MXPA96001670A - Multifo multifo concentric ring lens - Google Patents

Abstract

Combined multifocal toroidal lens designs are described that combine a correction for astigmatism, either of the cornea or lenticular, with a correction for presbyopia. One of the anterior and posterior lens surfaces defines a toroidal surface for an astigmatic optical correction, and one of the surfaces or the opposing surface defines a multifocal surface for a presyopic optical correction, to provide visual acuity for astigmatic presbiops. Disclosed are embodiments wherein one lens design surface has a combined concentric annular ring, multifocal toroidal surface and another designed lens surface has a spherical or spherical surface. In other embodiments, one surface of the lens design has a toroidal surface for a toroidal correction, and the other surface of the lens design has a multifocal surface to provide a presyopic correction, which may include designed multifocal concentric annular ring lenses, or other Presbyopic lens designs containing more than one spherical or spherical power such as spheres, segments, progressive, diffractive, birefringent and other concentric spheres

Description

MULTIFQCAL CONCENTRIC ANULAR RING LENS BACKGROUND OF THE INVENTION 1. - FIELD OF THE INVENTION The present invention relates generally to combined multi-functional toroidal lens designs, and very particularly it relates to combined toroidal lens designs combined combining a correction for asymmetry, either of the cornea or lenticular, with a correction for presbyopia In greater detail, the present invention provides a ultifocal concentric annular ring lens for astigmatic presbiops wherein one of the anterior and posterior lens surfaces defines a toroidal surface for astigmatic optical correction, and one of the anterior and posterior surfaces defines a multifocal surface for a presbyopic optical correction, to provide visual acuity for igneous presbiops. 2. - DISCUSSION OF THE PREVIOUS TECHNIQUE Conventional multifocal soft contact lenses and intraocular lenses provide distant and near spherical optical power. However, many patients can not achieve sufficient visual acuity due to astigmatism of the cornea or lenticular. The present invention relates to ophthalmic lenses having combined ultifocal toroidal lens designs, and in particular to contact lenses, such as soft hydrogel contact lenses, and intraocular lenses, having more than one optical power or focal length, which They are designed particularly for igneous presbiopes. It is well known that as an individual ages, the eye is less able to produce accommodation, that is, to bend the natural lens in the eye, to focus on objects that are relatively close to the observer. This condition is known as presbyopia, and presbyopia in the past have used glasses or other lenses that have a number of different regions with different optical powers to which the user can change their vision in order to find the appropriate optical power for the object or objects on which the observer wishes to focus the view. Similarly, for a person whose lens has been removed from the eye due to a cataract condition and an intraocular lens has been inserted to replace it, the ability to adjust the lens (accommodate) to the distance of the object that being visualized is totally absent. In this case, the provided lens is generally fixed to a single focal power of infinite distance, and the glasses wear out to provide the additional positive optical power needed to focus the closer vision. For such a patient, a functional ultifacal lens would be an extremely useful part. It is also known in the art that under certain circumstances the brain can discriminate enti and separate competent images by accepting a focused image and rejecting an out-of-focus image. Toroidal contact lenses have a cylindrical optical surface / power that is used to correct astigmatism in a patient. Substantially, astigmatism occurs in people primarily on either the horizontal axis or the vertical axis of the eye, but could occur at any position. In the prior art, a separate type of toroidal contact lens is required for each toroidal optical power and also for each different orientation of the toroidal cylindrical axis of the contact lens, which is required to accommodate different patients with different amounts of astigmatism throughout. of e is different. Accordingly, inventories of toroidal contact lenses, or plastic molding parts for molding toroidal contact lenses, include a number of different combinations of toroidal axis location and toroidal optical power. Sene Patent Application No. 07 / 9β £, 0ß & (case of proxy VTIM 56), titled PUP1L TUNED MULTIFOCAL OPHTHALMIC LENS (MULTIFOCAL MULTIFOCAL LENS ADJUSTED TO THE PUPIL), describes a multifocal concentric ophthalmic lens for presbyopic patients constructed with three portions of general annular lenses in a multifocal design. A circular central portion of the lens has only the corrective power of the patient's distance and is surrounded by a first internal annular portion., which may consist of multiple annular rings having an internal radial portion that increases the close focal power of the patient encircled by radial potions of varying cumulative amounts of distance and focal correction of near optical power for the patient. This is surrounded by a second outer annular portion, which may also consist of one or more annular rings having additional distance focal power near the periphery of the ophthalmic lens optical surface area. Each annular ring has either near or far optical power and works in combination with other lens portions to allow the desired focal ratio in that lens portion.

