WO1987002477A1 - Systeme composite de lentilles ophthalmiques - Google Patents

Systeme composite de lentilles ophthalmiques Download PDF

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Publication number
WO1987002477A1
WO1987002477A1 PCT/US1985/002011 US8502011W WO8702477A1 WO 1987002477 A1 WO1987002477 A1 WO 1987002477A1 US 8502011 W US8502011 W US 8502011W WO 8702477 A1 WO8702477 A1 WO 8702477A1
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WO
WIPO (PCT)
Prior art keywords
lens
ophthalmic
correction
additive
lenses
Prior art date
Application number
PCT/US1985/002011
Other languages
English (en)
Inventor
Robert L. Cotie
Original Assignee
C & H Contact Lens, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US06/528,606 priority Critical patent/US4547049A/en
Application filed by C & H Contact Lens, Inc. filed Critical C & H Contact Lens, Inc.
Priority to PCT/US1985/002011 priority patent/WO1987002477A1/fr
Priority to EP19850905555 priority patent/EP0240492A1/fr
Publication of WO1987002477A1 publication Critical patent/WO1987002477A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/16—Laminated or compound lenses

Definitions

  • the invention relates to a multi-element ophthalmic lens system, and more particularly, to a method of and apparatus for a multi-element laminated ophthalmic lens system comprised of a rigid primary lens and at least one thin, pliable, additive lens having an initially non-mating cur ⁇ vature, pre-selected because of its radial difference and flexibly bonded thereto.
  • indivi- dual ophthalmic lenses having both a spherical and a cylindrical correction.
  • the power of such lenses is generally measured in diopters (D) which is the inverse of the focal length in meters.
  • D diopters
  • the power of the human eye, including both the cornea and lens is about +60D.
  • Spherical lenses are generally made with powers between -7.00D and +7.00D, usually in 0.25D steps.
  • Cylindrical len ⁇ ses are made in powers up to 4.00D, also in 0.25D incre ⁇ ments.
  • the necessary optical corrections for the aforesaid ophthalmic lens provide an enormous stocking problem in that each configuration must be available for a complete ophthalmic inventory.
  • An inventory of ophthalmic lenses is generally provided in a large variety of spherical cylindri ⁇ cal and bifocal combinations. There are approximately one hundred and twenty spherical powers, thirty cylindrical powers, and 180° of possible axial combinations which are conventionally prescribed by ophthalmic practitioners for eye glasses. Additionally, about twelve bifocal powers are generally utilized.
  • the inventory requirements to provide immediate availability for any one of the aforesaid com- binations is often times prohibitive. Therefore, the most often required lens configurations are stocked and the more seldom needed lens ordered from a lens manufacturer.
  • the conventional manner of fabrication of ophthalmic lenses generally includes the casting/grinding and polishing of single layer plastic or glass stock. Such fabrication techniques require expensive machinery, knowledgeable arti ⁇ sans and appropriate manufacturing facilities which are not readily available to individual ophthalmic practitioners. It may be seen that the complex curvatures required for co - bined spherical and cylindrical optic correction are accomplished by superimposing the curvature of one distinct lens onto another. Such techniques may be affected, by lens grinding machines which geometrically impose optical com ⁇ binations onto a single lens blank. It is likewise possible to segregate the distinct optical patterns from one another in the lens manufacture, in that said optical patterns are initially segregated in the prescription.
  • the step quickly and permanently changes one or more optical characteristics of the spectacle lens to pro ⁇ vide a change in the spectacle transmission across the field of view and/or the following: changing the light transmission to all colors by partial or entire occlusion with stenopaic slit, pin holes of uniform or varying size distributed either uniformly or stepwise or graded across the field, changing the light transmission either by uniform or graded diffusion, or a combination of each of the listed ways.
  • the subject prior art Fresnel type membrane may be embossed on one of its surfaces to form a Fresnel type lens or prism structure which introduces a deviation of the light ray for ophthalmic correction.
  • the utilization of the Fresnel lens affords a distinct refractive power for ophthalmic correction in a lens assembly of reduced thickness.
  • This construction has an additional light weight feature which benefits the user.
  • Such a combination also reduces the manufacturing costs typical of conventional single layer lenses of the equivalent ophthalmic correction.
