with a width of 3 mm.
[0012]
For this reason, the optical layout has a short distance with the upper end of 2 mm as a smoke part, and the progressive zone length is usually 14 mm to 18 mm, 11 mm, the near measurement area is 8 φ, A buffer area with a 0.5 mm near smoke part is provided below, and the near smoke part is set below it with a width of 3 mm.
[0013]
Both the smoke portions are in a state of transmitting light like ground glass, and it is visually understood that the transmittance is clearly different from other lens surfaces. As a result, it is possible to create a state close to the mounting feeling of the small-diameter frame, and it is easy to distinguish from trial lenses of other designs.
[0014]
In the case of the present embodiment, the effective area of the optometry lens is 30 mm vertically, so that it can accommodate a small-diameter frame. The near-use measurement area is 8φ, and its center position is 10 mm below and 2.5 mm to the right from the horizontal reference line of the mark portion, so that the near-use center position exists in this area. It is laid out. On the other hand, the left direction of the center position varies depending on the addition power, and the larger the amount, the larger the inward amount (shift amount to the nose side).
[0015]
Next, the knob 48B will be described. The picking part 48B is a part to be picked by a finger, and at the same time, a left / right distinction display 49 indicating whether the lens part 48A of the optometry lens 48 ″ is for the left eye or right eye, and the lens part 48A of the optometry lens 48 ″. An addition level display 50 representing the addition level is provided. The left / right distinction display 49 is formed by shifting by 45 degrees from the left / right center position of the lens unit 48A to the left or right side depending on whether the lens unit 48A is for the left eye or the right eye. It is provided to indicate whether "" is for the left eye or for the right eye.
[0016]
When the optometry lens 48 ″ is for the left eye, the knob 48B is formed at a position 45 degrees to the left of the lens portion 48A when viewed from the subject wearing the spectacle test frame 24, and the optometry lens 48 ″. Is for the right eye, the knob 48A is formed at a position 45 degrees to the right of the lens 48A as viewed from the subject. Incidentally, the optometry lens 48 ″ of FIG. 1 is for the left eye. Although details will be described later, these indications 49 and 50 are obtained when the knob portion 48B and the lens portion 48A are simultaneously molded by the injection compression molding apparatus. Further, it is formed by stamp marks engraved on members constituting the mold apparatus.
[0017]
Further, the edge 48D will be described. The edge portion 48D is provided on the outer peripheral portion of the lens portion 48A, and is partitioned by a step portion 51 and a groove 52 from the distance portion E and the near portion F of the lens portion 48A. The step portion 51 and the groove 52 portion will be described with reference to FIG. 2 which is a sectional view of the lens portion 48A. As is clear from FIG. 2, the edge portion 48 </ b> D is thicker than the distance portion E via the step portion 51, and is also thicker than the near portion F via the groove 52. . The edge 48D is a substitute for a normal holder ring. Because of this configuration, the optometry lens 48 ″ is lighter because it does not require a holder ring. As will be described in detail later, the edge 48D is formed integrally with the lens 48A and has a knob. Similar to the part 48B, the lens part 48A is molded at the same time.
[0018]
Returning to FIG. 1 again, the edge 48D has marks 53 indicating the direction of the horizontal reference line J on the left and right sides of the lens portion 48A when the lens portion 48A is in the correct vertical direction shown in the drawing. Is formed. These marks 53 are concave portions in which a part of the edge portion 48D is recessed. Although details will be described later, the edge portion 48D and the mark 53 are formed at the same time when the lens portion 48A and the knob portion 48B are formed, and the mark 53 is a convex portion formed on a component of the mold apparatus. Are formed simultaneously.
[0019]
The wearing of the optometry lens 48 ″ according to the present embodiment described above in the spectacle test frame will be described with reference to FIG. 3. FIG. 3 is a perspective view when the optometry lens 48 ″ is loaded into the spectacle test frame 24. It is. In the optometry lens 48 ″, the horizontal direction of the lens portion 48A is known by the mark 53, and the lens portion 48A is clearly for the left eye or the right eye by the knob portion 48B. When loading the test frame 24, the left and right optometry lenses 48 "are distinguished from each other while accurately determining the position in the rotation direction of the lens portion 48A in which each of the optometry lenses 48" is circular. it can. Accordingly, these optometry lenses 48 ″ can be accurately loaded into the spectacle test frame 24. Further, the frequency measurement positions of the distance portion E and the near portion F in the lens portion 48A and the layout of the optical center by the knob portion 48B and the mark 53. In addition, the structure having the edge 48D realizes weight reduction.