BRIEF DESCRIPTION OF THE INVENTION Accordingly, a principal object of the present invention is to provide combined multifocal toroidal lens designs that combine a correction for astigmatism, either of the cornea or lenticular, with a correction for presbyopia.

Various embodiments are described in accordance with the teachings of the present invention in which: One surface of the lens design contains a toroidal correction, while the other surface of the lens design provides a presyopic correction, which may include concentric ultifocal lens designs as described in the US Patent Application Series Nos. 07 / && amp; , 0 & amp; Y 07 / 986,071 (case of proxy VTN 56 and VTN 57), or other designs of presbyopic lenses containing more than one spherical or spherical power (such as spherical, segments, progressive, diffractive, unrefined or other concentric b), and generally includes, an anterior taroidal surface in combination with a multifocal post surface ior, or an anterior multifocal surface in combination with a posterior toroidal surface, or in other embodiments, a lens design surface contains a combined concentric multifocal toroidal surface, and the other lens design surface contains a spherical or aesphric correction and generally includes a posterior multifocal toroidal surface in combination with a anterior spherical surface, which is a preferred embodiment or a posterior multifocal toroidal surface in combination with a frontal enhancer or spherical surface, which is a second preferred embodiment, or a a posterior spherical surface in combination with a anterior multifocal toroidal surface, or an enlarging surface or back aesphen in combination with a anterior toroidal multxfocal surface. All of the above embodiments may require position stabilization involving ballast or table features either in the anterior or posterior portion of the lens, as is known in the art, and accordingly those known features are not illustrated in the accompanying drawings. . In accordance with the teachings given herein, the present invention provides a multi-focal concentric annular ring lens for astigmatic presbiops wherein one of the anterior and posterior lens surfaces defines a toroidal surface for an astigmatic optical correction, and one of the anterior and posterior surfaces defines a multifocal surface for presyopic optical correction, to provide visual acuity for astigmatic presbiops. In some embodiments, a single surface can incorporate both corrections and has a multifocal toroidal surface combined with a plurality of annular toroidal rings. In more detail, the toroidal surface can define a central area comprising a toroidal disk having a toroidal surface corresponding to a distant optical power. A plurality of annular toroidal rings surround the central area and comprise at least one annular toroidal ring having close optical power and at least one annular toroidal ring having a distant optical power. The plurality of annular toroidal rings preferably comprises toroidal rings of near optical power and toroidal rings of distant optical power, with the innermost annular toroidal ring having close optical power and the innermost annular toroidal ring having a distant optical power. Moreover, the widths of the individual annular toroidal rings can vary to generate a power profile with different optical power radii distant at near optical power. The toroidal surface may comprise either an anterior or posterior surface of the lens, and the ultifocal surface may also comprise either an anterior or posterior surface of the lens, and the ultifocal surface may also comprise either the same posterior or anterior surface or the surface opposite of the lens. In vain modalities, the multifacal surface defines a central area comprising a spherical disk having a spherical surface corresponding to a distant optical power. A plurality of annular circular rings surrounding the central area and comprising at least one annular circular ring having close optical power and at least one circular annular ring having a distant optical power. The plurality of annular rings preferably comprises rings of alternative near optical power and a rings of distant optical power, with the innermost annular ring having close optical power and the next inner ring ring having an optical power at a distance-Moreover, the widths of the individual annular rings may be different to generate a power profile that varies to generate different optical power relations distant to near optical power. In these circular annular ring modalities, the toroidal surface is the opposite surface (anterior vs. posterior) to the multifocal surface. The lens may comprise a contact lens that is to be abraded in the cornea of the eye, such as a soft hydrogel contact lens, or may be an intraocular lens.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects and advantages of the present invention of combined multifocal toroidal lens designs can be more readily understood by one skilled in the art with reference to the following detailed description of several preferred embodiments thereof, taken in conjunction with the accompanying drawings wherein the elements are designated with identical reference numbers in all the various views, and in which: Figures 1 and 2 are rear and side plan views of a modality of a multifocal toroidal contact lens design combined in accordance with the teachings of the present invention having a thoracic multifocal posterior concentric annular ring surface in combination with an anterior spherical surface, which is a preferred embodiment, or with an anterior enlarging or spherical surface, which is a second preferred embodiment. Figures 3 and < + are respectively a second embodiment of a combined multifocal toroidal contact lens in accordance with the present invention having a posterior spherical surface or a posterior spherical surface in combination with a toroidal multifocal surface of concentric annular ring go; Figures 5 and 6 are front and rear plan views respectively of a third embodiment of a combined multifocal toroidal contact lens according to the present invention having an anterior toroidal surface in combination with a. multifocal surface of posterior concentric annular ring; Figures 7 and 6 are front and rear plan view respectively of a fourth embodiment of a combined multifocal toroidal contact lens in accordance with the present invention having a multifocal anterior concentric annular ring surface in combination with a posterior toroidal surface.