  • the telemicroscope reference and the aforesaid ophthalmic Fresnel lens references clearly show the interest placed upon laminated lens constructions by various prior art procedures. More conventional ophthalmic innovation in laminate lens construction also has surfaced for conven ⁇ tional ophthalmic lenses incorporating the combination for basic spherical, cylindrical and related corrections. More particularly, one laminate construction of two-ply lenses is shown in U. S. Patent No. 1,948,636 issued to Tillyer. The lens assembly of the Tillyer patent teaches that a laminate lens construction may be provided by grinding adjacent sur ⁇ faces of the laminate lenses into a mating configuration. The matingly curved surfaces are then cemented together in a non-conforming, non-flexible configuration. Such an assembly affords the advantages, however, of a laminate construction although the necessity of mating curvatures must be met.
  • the second Tillyer patent discloses a lami ⁇ nate lens construction not requiring mating curvatures of bonded lenses.
  • the lenses are also not conformed to each other.
  • the lenses are cemented together along the circumferential periphery so as to seal the lens and the void therebetween.
  • the individual lens laminates are thus rigid and structurally inflexible for facilitating circumferential bonding and the predetermined optical correction afforded by the pre-selected lens ele- ments.
  • U. S. Patent No. 3,387,798 issued to Tolar This patent teaches again pre-grinding of lenses to specific curvatures for mating. It is an object of the Tolar patent to provide a laminated, multi-focal lens assembly of improved appearance which is thin, light in weight, and strong.
  • the laminated lens which is set forth in the Tolar patent again comprises structurally rigid, laminated lens elements. Each lens element is constructed with sufficient structural rigidity to maintain the specific mating curvature necessary for lamination.
  • the laminate lens system set forth in Tolar then provides the ability to meet a myriad of ophthalmic corrections with a pre-selected inventory.
  • the inventory of laminatable lenses is, however, by definition an inventory of lenses having pre-ground, mating surface curvatures and of sufficient structural rigi ⁇ dity to permit subsequent bonding to provide the afore- described thin, lightweight lens.
  • the present invention provides such a laminated lens system by providing a plurality of lens blanks having a series of cylindrical or spherical additive lens in gra ⁇ duated, radial differences for creating any given refractive power depending upon the lens curvature to which it is con ⁇ formed and affixed.
  • the flexible additive lenses of the present invention are constructed of a curvature specifi ⁇ cally different from the curvature of the lens to which it will be bonded and are provided in graduated radial dif ⁇ ferences rather than ophthalmic powers in that the resulting ophthalmic power is determined by the specific radial dif ⁇ ference as applied to the primary structural lens.
  • the present invention utilizes a thin, pliable lens which may be flexibly con ⁇ formed to the structural lens, negating the need for struc- tural rigidity in the additive lens and the necessity of pre-ground mating surfaces.
  • the present invention relates to an ophthalmic lens system which includes the provision of a rigid, primary lens and at least one thin pliable additive lens of basic ophthalmic design, having an initial non-mating curvature for flexible bonding thereto.
  • the pre ⁇ sent invention includes an additive lens system for ophthalmic use in treating varying vision deficiencies or needs of the human eye.
  • the apparatus includes a first structural lens of predetermined optical prescription for treating a first ophthalmic deficiency.
  • a second, additive lens of predetermined optical prescription, formed of thin, pliable light transmitting plastic is selected from a series of lenses for treating an additive eye deficiency and/or need.
  • the series of additive lenses is provided in prede ⁇ termined radial differences having.
  • the invention comprises a laminated ophthalmic lens wherein a primary spectacle lens is provided with a spherical correction of positive or negative diopter power.
  • the additive lens comprises a thin, cylindrical lens having a pre-selected radial difference bonded to the pri ⁇ mary lens with the necessary axial alignment.
  • a bifocal lens may be incorporated into the primary lens.
  • the invention includes a method of correcting optical deficiencies of the eye in accordance with a prescription correction comprising the steps for determining a first, spherical or cylindrical correction prescription for a first optical deficiency and then deter ⁇ mining the requisite radial difference for a second spheri ⁇ cal or cylindrical correction to be added thereto.
  • a plurality of structurally rigid spectacle lens blanks having a series of either cylindrical or spherical powers are pro ⁇ vided in pre-defined graduations.