[0020]
Hereinafter, the manufacturing method of the optometry lens concerning this Embodiment is demonstrated. The primary injection molded article 48 shown in FIG. 4 is for obtaining a total of ten secondary injection molded articles 48 'for progressive multifocal lenses that are two-dimensionally connected to each other. There are five types of progressive multifocal lenses, each having an addition of 0.5 diopter pitch ranging from 1.00 diopter to 3.00 diopter, and there are two injection molded products 48 'having the same addition of the lens portion 48A.
[0021]
Individual secondary injection molded products 48 ′ are obtained by cutting the tips of the knobs 48 B from the primary injection molded products 48. The obtained secondary injection molded product 48 'is shown in FIG. The secondary injection molded product 48 ′ has a lens part 48A, a knob part 48B, a support part 48C, and an edge part 48D. The knob part 48B is provided with indications 49 and 50, and the edge part 48D is provided with an edge part 48D. A mark 53 is formed. Next, a total of five secondary injection molded articles 48 'are suspended and supported by a support for the coating process. Here, FIG. 5 is a support for coating the secondary injection molded article 48 ′, and FIG. 6 is a cross-sectional view thereof. As shown in FIGS. 5 and 6, the support tool 54 includes a main body 55 in which five grooves 55A into which the rod-like support portion 48C of the secondary injection molded product 48 ′ can be inserted are formed upward from the lower surface. The main body 55 is provided for each groove 55A, and the upper portion includes a clamping member 57 made of a leaf spring fixed to the main body 55 with a screw 56. After the screws 56 are loosened, the support portions 48C of the secondary injection molded products 48 'are inserted into the respective grooves 55A, and then the screws 56 are tightened. It is clamped by 55 and the clamping member 57, and is supported by suspension.
[0022]
The support tool 54 is gripped by the gripping tool 58, and in this state, the secondary injection molded product 48 'is immersed in the hard coat liquid 21 which is a coating processing liquid and then pulled up. This dipping operation is performed with the support 48C facing upward and the knob 48B facing downward. Therefore, in this embodiment, the excess hard coat liquid 21 flowing down along the surface of the lens portion 48A is guided and dropped by the knob portion 48B, and the liquid pool of the hard coat liquid 21 that remains without being dropped. The portion can be a knob 48B. That is, in this embodiment, the knob 48B also serves as the liquid guide reservoir.
[0023]
After the secondary injection molded product 48 'is soaked in this manner, it is heated and dried to form a coating film with a hard coat liquid on the lens portion 48A, and then the support portion 48C is cut and removed. Then, by attaching a label describing the same contents as the indications 49 and 50 displayed on the knob 48B to the knob 48B, the optometry lens 48 ″ shown in FIG. 1 is completed.
[0024]
When the support portion 48C is cut and removed, the support portion 48C has a rod shape extending in the outer diameter direction of the lens portion 48A, and the connection area with the edge portion 48D of the outer peripheral portion of the lens portion 48A is reduced. This cutting operation can be easily performed.
[0025]
The knob 48B, which is also a liquid guide reservoir, is formed on the outer periphery of the lens portion 48A on the distance portion E side of the distance portion E side and the near portion F side of the lens portion 48A. Yes. In any case, when the knob 48B is formed on the outer peripheral portion of the lens portion 48 on the near portion F side, the near portion F is interposed between the near portion F and the edge portion 48C as described in FIG. This is because the groove 52 corresponding to the cross-sectional shape is formed, and the hard coat liquid accumulates in the groove 52 when the hard coat liquid is pulled up, which affects the optical accuracy of the lens portion 48A. However, according to the present embodiment, the occurrence of such a problem can be prevented.
[0026]
Next, a method for creating a sandblasting mold according to the present embodiment will be described for each operation step.
[0027]
(Step 1: Preparation of protective tape)
As a protective tape for masking the optical surface of a mold whose optical surface is polished to a mirror surface (surface roughness (Rmax) of about 0.020 to 0.030 μm), a first tape of 12 mm width and the others A second tape that covers the mold surface is prepared. As the first tape, a solvent-resistant protective tape (for example, Tepla tape) that is strong against an organic solvent used for cleaning with acetone or the like is used. The second tape is not as resistant to solvent as the first tape, and may be one that can be coated with a mold (for example, a silver tape).
