WO2007041796A1 - Ophthalmic lens element for myopia correction - Google Patents
Ophthalmic lens element for myopia correction Download PDFInfo
- Publication number
- WO2007041796A1 WO2007041796A1 PCT/AU2006/001505 AU2006001505W WO2007041796A1 WO 2007041796 A1 WO2007041796 A1 WO 2007041796A1 AU 2006001505 W AU2006001505 W AU 2006001505W WO 2007041796 A1 WO2007041796 A1 WO 2007041796A1
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- WIPO (PCT)
- Prior art keywords
- lens element
- zone
- eye
- wearer
- central zone
- Prior art date
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Classifications
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- 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
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- 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
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
- G02C7/061—Spectacle lenses with progressively varying focal power
- G02C7/063—Shape of the progressive surface
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
-
- 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
- G02C2202/24—Myopia progression prevention
Definitions
- the present invention relates to ophthalmic lens elements for correcting myopia, and methods of designing such lens elements.
- an eye To provide focussed vision, an eye must be capable of focusing light on the retina.
- an eye's ability to focus light on the retina largely depends on the shape of the eyeball. If an eyeball is "too long" relative to its "on-axis" focal length (meaning, the focal length along the optical axis of the eye), or if the outside surface (that is, the cornea) of the eye is too curved, the eye will be unable to properly focus distant objects on the retina. Similarly, an eyeball that is "too short” relative to its on-axis focal length, or that has an outside surface which is too flat, will be unable to properly focus near objects on the retina.
- myopic eye An eye that focuses distant objects in front of the retina is referred to as a myopic eye.
- the resultant condition is referred to as myopia, and is usually correctable with appropriate single-vision lenses.
- conventional single-vision lenses correct myopia associated with central vision. Meaning that, conventional single-vision lenses correct myopia associated with vision that uses the fovea and parafovea.
- Central vision is often referred to as foveal vision.
- the present invention provides an ophthalmic lens element that simultaneously improves focussing in the foveal region and the peripheral region of the retina of a myope's eye. Accordingly, the present invention is directed to an ophthalmic lens element that compensates for a varying focal plane of the eye so as to remove most, if not all, blur from the retina, at least for a primary viewing position. Such compensation removes a stimulus for myopic progression and thus corrects, or at least reduces the progression of, myopia.
- the present invention provides an ophthalmic lens element for correcting myopia in a wearer's eye, the lens element including: (a) a central zone providing a first optical correction for substantially correcting myopia associated with the foveal region of the wearer's eye; and (b) a peripheral zone surrounding the central zone, the peripheral zone providing a second optical correction for substantially correcting myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye.
- An ophthalmic lens element includes a front surface (that is, the surface on the object side of the lens element) and a back surface (that is, the surface nearest the eye).
- the front and back surfaces are shaped and arranged to provide the respective optical corrections.
- the front and back surfaces are shaped and arranged to provide a refracting power for the central zone and the peripheral zone respectively.
- the refracting power provided by the central zone will be referred to as “the central zone power”
- the refracting power provided by the peripheral zone will be referred to as “the peripheral zone power”.
- the central zone refracting power substantially corrects myopia associated with foveal region
- the peripheral zone refracting power substantially corrects myopia (or hyperopia) associated with the peripheral region.
- the central zone may have a piano refracting power.
- Such an embodiment is expected to find application for wearer's who have not yet developed myopia, but still require an optical correction in the peripheral regional of the retina (for example, a hyperopic correction).
- the front surface and the back surface may have any suitable shape.
- the front surface is an aspherical surface and the rear surface is spherical or toric.
- the front surface is a spherical surface and the rear surface is aspherical or atoric.
- both the front surface and the rear surface are aspherical or atoric.
- the front or back surfaces may be formed by combining any suitable combination of surface shapes.
- a front (or back) aspherical or atorical surface may be formed by combining two ellipsoidal surfaces of different curvatures.
- the front surface is a segmented bi-focal surface and the rear surface is a spherical or toric surface.
- the front surface may include, in the central zone, a round centred spherical segment of lower surface power than the front surface power of the peripheral zone.
- the central zone power and the peripheral zone power correspond with different optical correction requirements of the wearer.
- the central zone power will typically correspond with the on-axial, or paraxial, optical correction required by the wearer, whereas, the peripheral zone power will typically correspond with an off-axis optical correction required by the wearer.