  • a plurality of additive lenses of basic ophthalmic design having a plurality of spherical, cylindrical, or prismatic radial differences to create any given refractive power for a particular spectacle lens curvature are also provided in pre-defined graduations.
  • Each of the additive lenses comprises a single, light refractive element formed of thin, pliable light transmitting plastic material having a curvature different from that of the spectacle lens and adapted for flexibly conforming to and bonding with one of the spectacle blanks.
  • a first spectacle lens is then selected having the deter ⁇ mined spherical or cylindrical correction.
  • a second addi ⁇ tive lens is then selected having the determined spherical or cylindrical radial difference needed for providing the desired correction when flexed into mating conformity with the first lens.
  • the second lens is then conformed and bonded to the first, spectacle lens and the pre-selected radial difference incorporated therein. Additional additive lenses providing color, prism and surface conditioning may also be combined therewith.
  • FIG. 1 is a perspective view of a pair of eye glasses incorporating one embodiment of the method and apparatus of the present invention
  • FIG. 2 is a partial, cross-sectional, exploded view of one lens of the eye glasses of FIG. 1, taken along lines 2-2 thereof;
  • FIG. 3 is a cross-sectional view of the assembled lens of FIG. 2;
  • FIG. 4 is a partial, cross-sectional view of the other of the two lenses of FIG. 1 taken along lines 4-4 thereof; and
  • FIG. 5 is a diagrammatic, perspective view of one embo ⁇ diment of an assembled lens in accordance with the prin ⁇ ciples of the present invention.
  • FIG. 6 is a radial difference chart constructed in accordance with the principles of the present invention for selection of an additive lens relative to the necessary radial difference to be applied to the specific curvature of the structural lens;
  • FIG. 7(a) through 7(c) are diagrammatic illustrations of the three bonding steps of the present invention wherein an additive lens selected from the chart of FIG. 6, having an initial curvature different than that of the structural lens, is flexibly mounted thereon and bonded thereto.
  • FIG. 6 is a radial difference chart constructed in accordance with the principles of the present invention for selection of an additive lens relative to the necessary radial difference to be applied to the specific curvature of the structural lens;
  • FIG. 7(a) through 7(c) are diagrammatic illustrations of the three bonding steps of the present invention wherein an additive lens selected from the chart of FIG. 6, having an initial curvature different than that of the structural lens, is flexibly mounted thereon and bonded thereto.
  • DETAILED DESCRIPTION Referring first to FIG. 1, there is shown a pair of spectacles, or eye glasses 10 which includes a pair of ophthalmic lenses 12 and 14 carried in a spectacle frame 16.
  • the eye glasses 10 include a central bridge portion 18, curved rim portions 15 and 17 and side frames 19 and 20.
  • the lenses 12 and 14 are each constructed in accordance with one embodiment of the method and apparatus of the present invention to provide an improved laminated lens system for accommodating deficiencies of the human eye.
  • the system of the present invention addresses the more commonly found defi ⁇ ciencies of the human eye with an improved approach to ophthalmic lens fabrication.
  • One common defect of the eye is the inability of the eye to focus clearly on very distant or very close objects. This deficiency is referred to as myopic and hypermetropic, respectively.
  • myopic eye the eyeball is longer than normal which requires a spherical correction (-D) .
  • the hypermetropic eye is, likewise, too short and a positive spherical correction is needed.
  • a third common deficiency is astigmatism in which a point source forms a line image on the retina of the eye.
  • Astigmatism of the eye may be caused by imperfect spherical surfaces of the cornea or crystalline lens.
  • an eyeglass lens is utilized that has a compen ⁇ sating cylindrical curvature which is properly oriented relative to the eye.
  • a fourth common malady is the inabi- lity of the eye to accommodate for changes in distance. This condition of the eye wherein the muscles are able to add only a few diopters of power to the crystalline lens of the eye which, often through aging, becomes hypermetropic, is referred to as presbyopia.
  • the correction is a bifocal lens.
  • Each of these deficiencies is separately determined by an ophthalmic practitioner in an eye examination. When these deficiencies appear together, they require separate optical corrections in the corrective lens.
  • bi-optical deficiencies is used herein to refer to the existence of two or more of the aforesaid ophthalmic con ⁇ ditions at one time.