[0028]
(Step 2: Masking process)
Affix the first tape leaving 2 mm at the top of the distance part of the mold. Next, similarly, a 1st tape is affixed leaving 3 mm of the lower end of the near-use part of a metal mold | die. And a 1st tape is affixed on the residual area | region of the intermediate part of a distance part and a near part. Finally, the side surface and back surface of the mold are covered with the second tape to complete the coating of the mold.
[0029]
(Step 3: Sandblasting)
A sandblast gun is used for the upper end part for distance and the lower end part for near end of the mold exposed in step 2, and a mixed gas of abrasive and air containing brown alumina as a main component is sprayed. The protrusion pressure of air is preferably 0.6 to 1.0 MPa (6 to 10 kgf / cm 2), and the time is 2 to 5 seconds.
[0030]
(Step 4: Remove the protective tape)
In the above process, the far-end upper end surface and the near-end lower end surface of the mold are in a state where the abrasive is attached. Therefore, in order to remove it, the abrasive is wiped off with acetone while the protective tape is stuck. At that time, wipe off from the center toward the outer periphery, and be careful not to stain or damage other surfaces. When wiping is complete, remove all the protective tape on the front, side, and back of the mold. In this way, a mold 90 as an optical insert having the sandblast processing section 91 as shown in FIG. 7 is manufactured.
[0031]
FIG. 8 is a diagram showing the surface roughness (Rmax) of the mold in the sandblast processing section 91, which is measured by Talisurf of Bobson Taylor. The surface roughness of the sandblasted surface is around 5 μm. If the surface roughness is 1 μm or less, the surface roughness becomes thin due to the wear-resistant organic hard coat treatment (2 to 4 μm) applied in the subsequent process, and the masking effect is reduced. On the other hand, when the surface roughness is too large, the molded product is too close to the mold in the mold release step of injection molding, and smooth mold release is not performed, which is not preferable because it causes molding defects. Although it depends on the characteristics of the molding resin, it is estimated that it is not preferable to exceed 10 μm.
[0032]
9 and 10 show a mold apparatus of an injection compression molding apparatus for molding the primary injection molded article 48 shown in FIG. This mold apparatus has an upper mold 61 and a lower mold 62 that are divided from a parting line PL. The upper die 61 includes an inner insert member 63, an outer insert member 64 disposed outside the inner insert member 63, and a back disposed on the rear side of the inner insert member 63, in other words, above the inner insert member 63. An insert 65 is included. The lower mold 62 includes an inner insert member 66, an outer insert member 67 that is disposed outside the inner insert member 66, and houses the inner insert member 66 in the hole 67A, and a rear portion of the inner insert member 66. In other words, it includes a wall thickness adjusting spacer 68 disposed below the inner insert member 66 and between the inner insert member 66 and the outer insert member 67.
[0033]
The inner insert member 63 of the upper die 61 and the inner insert member 66 of the lower die 62 are vertically opposed, and the outer insert member 64 of the upper die 61 and the outer insert member 67 of the lower die 62 are also vertically opposed. The insert 61A of the upper die 61 is formed by the inner and outer insert members 63 and 64 of the upper die 61, and the insert 62A of the lower die 62 is formed by the inner and outer insert members 66 and 67 of the lower die 62. The pair of upper and lower inserts 61A and 62A has the same number of sets as the secondary injection molded product 48 'in the primary injection molded product 48 shown in FIG. 4, and the upper mold 61 and the lower side 62 are clamped. Cavities 69 are formed between the pair of upper and lower inserts 61A and 62A in each pair, and these cavities 69 include a lens part molding part 69A, a knob part molding part 69B, and a support part molding part 69C. Including.
[0034]
The lens part molding part 69A is formed between the inner insert members 63, 66 of the upper and lower molds 61, 62, and the knob part molding part 69B and the support part molding part 69C are the outer insert members 64, It is formed between 67. Further, a stamp mark member 70 is disposed at a position corresponding to the knob forming part 69B in the outer insert member 67 of the lower die 62, and the lens part 48A, the knob part 48B, FIG. When the support portion 48C is molded, the indications 49 and 50 are provided on the knob 48B by the marking mark member 70.