- the "off-axis optical correction" required by the wearer we mean an optical correction that corrects focussing in the peripheral region of the retina, for a viewing position at which the optical axis of the eye substantially aligns with the optical axis of the ophthalmic lens.
- the required optical corrections may be specified in terms of a first refracting power and a second refracting power.
- first refracting power refers to the optical correction (typically, the on-axis or paraxial optical correction) specified for the central zone
- second refracting power refers to the optical correction (typically, the off-axis optical correction) specified for the peripheral zone.
- the second refracting power is a refracting power at a radius of 20mm from optical centre of the ophthalmic lens element, as measured on the front surface of the lens element, and inscribes the peripheral zone over an azimuthal extent of at least 270 degrees.
- the required optical correction for the peripheral zone may be specified as a single value of refracting power or a set of values of refracting power.
- the optical correction of the peripheral zone is specified as a single value, that value may represent the optical correction required for a particular angle of peripheral vision.
- a single value of optical correction for the peripheral zone may be specified as a value of a refracting power for peripheral vision at a radius of 20mm from the optical centre of the central zone as measured on the front surface of the lens element.
- the single value may represent a mean optical correction required for a range of angles of peripheral vision.
- the single value of optical correction for the peripheral zone may be specified as a value of refracting power, for peripheral vision, extending over the radii between 10 mm and 30 mm from the optical centre of the central zone as measured on the front surface of the lens element.
- each value in the set may represent an optical correction required for a respective angle of peripheral vision.
- each set of values is associated with a range of angles of peripheral vision.
- the wearer's off-axis optical correction requirements are expressed in terms of clinical measurements that characterise the wearer's off-axis correction requirements. Any suitable technique may be used to obtain those requirements including, but not limited to, Rx data or ultrasound A-Scan data.
- the second refracting power provides a positive refracting power (that is, "a plus power correction") relative to the refracting power of the central zone.
- the second refracting power may be in the range of +0.50 D to +2.00 D relative to the refracting power of the central zone.
- positive refracting power is not accommodatable, and thus may induce blur on the fovea of the retina when the eye rotates to view objects in the periphery of the original field of view.
- the positive refracting power may induce blur on the fovea when the wearer looks at objects away from the optical axis of the lens (in other words, off-axis objects).
- the central zone is shaped and sized to provide the required optical correction over a range of eye-rotations so as to provide the wearer with the ability to view objects within an angular range, by rotating the eye over the range of eye-rotations, without inducing blur on the fovea.
- it is preferred that the central zone is shaped and sized to provide an area of substantially uniform refracting power to support clear foveal vision (hereinafter "central vision") throughout an angular range of eye rotations.
- the central zone "blends" into the peripheral zone via a blended zone so that the mean refracting power varies gradually in a radially outward direction from the boundary of the central zone and into the peripheral zone.
- the transition between the central zone and the peripheral zone provides a stepped change in refracting power as in, for example, a segmented bi-focal lens.
- the central zone may have any suitable shape and size.
- the central zone is an aperture having a shape and size that is matched to the extent of the wearer's typical eye rotations before they engage head rotation.
- the aperture may be rotationally symmetric or asymmetric depending on the frequency of eye rotations in different directions.
- An aperture having an asymmetric shape may be particularly suitable for a wearer having a different eye rotation pattern for different viewing directions.
- a wearer may have a tendency to rotate their eyes (rather than move their head) when adjusting their direction of gaze to view objects located in an upper and lower region of their visual field, but move their head (rather than rotate their eyes) when adjusting their direction of gaze to view objects located in different lateral regions of their visual field.
- the central zone may have a larger extent in the lower nasal direction to provide clear near vision.
- different lens elements may provide differently sized and shaped central zones.
- the present invention also provides a series of ophthalmic lens elements, the series including lens elements having a different peripheral aspherisations for the same base curve.
- a series of lens elements the series associated with a particular base curve that provides a peripheral power that provides a plus power correction, relative to the central zone, ranging from +0.50 to +2.00 D.
- Sets of series may also be provided so that a set provides plural series covering a range of base curves.