  • the corrective lenses of the eye glasses or spectacles then combine the individual correc ⁇ tions into a single lens assembly for bi-optical correction.
  • the lens 12, which incor ⁇ porates the corrections for bi-optical deficiencies may thus include spherical, cylindrical, bifocal, prismatic and color corrections and additions.
  • the prior art as set forth in the Background of the Invention, generally provides such optical corrections by integrating the separate geometric configurations of the individual correction prescription.
  • the integration is generally effected by either superimposing each geometric configuration onto a single lens blank which is ground and polished in accordance therewith or lamination of structurally rigid, pre-ground lens elements of mating curvature.
  • the above has been the subject of much prior art development and interest as discussed above.
  • the prescription integration is, however, performable as set forth herein without such complex machi- nery or immense inventory of pre-ground lens blanks of mating curvature.
  • the lenses 12 and 14 of FIG. 1 will be shown to comprise the same integrated prescription as com ⁇ parable lenses which are conventionally ground as laminated but assembled from non-mating elements, defined by their radial differences.
  • the lens 12 may be seen to be a multi-element ophthalmic device formed by the bonding together of two lens elements of basic ophthalmic design, each providing a separately definable basic optical correc ⁇ tion.
  • the term basic ophthalmic design as used herein refers to fundamental optical correction elements such as spherical, cylindrical, prismatic and bifocal lenses having a smooth, continuous, optical refractive surface. These relatively low diopter, conventional eyeglass lenses are to be distinguished from the non-basic ophthalmic lens such as a Fresnel lens requiring relatively high diopter correc ⁇ tions.
  • a first or primary, struc ⁇ tural lens 22 is provided with externally smooth surfaces. for ed by conventional casting/grinding and polishing and embodies in itself all or part of the spherical or cylindri ⁇ cal correction needed for the lens assembly 12. In some situations, this could be a zero correction.
  • the separate lens element 24 is a thin, pliable, additive lens provided for flexibly bonding to the primary lens element 22 (shown herein as a spherical lens) for a secondary ophthalmic correction which is shown in this Figure as a cylindrical correction. The cylindrical correction is enlarged for pur- poses of illustration. In some instances, this too could be a zero correction.
  • the additive lens 24 comprises one of a series of thin, pliable plastic members provided in gra ⁇ duated radial differences as will be described in more detail below.
  • the additive lens 24 is constructed of light- weight optical grade plastic of sufficient thinness to per ⁇ mit its flexing and mating conformance to a surface having a different curvature. Most conventional materials are too brittle for such a construction. For example, polycarbonate lenses or glass lenses, although capable of being specifi- cally ground for mating curvatures as is conventional and prior art laminate constructions, are too brittle for any sufficient degree of flexing.
  • CR-39 is an ophthalmic grade plastic to which has been added poly ethylmethacrylate (PMMA) .
  • PMMA poly ethylmethacrylate
  • Such a plastic com- position would constructed in sufficiently thin, cross- sectional configurations as will be described below.
  • PMMA polymethylmethacrylate
  • the use of polymethylmethacrylate (PMMA) itself, may be uti ⁇ lized in accordance with the principles of the present invention when coated with an appropriate scratch resistent coating with such an additive lens construction, the thickness of the primary lens 22 will not necessarily be reduced substantially beyond that of conventional lenses.
  • the thickness of the primary lens 22 is only limited by the combined thickness of the lenses 22 and 24 and/or other additive lens elements, which by definition are substan ⁇ tially thin in cross-section.
  • the additive lens 24 of the present invention includes not only a thin, pliable construction with a curvature substantially different from that of the primary lens, but with a smoothly formed, continuous, opposed surfaces comprising a single light refractive element.
  • FIG. 3 there is shown the assembled lens 12 of FIG. 2.
  • the bi-optical lens therein formed affords the user the benefit of the spherical correction in a primary lens 22 and the necessary additive correction of lens 24.
  • the basic additive correction of the additive lens 24 can also include color as well as other basic ophthalmic corrections.
  • other additive lenses may be added to the assembly to accomplish the desired result.