DETAILED DESCRIPTION OF THE DRAWINGS In a first general embodiment, one surface of the lens design contains a toroidal correction, while the other surface of the lens design provides a presyopic correction, which may include ultifocal lens designs as described in the patent application of E.U.A. Series Nos. 07 / 966,066 and 07 / 966,071 (cases of proxy VTN 56 and VTN 57), or other presbyopic lens designs containing more than one spherical or spherical power (such as spheres, segments, productive spheres, diffractives, birefringens or other concentric), and generally include, an anterior toroidal surface in combination with a posterior multifocal surface, or an anterior multifocal surface in combination with a posterior toroidal surface. In a second general embodiment, one surface of the lens design contains a combined concentric multifocal toroidal surface, and the other surface of the lens design contains a spherical or spherical correction, and generally includes a posterior multifocal toroidal surface in combination with a anterior spherical surface, which is a preferred embodiment, or a posterior toroidal multifocal surface in combination with an anterior increasing spherical surface, which is a second preferred embodiment, or a posterior spherical surface in combination with a anterior multifocal toroidal surface, or a posterior spherical surface in combination with a anterior multifocal toroidal surface. Figures 1 and 2 are rear plan views and side views respectively of a first embodiment of a combined ultifocal toroidal contact lens 10 in accordance with the teachings of the present invention having a toroidal multifocal surface of concentric annular ring 12 in combination with an anterior spherical surface 14-, which is a preferred embodiment, or with a spherical surface of frontal increase 14-, which is a second preferred embodiment. The spherical surface can be any selected spherical surface adapted to perform a visual correction for the user. The posterior toroidal surface 12 defines a central area comprising a toroidal disk 16 having a toroidal surface corresponding to a distant optical power (marked D). A plurality of annular toroidal rings 18, 20, 22, 24 surround central area 16 and comprise annular toroidal rings 18 and 22 having close optical power (marked with N) and annular toroidal rings 20 and 24 having a distant optical power ( marked with D). The plurality of annular toroidal rings preferably comprises toroidal rings of near alternating optical power and toroidal rings of distant toroidal power, with the annular toroidal ring 16 having an optical power close to it, and the innermost annular ring toroidal having a Furthermore, the widths of the individual annular toroidal rings can vary, as illustrated in Figure 1, to generate a power profile with different optical power ratio distant to near optical power. Illustratively designed embodiment, the central toroidal disc 16 and the annular rings 20 and 24 have a radius of 8.4 mm distant, while the annular rings 16 and 22 have a close radius of 8,694 mm The intermediate radius of curvature is 6.380 mm, and the peripheral curve radius is 9.82 mm, to provide an optical cylinder power of -1.25 D. The toroic disk The central 16 has a horizontal width of 2.0 mm and a vertical height of 1.7828 mm, the ring annulus toroidal 18 has a horizontal width of 3.3 mm and a vertical height of 2.9279 mm, the ring annular toroidal 20 has a horizontal width of 4.25 mm and a vertical height of 3.7966 mm, the toroidal annular ring 22 has a horizontal width of 5.2 mm and a vertical height of 4.6265 mm, the annular toroidal ring 24- has a horizontal width of 8.0 mm and a vertical height of 7.1745 m.