- the present invention also provides a method of dispensing or designing an ophthalmic lens element for correcting myopia in a wearer's eye, the method including: (a) obtaining, for the wearer:
- the ophthalmic lens element including: (i) a central zone providing an optical correction corresponding with the on-axis correction;
- a method according to the present invention may further include:
- the method embodiment of the present invention may be performed by a processing system including suitable computer hardware and software.
- the present invention also provides a system for dispensing or designing an ophthalmic lens element for correcting myopia in a wearer's eye, the system including:
- optical correction values including:
- a required value of off-axis optical correction for correcting myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye
- a system according to the present invention further includes:
- a processor for modifying the size and shape of the central zone according to the head movement and eye movement characteristics of the wearer so that central zone provides an area of substantially uniform refracting power for supporting central vision throughout an angular range of eye rotations.
- an ophthalmic lens of the present invention will remove, or at least reduce, a possible trigger of myopia progression.
- the present invention also provides a method of reducing myopia progression in a myope, the method including providing, to the myope, spectacles bearing a pair of ophthalmic lens elements, each lens element for a respective eye and including:
- peripheral zone surrounding the central zone, the peripheral zone providing an optical correction for correcting myopia or hyperopia associated with the peripheral region of a respective eye.
- the present invention also provides an ophthalmic lens element for correcting myopia, or retarding myopia progression, in a wearer's eye, the lens element including: a central zone providing clear foveal viewing throughout an angular range of eye rotations; and a peripheral zone surrounding the central zone, the peripheral zone providing, relative to the central zone, a plus power optical correction for substantially correcting myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye.
- the central zone may provide a piano, or substantially piano, refracting power.
- An embodiment that includes a central zone having a piano refracting power is expected to find application in retarding myopia progression in juveniles who do not require an optical correction for foveal vision.
- An ophthalmic lens element according to an embodiment of the present invention may be formulated from any suitable material.
- a polymeric material may be used.
- the polymeric material may be of any suitable type, for example, it may include a thermoplastic or thermoset material.
- a material of the diallyl glycol carbonate type, for example CR-39 (PPG Industries) may be used.
- the polymeric article may be formed from cross-linkable polymeric casting compositions, for example as described in U.S. Pat. No. 4,912,155, U.S. patent application Ser. No. 07/781 ,392, Australian Patent Applications 50581/93, 50582/93, 81216/87, 74160/91 and European Patent Specification 453159A2, the entire disclosures of which are incorporated herein by reference.
- the polymeric material may include a dye, preferably a photochromic dye, which may, for example, be added to the monomer formulation used to produce the polymeric material.
- An ophthalmic lens element according to an embodiment of the present invention may further include standard additional coatings to the front or back surface, including electrochromic coatings.
- the front lens surface may include an anti-reflective (AR) coating, for example of the type described in U.S. Pat. No. 5,704,692, the entire disclosure of which is incorporated herein by reference.
- AR anti-reflective
- the front lens surface may include an abrasion resistant coating, for example, of the type described in U.S. Pat. No. 4,954,591 , the entire disclosure of which is incorporated herein by reference.
- the front and back surfaces may further include one or more additions conventionally used in casting compositions such as inhibitors, dyes including thermochromic and photochromic dyes, for example, as described above, polarising agents, UV stabilisers and materials capable of modifying refractive index.
- ophthalmic lens element is a reference to all forms of individual refractive optical bodies employed in the ophthalmic arts including, but not limited to spectacle lenses, lens wafers for spectacle lenses and semi-finished lens blanks requiring further finishing to a particular wearer's prescription so as to form spectacle lenses.
- references to the term "surface astigmatism” are to be understood as a reference to a measure of the degree to which the curvature of the ophthalmic lens element varies among intersecting planes which are normal to the surface of the lens at a point on the surface.
- references to the term "foveal region” are to be understood as a reference to a region of the retina that includes the fovea and that is bounded by the parafovea.
- peripheral region is to be understood to as a reference to a region of the retina that is outside, and surrounds, the foveal region.
- An ophthalmic lens element according of the present invention simultaneously and substantially corrects both central and peripheral vision. Correction of this type is expected to remove, or at least delay, a presumed trigger of myopia progression in myopes, particularly in myopic juveniles.
- a preferred embodiment of a lens element according to the invention provides an ophthalmic lens element having a peripheral zone that provides a positive refracting power (that is, "a plus power correction") relative to the refracting power of the central zone.