  • these combinations are readily producible from a relatively small lens inventory of specific primary and additive configurations. Radial differences sufficient to provide spherical lens graduations on the order of 0.25D and cylindrical lens graduations on the order of 0.25D have been found to be generally acceptable. Such a method utilizing radial differences as the selection parameter for the addi ⁇ tive lens will be seen to save an ophthalmic practitioner space, time and money and afford the user the benefit of specialized lens fabrication by the practitioner at the time of purchase.
  • FIG. 4 there is shown a second ver ⁇ tical, cross-sectional of the bi-optical lens 12 of FIG. 1. It may be seen that the thickened edge portions of the flexible, cylindrical lens 24 bonded to spherical lens 22 is not seen in this particular view. This is due to the angu ⁇ lar orientation of the lens 24 relative to lens 22 for astigmatism correction. The angular orientation is, of course, an aspect of lens assembly. The additive lens 24 is thus oriented to lens 22 during assembly and pursuant to the correction prescription.
  • FIG. 5 there is shown a perspective, diagrammatical illustration of an assembled, bi-optical lens 12.
  • the additive lens 24 is shown, in phantom, bonded to primary lens 22.
  • the angular orientation of the additive lens may be seen in more detail.
  • the angular orientation of concern is that of the cylindrical lens 24.
  • the cylindrical lens 24 incorporates edge portions embodying the requisite radial difference for creating the ophthalmic correction necessary for the optical prescription.
  • Selection of the requisite lens must take into account the curvature of the surface of the structural lens 22 to which the flexible additive lens 24 will be applied.
  • the cur ⁇ vatures of the back face, or bonding surface, of structural lenses will vary. Therefore, the resulting power of ophthalmic correction for the lens assembly will vary in accordance with the resulting laminate curvature of the additive lens and its radial difference.
  • the additive lens curve defined as the radial difference is distributed across the spherically curved surface of the primary lens to provide the requisite optical correction. Selection of the appropriate radial difference is then determined by knowing the curvature to which the additive lens will be applied and the necessary corrective power. Unlike prior art additive lens systems, this method and apparatus will greatly reduce the requisite inventory for the practitioner and eliminate the criticality of mating curvature tolerances.
  • FIG. 6 there is shown a radial dif- ference chart constructed in accordance with the principles of the present invention for cylindrical corrections.
  • radial differences of the additive lens is charted relative to the curvature of the structural lens to which it is to be affixed with the resulting refractive power indicated therebetween.
  • the vertical column of the chart thus shows a series of additive lenses having a pre ⁇ determined radial difference in millimeters indicated thereon.
  • the top, horizontal section of the chart indicates the curve in diopters of the surface of the structural lens to which the additive lens will be applied.
  • the refractive powers are then indicated in the boxes between the orthogo ⁇ nal reference sections.
  • a chart such as FIG. 6 may refer to either cylindrical or spherical powers of additive lenses as both are equally applicable. This is possible in accordance with the present invention because it is the refractive power that the ophthalmic prescription denotes, rather than radial difference.
  • a par ⁇ ticular value of the system of the present invention is thus the correlation of refractive power with radial difference in order to minimize the number of additive lenses necessary for supplying an ophthalmic practitioner.
  • the prin ⁇ ciples of the present invention address the critical func ⁇ tional element of an additive ophthalmic lens, assembly.
  • the refractive index the refractive index
  • the center thickness the difference between front and back curves of the lens.
  • Prior art additive lenses address only the latter element by providing a pre-ground additive lens not adapted for flexibly conforming to a structural lens. It is known by those skilled in the art that flexing a lens, as shown in FIG. 2, changes the refractive power, both of the lens 24 and the assembly.
  • the resulting refractive power of a flexed lens may be established as set forth in the chart of FIG. 6.
  • the pre ⁇ sent invention addresses specifically the manner in which conventional lenses are made and the types of ophthalmic correction necessary to meet a practitioner's need for ophthalmic prescriptions.
  • a chart such as that shown in FIG. 6, is used to select the proper radial difference to create the desired refractive power on any given curve.
  • any existing lens can be modified unlike prior art approaches necessitating mating curvatures.
  • D dioptic value of the inside curve of base lens
  • P final refractive power of additive lens
  • CT center thickness Utilizing the above formula (A) , the center column of six diopter power may be established for the most desirable refractive powers, .25D, .50D, .75D, and 1.0D and those powers therebetween.
  • the refractive power for each radial difference deter ⁇ mined by the above formula B may then be inserted in the chart for use by an ophthalmic practitioner.