The combined areas of the center 16 toroidal disk and ircundantes annular rings 18 and 24 comprise the active optical area of the lens, which is surrounded by a (non-optical) lenticular area 26 which is beveled at its outer circumference at 28 to an outer circumferential edge of the lens. In the illustrative designed embodiment of Figures 1 and 2, the annular lenticular area 26 has a diameter of 13.0 mm at the beginning of the beveled area 28, and the outer circumference of the lens has a diameter of 14.0 mm. Figures 3 and 4 are front and side plan views respectively of a second embodiment of a combined multifocal toroidal contact lens 30 in accordance with the present invention having a posterior spherical surface 32 or a posterior spherical surface 32 in combination with a toroidal multifocal surface of anterior concentric annular ring 34. The anterior toroidal surface 34 defines a central area comprising a toroidal disc 36 having a toroidal surface corresponding to a distant optical power. A plurality of annular toroidal rings 38, 40, 42, 44 surround the central area and comprise annular spherical rings having close optical power and ring toroidal rings 40 and 44 having a distant optical power. In addition to an inversion of sides, the toroidal surface 34 is substantially similar to the toroidal surface 14 in the embodiment of FIGS. 1 and 2, and the comments, dimensions, optical powers, etc. given with respect to the embodiment of Figures 1 and 2 apply to the embodiment of Figures 3 and 4. Figures 5 and 6 are respectively front and rear plan views of a third embodiment of a combined multifocal toroidal contact lens. in accordance with the present invention having a front toroidal surface 52 in combination with a ultifocal surface concentric annular ring back surface 54. the above toroidal taroidal 52 comprises a large surface 56 which has a horizontal axis in figure 5, having an area substantially covering the same area as the concentric annular rings on the opposite side 54 of the lens. The cylindrical optical power and the orientation of the cylindrical e e are in accordance with the astigmatic prescription of the lens. The toroidal surface 56 is surrounded by a lenticular (non-optical) area 58, which is beveled at 59 to an outer peripheral edge of the lens. The multifocal rear surface 54 defines a central area comprising a spherical disk 60 having a spherical surface corresponding to a distant optical power. A plurality of circular annular rings 62, 64, 66, 68, 70 and 72 surround the central area 60 and comprise annular circular rings 62, 66 and 70 having a near optical power and annular circular rings 64, 68 and 72 having a distant optical power. The plurality of annular rings preferably comprises nearby optical power rings and alternating distant optical power toroidal rings, with the innermost annular ring t > 2. having a near optical power. Moreover, the widths of the individual annular rings may be different, as illustrated in FIG. 6, to generate a power profile that varies to generate different ratios of optical power distant to near optical power. The optical region of the lens, which is comprised by the external diameter of the annular ring 72, is surrounded by a lenticular (non-optical) area 74 to the peripheral edge of the lens. Figures 7 and 8 are respectively views in front and back of a fourth embodiment of a lens toroidal contact combined ultifocal 80 in accordance with the present invention having a ultifocal surface of annular ring previous concentric 82 in combination with a rear toroidal surface 64-. The embodiment of Figures / and 8 is substantially similar to the embodiment of Figures 5 and 6, with the ultifocal surface now being the anterior surface of the lens, and the toroidal surface now being the posterior surface of the lens. However, the orientation of the cylindrical axis in Figure 8 is now vertical rather than horizontal as in Figure 6. Accordingly, the explanation and comments made with respect to the embodiment of Figures 5 and 6 apply equally with respect to the embodiment of Figures 7 and 8. The lens can be a contact lens to be worn over the cornea of the eye, such as a soft hydrogel contact lens, or it can be an intraocular lens. The central area and the plurality of annular rings are preferably formed on the back surface of a contact lens to minimize spreading and bright problems. The size of a person's pupil is a function that depends on the intensity of light, and is an important parameter in the design of ophthalmic lenses, particularly contact lenses and intraocular lenses. Furthermore, in vivo eye image quality measurement devices can be used to optimize ocular image quality in concentric annular ring lens designs to produce even better designs. This is accomplished by using an in vivo image quality measurement device to measure and decrease the sum of the aberrations of a first lens design over the patient's oo to measure residual aberrations, and then redesign the lens to reduce residual aberrations measures and improve visual acuity and performance. The redesigning of the lenses may include damage to the surface opposite the surface defining the central area and the plurality of annular rings, by the end of the concentric annular ring surface. Moreover, an aberroscope or spot dissemination device M1F is preferably used to measure the modulation transfer function of the lens and eye combination. Obviously, any different embodiments of the present invention are possible, with alterations of the number of annular rings, the widths and arrangement of the annular rings, and the optical powers assigned to each of the annular rings. Although various embodiments and variations of the present invention are described in detail herein for combined ultifocal toroidal lens designs, it will be apparent that the description and teachings of the present invention will suggest many alternative designs to those aspects in the art.

Claims (18)

NOVELTY OF THE INVENTION CLAIMS

1. A multifocal concentric annular ring lens for astigmatic presbiops, comprising: a) said lens having a front surface and the opposite posterior surface, wherein one of the anterior and posterior surfaces defines a toroidal surface for an astigmatic optical correction; and b) one of the anterior and posterior surfaces defines a multifocal surface for a presbyopic optical correction, to provide visual acuity for astigmatic presbiops.