- an embodiment of the present invention provides a central zone that is sized and shaped to provide an optical correction that provides the wearer with clear foveal vision over an aperture that corresponds with the wearer's typical eye rotations.
- the central zone provides a first optical correction for correcting myopia associated with the foveal region of the wearer's eye, and has a shape and size that has been matched, or selected on the basis of, a wearer's typical head movement and eye movement characteristics of the wearer.
- the preferred embodiment provides a correct foveal correction, not just in the centre of the lens element, but also in the area representing the extent of typical eye rotations before the head rotation gets engaged.
- the level of the plus power correction required by wearer will vary, given the large scatter in the myopic peripheral refractions found by Mutti et al. (2000).
- a number of peripheral asphehsations are provided with the range of plus power corrections ranging from +0.50 to +2.00 D.
- four different peripheral aspherisations are provided for each base curve: 0.5, 1.0, 1.50 and 2.0 D to be dispensed to people showing peripheral refractions up to the threshold value of the correction.
- Fig.1 -A is a front view of an ophthalmic lens element according to a first embodiment of the present invention
- Fig.1 -B is a sectional view of the ophthalmic lens element illustrated in Fig.1 -A.;
- Fig.2-A is a graph showing the front surface mean power of the lens element shown in Fig.1 -A;
- Fig.2-B is a graph showing the front surface astigmatism of the lens element shown in Fig.1 -A;
- Fig.2-C is a graph showing the tangential and sagittal surface power of the lens element shown in Fig.1 -A;
- Fig.3-A is a front view of an ophthalmic lens element according to a second embodiment of the present invention.
- Fig.3-B is a sectional view of an ophthalmic lens element illustrated in Fig.3-A.;
- Fig.4-A is a graph showing the front surface mean power of the lens element shown in Fig.3-A;
- Fig.4-B is a graph showing the front surface astigmatism of the lens element shown in Fig.3-A;
- Fig.4-C is a graph showing the tangential and sagittal surface power of the lens element shown in Fig.3-A;
- Fig.5-A is a front view of an ophthalmic lens element according to a third embodiment of the present invention.
- Fig.5-B is a sectional view of an ophthalmic lens element illustrated in Fig.5-A.;
- Fig.6-A is a graph showing the front surface mean power of the lens element shown in Fig.5-A;
- Fig.6-B is a graph showing the front surface astigmatism of the lens element shown in Fig.5-A;
- Fig.6-C is a graph showing the tangential and sagittal surface power of the lens element shown in Fig.5-A;
- Fig.7-A is a front view of an ophthalmic lens element according to a fourth embodiment of the present invention
- Fig.7-B is a sectional view of an ophthalmic lens element illustrated in Fig.5-A.;
- Fig.8-A is a graph showing the front surface mean power of the lens element shown in Fig.7-A;
- Fig.8-B is a graph showing the front surface astigmatism of the lens element shown in Fig.7-A;
- Fig.8-C is a graph showing the tangential and sagittal surface power of the lens element shown in Fig.7-A;
- Fig.8-D is a series of contour plots for the ophthalmic lens element depicted in Fig. 7A;
- Fig.9-A is a front view of an ophthalmic lens element according to a fifth embodiment of the present invention.
- Fig.9-B is a sectional view of an ophthalmic lens element illustrated in Fig.9-A;
- Fig.10-A is a graph showing the front surface mean power of the lens element shown in Fig.9-A;
- Fig.10-B is a graph showing the front surface astigmatism of the lens element shown in Fig.9-A;
- Fig.10-C is a graph showing the tangential and sagittal surface power of the lens element shown in Fig.9-A;
- Fig.11 is a series of contour plots for an embodiment of an ophthalmic lens element having an asymmetrical cental zone
- Fig.12 is a simplified flow diagram of a method embodiment of the present invention.
- Fig.13 is a simplified block diagram of a system embodiment of the present invention.
- Fig.1 -A illustrates an ophthalmic lens element 100 in accordance with an embodiment of the present invention having a central power of -3.00 D and a diameter of 60 mm.
- Fig.1-B depicts a side view of the lens element 100 along section A-A', but is shown truncated to a diameter of 50 mm for fitting to a spectacle frame.