  • the radial lenses may then be supplied in the pre-defined radial dif ⁇ ferences for bonding to the subject structural lens.
  • the additive lens is constructed with a curvature different from and preferably greater than that of the structural lens.
  • FIG. 7(a) through 7(c) there is shown the assembly of such an additive lens to a structural lens. It is pointed out that the thickness of the additive lens is shown to be enlarged for purposes of illustration and that the relative sizes therebetween are presented in an illustrative fashion only.
  • the additive lens 24 is shown with a curvature on the order of 7.25 diopters for bonding to a structural lens having a back face curvature of six diopters. The data of radial differences provided in the chart of FIG.
  • the lens 24 and chart 6 is constructed with that pre-defined additive lens curvature, although the lens 24 and chart 6 could utilize other curvatures.
  • the central portion of the lens 24 engages the structural lens 12 first with the edge portions conformed thereto in an out- wardly radiating pattern.
  • a conventional laminate lens bonding agent is provided between the structural and addi ⁇ tive lens for purposes of ophthalmic bonding.
  • the edge thickness of an additive lens as applied to a structural lens may be determined by addressing the sagittal depth of the lens, itself. Sagittal depth is determined by the formula:
  • S D sagittal depths
  • the total edge thickness for the resulting additive lens as applied to a structural lens in accordance with the present invention would be on the order of one millimeter with a .2 millimeter center thickness.
  • the standards for ophthalmic lenses call for a tolerance of plus or minus .12 diopters with one diopter of warp.
  • the three fractors that create refractive power are the index of refraction, the center thickness, and the difference between the front and back curves.
  • the only variation will be in the radial dif ⁇ ference between the curves. Therefore, it is the object of the present invention to specify the radial difference and, by doing so, the only major area of intolerance is controlled.
  • the present invention addresses the specific area of the additive lens which per ⁇ mits flexing while maintaining the desired ophthalmic correction.
  • the ophthalmic prescription is analyzed, and the curvature of the structural lens to be corrected is recorded.
  • the curvature of the back surface or bonded sur ⁇ face of the structural lens determines the area of use of the appropriate chart such as that shown in FIG. 6.
  • the applicable vertical column is then selected in accordance with the back curvature of the structural lens and the nearest refractive power is located.
  • the additive lens, having the radial difference for the appropriate refractive power, is then selected and bonded to the lens as shown in FIG. 7(a) through 7(c).
  • the chart of FIG. 6 illustrates cylindrical additive lenses which, when applied, will pro ⁇ vide the construction shown in FIG. 5 of a spherical lens with a cylindrical lens bonded thereto.

Abstract

Procédé et appareil pour un système de lentilles à éléments multiples associant des différences radiales préselectionnées de lentilles ophthalmiques séparées à courbures non adaptées sous forme d'un seul ensemble stratifié à conformation souple. Le système comporte un élément de lentille primaire (22) possédant une rigidité structurale et au moins une lentille additionnelle (24) possédant une forme courbe initialement non adaptée, formée d'une matière plastique mince et souple afin de permettre une correction ou addition ophthalmique complémentaire après avoir subi une conformation souple au premier élément et après collage sur ce dernier. La lentille assemblée (14) est donc capable de présenter pratiquement toute correction ou addition optique grâce à la sélection et à l'application de la lentille (24) additionnelle appropriée qui possède la différence radiale requise. De cette manière la gamme de produits ophthalmiques utilisés par les praticiens peut être réduite par l'utilisation d'une série de lentilles additionnelles (24) caractérisées par des différences radiales graduées, qui peuvent être collées sur toute lentille ophthalmique parmi un ensemble de lentilles à configuration caractérisée par des courbures initiales différentes. Cette méthode permet aux praticiens de définir des corrections ophthalmiques exprimées en différences radiales, qui peuvent ensuite être incorporées dans la forme stratifiée d'un seul ensemble de lentilles ou superposées aux lentilles existantes, quelle que soit la courbure de la lentille.