[0035]
Further, the outer insert members 64 and 67 of the upper and lower molds 61 and 62 are formed with recesses 64A and 67A. When the cavity 69 is filled with the molten resin by these recesses 64A and 67A, as described with reference to FIG. Since the edge portion 48D instead of the holder ring is formed on the outer peripheral portion of the lens portion 48A, a space between these concave portions 64A and 67A is an edge portion forming portion 69D of the cavity 69. Furthermore, the lower mold 62 outer insert member 67 is provided with a projection for forming the mark 53 by the concave portion of FIG.
[0036]
As shown in FIG. 9, the back insert 65 of the upper die 61 is integrally provided with a male screw portion 65A extending downward, and the male screw portion 65A is screwed into the female screw hole of the inner insert member 63, thereby The inner insert member 63 is coupled. Further, as shown in FIG. 10, the inner insert member 66 of the lower mold 62 is coupled to the outer insert member 67 with bolts 71.
[0037]
The lens portion 48A molded by the lens portion molding portion 69A of the cavity 69 is a meniscus lens in which one surface is a concave surface formed by a spherical surface and the other surface is a convex surface formed by an aspheric surface. The concave surface of the lens portion 48A formed by the inner insert member 63 of the upper die 61 is the same curved surface for the progressive multifocal lenses having different addition powers, but the lens formed by the inner insert member 66 of the lower die 62 The convex surface of the part 48A must be a different curved surface for progressive multifocal lenses having different addition powers. Therefore, in the mold apparatus according to this embodiment, as described above, five types of inner insert members 66 are used to mold five types of progressive multifocal lenses, and these inner insert members 66 are used as outer insert members 67. The inner insert member 66 is positioned on the outer insert 67 with the positioning pins 72 shown in FIG. 10 in order to accurately position and set in the direction of rotation about the vertical axis.
[0038]
The upper mold 61 is divided into upper and lower portions from the boundary portion KK between the mold plate 73 and the mold plate 74, and when the upper mold 61 and the lower mold 62 are clamped, the lower portion from the mold plate 73 On the other hand, the upper part of the mold plate 74 can be moved up and down by the mold clamping cylinder and other cylinders by the amount of compression. Since the back insert 65 and the inner insert member 63 of the upper mold 61 are members joined to the template 74 as apparent from FIG. 9, the back insert 65 and the inner insert member 63 are integrated with the template 74. It moves up and down.
[0039]
When molten resin is injected from the injection nozzle 80 shown in FIG. 9 of the injection compression molding apparatus while the upper mold 61 and the lower mold 62 are clamped, the molten resin is sprue 81 and runners inside the mold apparatus. Each cavity 69 is filled via 82 and further through the gate 83. At this time, the back insert 65 and the inner insert member 63 are raised by the compression allowance, and after the molten resin is filled into the cavity 69, the back insert 65 and the inner insert member 63 are lowered, thereby the upper die 61 and the lower die The molten resin that is gradually cooled and solidified by the temperature adjusting fluid passed through the 62 fluid circulation passages 84 is compressed.
[0040]
After the injection molded product 48 of FIG. 4 is formed by solidification of the molten resin, the upper mold 61 and the lower mold 62 are opened from the parting line PL, and the injection molded product 48 attached to the upper mold 61 side is It is ejected by a pin 87 of an eject plate 86 pushed down by a bar 85 of the eject cylinder.
[0041]
Thus, the primary injection molded article 48 taken out from the mold apparatus is provided with ten secondary injection molded articles 48 ', and each secondary injection molded article 48' has been described with reference to FIG. It has a configuration.
[0042]
As shown in FIG. 9, a knob portion molding portion 69B for molding the knob portion 48B in the cavity 69 includes a gate 83 that is an inflow portion of molten resin into the cavity 69, and a lens portion molding portion of the cavity 69. It is formed between 69A. Therefore, when the molten resin flows from the gate 83 toward the cavity 69, the molten resin is filled into the lens portion molding portion 69A through the knob portion molding portion 69B, and in the resin portion close to the gate 83, the molten resin is filled. However, this distortion occurs in the resin part filled in the knob part molding part 69B, and no distortion occurs in the resin part filled in the lens part molding part 69A. Can be secured.