- the depicted ophthalmic lens element 100 is an aspheric single vision lens 100 including a central zone 102 and a peripheral zone 104. As is shown in Fig.1 -B, the lens 100 also includes a front surface 108 and a back surface 110.
- the central zone 102 is a zone that is bounded by a 0.5 D contour or surface astigmatism. In the present case, the central zone 102 extends radially outwardly to an outer boundary located at a radius (R PI ) of about 11 mm.
- the front surface 108 provides a central crown curvature of 3.00 D (in a lens material having a 1.53 index of refraction) that extends out to a radius (Rc) of about 5 mm. That radius corresponds to an eye rotation of around 10 ° .
- the front surface 108 also provides, in the peripheral zone 104, a marginal mean curvature of around 3.5 D at around a radius (Rp ⁇ ) of 30 mm.
- references to the term "marginal mean curvature” are to be understood as a reference to the curvature of the part of the peripheral zone that lies outside of the blended zone.
- the ophthalmic lens element 100 also includes a "blended zone" 106 (shown as shaded region), which is shown located in the peripheral zone 104 and which provides a gradual transition in refracting power from the refracting power at the outer boundary of the central zone 102 to an intermediate radius (R B ) in the peripheral zone 104.
- the blended zone is bounded by an inner 0.5 D contour of surface astigmatism at a radius (R PI ) of about 11 mm from the optical centre of the lens element 100, and an outer 0.5 D contour of surface astigmatism at a radius (R B ) of about 17mm from the optical centre of the les element 100.
- the blended zone has a radial extent of R B - R PI - As depicted in Fig.1 -A, the radial extent of the blended zone is less than the radius (R PI ) of the central zone 102.
- the front surface 108 of the ophthalmic les element 100 has a shape that has been constructed by combining two ellipsoid surfaces of different curvature with a weighting function M(r) and is defined by the surface height function:
- R R axes — , — and R 0 in the x, y and z directions respectively.
- a similar a o argument can apply for large values of r.
- M(r) can be any suitable weighting function.
- the shape of the lens surfaces is controlled by the following parameters:
- R 0 The radius of curvature at the centre of the lens (hereinafter the "crown radius").
- Ri The radius of curvature towards the temporal edge of the lens (hereinafter the "marginal radius").
- a, b scaling factors for the x and y axes in g o and gi.
- choosing a value for 6 ⁇ 1 will result in a non-rotationally symmetric surface which is flatter in the y direction (ellipsoidal shaped surface).
- m, n, p. parameters defining the function M(r) and where and how rapidly the transition between the central zone and peripheral zone occurs. Also the value of these parameters can be varied to locate an umbilic ring or band in the peripheral zone, or to control the size of the umbilic spherical region at the centre of the surface shape.
- t. parameter to allow a gradual increase in the curvature of the peripheral zone as r increases.
- Fig.2-A to Fig.2-C shows various characteristics of the front surface 108 of the lens 100 (ref. Fig.1 ) having the parameters listed in table 1.
- the back surface of the lens is a sphere with surface power of -8.3 D in 1.53 index.
- the ophthalmic lens element 100 provides a central zone 102 (ref. Fig.1 ) having a refracting power of -5.0 D and a peripheral zone 104 (ref. Fig.1 ) having a refracting power of around -4.5 D.
- the peripheral zone provides a plus power relative to the central zone.
- Fig.3-A illustrates another example of an ophthalmic lens element 200 according to an embodiment of the present invention.
- the lens element 200 includes a front surface 108 having the same crown curvature as the lens 100 of Example 1 , but a higher mean marginal curvature corresponding to an optical correction of +1.00 D in the peripheral zone relative to the central zone power.
- the back surface of this lens element 200 and the refracting power of the central zone 102 are the same as per Example 1.
- the front surface 108 uses the same mathematical description as Example 1 , with a few parameters changed as listed in table 2.
- Fig.4-A to Fig.4-C show various characteristics of the front surface 108 of the lens 200.
- Fig.5-A illustrates an example of an ophthalmic lens element 300 in the 1.6 refractive index material including a front surface 108 having a marginal radius of curvature of 136.5 mm, and the same crown curvature as in Examples 1 and 2 corresponding to an optical correction of around +1.00 D in the peripheral zone 104 relative to the central zone 102 power. That is, in this example, the lens element 300 has a mean crown curvature of 3.40 D, and a mean marginal curvature of 4.39D at a radius of 20 mm from the lens centre.