PCT/US1985/002011 1981-03-09 1985-10-11 Systeme composite de lentilles ophthalmiques WO1987002477A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/528,606 US4547049A (en) 1981-03-09 1983-09-01 Composite ophthalmic lens system
PCT/US1985/002011 WO1987002477A1 (fr) 1985-10-11 1985-10-11 Systeme composite de lentilles ophthalmiques
EP19850905555 EP0240492A1 (fr) 1985-10-11 1985-10-11 Systeme composite de lentilles ophthalmiques

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PCT/US1985/002011 WO1987002477A1 (fr) 1985-10-11 1985-10-11 Systeme composite de lentilles ophthalmiques

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
FR2689654A1 (fr) * 1992-04-03 1993-10-08 Asahi Optical Co Ltd Lentille pour lunettes.
USRE36049E (en) * 1990-03-30 1999-01-19 Asahi Kogaku Kogyo Kabushiki Kaisha Cemented lens and process for production thereof

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US1948636A (en) * 1932-07-30 1934-02-27 American Optical Corp Lens
US2618200A (en) * 1948-04-01 1952-11-18 Clave Serge Composite bifocal lens
FR1299573A (fr) * 1961-05-30 1962-07-27 Perfectionnements aux lentilles multifocales
US3195145A (en) * 1964-06-10 1965-07-13 William Smith Dr Spectacle lens system having protective major lens and detachable posterior corrective lens
US3628854A (en) * 1969-12-08 1971-12-21 Optical Sciences Group Inc Flexible fresnel refracting membrane adhered to ophthalmic lens
US3702218A (en) * 1971-01-25 1972-11-07 Robert G Manhire Temporary cataract fittings
GB1321041A (en) * 1969-05-17 1973-06-20 Crowther J H Composite spectacle type lens production
US3877798A (en) * 1969-07-02 1975-04-15 Harry R Tolar Laminated multi-focal lenses
US3904281A (en) * 1969-12-08 1975-09-09 Optical Sciences Group Inc Flexible refracting membrane adhered to spectacle lens
US4070105A (en) * 1976-03-05 1978-01-24 Marzouk Youssef Marzouk Laminar fresnel reduced ophthalmic lens construction
JPH05210742A (ja) * 1991-07-29 1993-08-20 Gold Star Co Ltd ライングラフィックコードの処理方法及びその装置
JPH05277739A (ja) * 1992-03-31 1993-10-26 Nippon Sanso Kk 溶接用シールド治具
JPH05277738A (ja) * 1992-03-27 1993-10-26 Toshiba Eng Co Ltd 管の自動溶接装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948636A (en) * 1932-07-30 1934-02-27 American Optical Corp Lens
US2618200A (en) * 1948-04-01 1952-11-18 Clave Serge Composite bifocal lens
FR1299573A (fr) * 1961-05-30 1962-07-27 Perfectionnements aux lentilles multifocales
US3195145A (en) * 1964-06-10 1965-07-13 William Smith Dr Spectacle lens system having protective major lens and detachable posterior corrective lens
GB1321041A (en) * 1969-05-17 1973-06-20 Crowther J H Composite spectacle type lens production
US3877798A (en) * 1969-07-02 1975-04-15 Harry R Tolar Laminated multi-focal lenses
US3628854A (en) * 1969-12-08 1971-12-21 Optical Sciences Group Inc Flexible fresnel refracting membrane adhered to ophthalmic lens
US3904281A (en) * 1969-12-08 1975-09-09 Optical Sciences Group Inc Flexible refracting membrane adhered to spectacle lens
US3702218A (en) * 1971-01-25 1972-11-07 Robert G Manhire Temporary cataract fittings
US4070105A (en) * 1976-03-05 1978-01-24 Marzouk Youssef Marzouk Laminar fresnel reduced ophthalmic lens construction
JPH05210742A (ja) * 1991-07-29 1993-08-20 Gold Star Co Ltd ライングラフィックコードの処理方法及びその装置
JPH05277738A (ja) * 1992-03-27 1993-10-26 Toshiba Eng Co Ltd 管の自動溶接装置
JPH05277739A (ja) * 1992-03-31 1993-10-26 Nippon Sanso Kk 溶接用シールド治具

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE36049E (en) * 1990-03-30 1999-01-19 Asahi Kogaku Kogyo Kabushiki Kaisha Cemented lens and process for production thereof
FR2689654A1 (fr) * 1992-04-03 1993-10-08 Asahi Optical Co Ltd Lentille pour lunettes.

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