2. A multifocal concentric annular ring lens for astigmatic presbiops according to claim 1, further characterized in that the toroidal surface defines a central area comprising a toroidal disc having a toroidal surface corresponding to a distant optical power, and a plurality of annular toroidal rings surrounds the central area and comprises at least one annular toroidal ring having a near optical power and at least one annular toroidal ring having a distant optical power.

3. A concentric annular ring lens for astigmatic presbyopia according to claim 1, characterized in that the ultifocal surface comprises multiple spherical surfaces.

4. A multifocal concentric annular ring lens for astigmatic presbiops according to claim 1, further characterized in that the multifocal surface comprises an entangle or spherical surface.

5. A multifocal concentric annular ring lens for astigmatic presbiops according to claim 2, further characterized in that the plurality of annular toroidal rings comprise toroidal rings of near optical power and toroidal rings of alternating distant optical power.

6. A multifocal concentric annular ring lens for astigmatic presbiops according to claim 2, further characterized in that the innermost annular toroidal ring has a near optical power and the next inner ring annular ring has a distant optical power.

7. A multifocal concentric annular ring lens for astigmatic presbiops according to claim 2, further characterized in that the annular toroidal ring widths are different to generate a power profile that varies to generate different ratios of optical power distant to power optical c ercana.

8. A concentrically annular ring lens for astigmatic preebiops in accordance with the indication J, further characterized in that the toroidal surface comprises a front surface of the lens and the ultifocal surface also comprises the anterior surface of the lentp.

9. A concentric annular ring lens for astigmatic presbyopia according to claim 1, further characterized in that the toroidal surface comprises a posterior surface of the lens and the multifocal surface also comprises the posterior surface of the lens.

10. A concentric annular ring lens for astigmatic presbyopia according to claim 1, further characterized in that the multifocal surface defines a central area comprising a spherical disc having a distant optical power and a plurality of annular rings surrounding the central area and comprise at least one annular ring having a near optical power and at least one annular ring having a distant optical power.

11. A multifocal concentric annular ring lens for astigmatic presbiops according to claim 10, further characterized in that the plurality of annular rings comprises rings of near optical power and alternating distant optical power rings. 12.- A ultifocal concentric annular ring lens for astigmatic presbiops according to claim 10, further characterized in that the innermost annular ring has a near optical power and the next innermost annular ring has a distant optical power. 13. A concentric annular ring lens in accordance with claim 10, further characterized in that the widths of the individual annular rings are different to generate a power profile that varies to generate different optical power ratios distant to near optical power. 14. A concentric annular ring lens according to claim 10, further characterized in that the toroidal surface comprises a front surface of the lens and the multifocal surface comprises a rear surface of the lens. 15. A concentric annular ring lens according to claim 10, further characterized in that the toroidal surface comprises a rear surface of the lens and the multifocal surface comprises a front surface of the lens. 16. A multifocal concentric annular ring lens according to claim 1, further characterized in that the lens comprises a contact lens that is to be worn on the cornea of the eye. 17. A multifocal concentric annular ring lens according to claim 13, further characterized in that the contact lens comprises a soft hydrogel contact lens. 18. A multifocal concentric annular ring lens according to claim 1, further characterized in that the lens comprises an intraocular lens. MULTIFQCAL CONCENTRIC ANULAR RING LENS SUMMARY OF THE INVENTION Combined ultifocal toroidal lens designs that combine a correction for astigmatism, either of the cornea or lenticular, with a correction for presbyopia are described. One of the anterior and posterior surfaces of the lens defines a toroidal surface for an astigmatic optical correction, and one of the anterior and posterior surfaces, which may be the same surface or the opposite surface, defines a multifocal surface for a presbyopic optical correction, for provide visual acuity for astigmatic presbyopia. Disclosed are embodiments wherein one lens design surface has a combined concentric annular ring, multifocal toroidal surface and another designed lens surface has a spherical or spherical surface. In other embodiments, one surface of the lens design has a toroidal surface for a toroidal correction, and the other surface of the lens design has a multifocal surface to provide a presyopic correction, which may include designed concentric annular ring lenses, or other designs of presbyopic lenses containing more than one spherical or spherical power such as spheres, segments, progressive, diffractive, birefringent and other concentric aespheres. JJ / cgt * crm *