[0043]
The inserts 61A and 62A, which are disposed on the upper die 61 and the lower die 62 to form a pair, are composed of inner insert members 63 and 66 and outer insert members 64 and 67, and the inner insert members 63 and 66 are used to form a lens portion molding portion. 69A is formed and the outer insert members 64 and 67 are formed with the knob portion forming portion 69B, etc., so that the type, frequency, thickness, etc. of the lens portion 48A are different, and this is formed on the outer periphery of the lens portion 48A. When producing a plurality of types of optometry lenses that include the picking portion 48B integrated with the lens portion 48A, it is only necessary to replace the inner insert members 63 and 66, and the outer insert members 64 and 67 are used for various optometry lenses. Can be shared.
[0044]
FIG. 12 is a distribution diagram of astigmatism of the secondary molded product described above. From this result, it is shown that even if the sand blasting process is performed on the mold, this process does not affect the other optical surfaces of the mold and a good injection molded product is obtained.
[0045]
(Modification)
In the examples, sandblasting was performed on the mold in order to form a ground glass-like smoke portion on the molded product. However, the method of forming the smoke portion is not limited to the sandblasting process, and any method may be used as long as the transmitted light is made to be visually different between the optical portion and the non-optical portion. For example, as a modified example, it is also possible to form a smoke portion by applying a translucent tape directly to the molded product or by treating with a chemical. Further, the smoke portion may be a fine concave surface and / or a convex surface.
[0046]
【The invention's effect】
As described above in detail, the present invention is a progressive multifocal lens for optometry, in which a region near the upper end of the distance portion and a region near the lower end of the near portion are visually distinguished from other regions. It is possible to provide a progressive multifocal lens for optometry suitable for a small-diameter frame, and can be differentiated from other progressive multifocal lenses with different designs, lens design and layout. Can be easily distinguished.
[Brief description of the drawings]
FIG. 1 is a progressive multifocal lens for plastic optometry according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the optometric lens according to FIG.
FIG. 3 is a perspective view when an optometric lens is loaded into a spectacle test frame.
FIG. 4 is a primary injection molded product according to an embodiment of the present invention.
FIG. 5 is a support for coating the secondary injection molded article shown in FIG.
6 is a cross-sectional view of FIG.
FIG. 7 is a mold as an optical insert.
FIG. 8 is a diagram showing the surface roughness (Rmax) of a mold after sandblasting.
9 is a mold apparatus of an injection compression molding apparatus for molding the primary injection molded product shown in FIG.
10 is a mold apparatus of an injection compression molding apparatus for molding the primary injection molded product shown in FIG.
FIG. 11 is a secondary injection molded product according to the embodiment of the present invention.
FIG. 12 is a distribution diagram of astigmatism of the secondary injection molded product shown in FIG.
[Explanation of symbols]
24. Glasses test frame 48 ″. Optometry lens 48A. Lens part 48B. Pick section 53. Mark E. Distance part F. Near part

Claims (7)

An optometry lens having a lens part and a knob provided on the outer periphery of the lens part,
The lens part is a progressive multifocal lens having an optical layout having a distance part, a near part, and a progressive part between the distance part and the near part,
A progressive multifocal lens for plastic optometry, wherein the near portion is made to have different transmittances so that the region near the lower end and the other region can be visually discriminated from each other. .   The progressive multifocal lens for plastic ophthalmic examination according to claim 1, wherein the region near the lower end of the near portion has a smaller light transmittance than other regions.   3. The plastic according to claim 1, wherein the distance of the distance portion is made different from each other so that a region near the upper end and a region other than the distance portion can be visually distinguished from each other. Progressive multifocal lens for eye making.   The progressive multifocal lens for plastic optometry according to any one of claims 1 to 3, wherein the length of the progressive portion is 11 mm. The region near the upper end of the distance portion and the region near the lower end of the near portion have a rough surface on at least one of the front and back surfaces of the lens . A progressive multifocal lens for plastic optometry according to any one of the above.   6. The progressive multifocal lens for plastic optometry according to claim 5, wherein the rough surface is sandblasted.    A molding die for molding the progressive ophthalmic lens for plastic optometry according to claim 1, wherein the molding surface in contact with the lower end portion of the near portion is subjected to sandblasting. Type.

Images