- the front surface 108 uses the same mathematical description as Example 1 and Example 2 with a few parameters changed.
- the revised parameter values are as listed in table 3.
- Fig.6-A to Fig.6-C show various characteristics of the front surface 108 of the ophthalmic lens element 300.
- the ophthalmic lens element 300 has a larger blended region 106, as compared with ophthalmic lens element 100 (ref. Fig.1A) and ophthalmic lens element 200 (ref. Fig.3A).
- a larger blended region 106 helps to keep the peak value of astigmatism on the front surface 108 to around 0.75 D as compared to over 2.00 D in Example 2. It is envisaged that a lower peak value of astigmatism will make the ophthalmic lens element 300 easier for the wearer to adapt to.
- Example 4 Fig.7-A illustrates another example of an ophthalmic lens element 400 according to an embodiment of the present invention.
- the ophthalmic lens element 400 is manufactured from a 1.6 refractive index material and includes a front surface 108 having the same crown radius as the lens element 300 of Example 3, and a similar marginal curvature in the peripheral zone, corresponding to an optical correction of around +1.00 D in the peripheral zone 104 power relative to the central zone 102 power.
- the lens element 400 has a mean crown curvature of 3.40 D, and a mean marginal curvature of 4.28 D at a radius of 20 mm.
- the front surface 108 uses a finite element mesh surface mathematical description and has been designed by blending a central spherical surface having a surface power of 3.40 D with a peripheral spherical surface having a surface power of 4.28 D at a radius of 20 mm from the lens centre.
- the blending occurs between the radii of 11 mm and 50 mm.
- a C2 continuous extrapolation algorithm that minimises the surface curvature deviation from that of the marginal curvature, has been used to calculate a surface profile of the blend. It will be appreciated that it is not essential that a C2 extrapolation algorithm be used as any other suitable extrapolation algorithm may also be suitable.
- Fig.8-A to Fig.8-C show various characteristics of the front surface 108 of the lens element 300.
- the ophthalmic lens element 400 has a larger and nearly perfect spherical central region as compared to the previous examples.
- the larger and nearly perfect spherical central region helps to provide a clearer foveal vision to the wearer up to moderate values of eye rotation.
- Fig.8-D illustrates contour plots 402, 404, 406 for the surface tangential 402, and sagittal powers 404 as well as the surface astigmatism 406 (cylinder) of the front surface of the ophthalmic lens element 400.
- Example 5 Fig.9-A illustrates an example of a segmented bifocal ophthalmic lens 500 element in 1.6 refractive index material including a front surface 108 having a crown curvature of 3.96 D, and a peripheral marginal curvature of 5.46 D at a radius of 20mm from the lens centre, corresponding to an optical correction of +1.50 D in the peripheral zone 104 relative to the central zone 102.
- the front surface 108 is made up of two rotationally symmetric spherical segments, namely a first centred round segment defining the central zone 102 and a second centred segment defining the peripheral zone 104.
- the first centred round segment has a radius (R PI ) of 14 mm which provides clear foveal vision up to the eye rotations of around 30°. It is to be appreciated that a different radius may be used without departing from the scope of the invention.
- Fig.10-A to Fig.10-C show various characteristics of the front surface 108 of the ophthalmic lens element 500.
- the second centred segment has zero surface astigmatism and in addition to providing an appropriate correction for peripheral vision, could also be used foveally for close work, such as reading.
- Fig.11 illustrates contour plot diagrams 602 (tangential), 604 (sagittal), 606 (cylinder) of an example of an ophthalmic lens element including a central zone 102 having an asymmetric shape.
- the contour plots 602, 604, 606, illustrate the surface tangential and sagittal powers as well as surface astigmatism (cylinder) of the front surface of an ophthalmic lens element in 1.6 refractive index material.
- the surface characterised by the contour plots 602, 604, 606 have be derived as a new optimisation for the original surface characterised by the contour plots 402, 404, 406 (ref. Fig.8-D) of the front surface of the ophthalmic lens element 400 with the symmetrical central zone 102 of Example 4.
- the central zone 102 is asymmetrical and provides a low level of astigmatism in an area 608 elongated towards the lower nasal side of the ophthalmic lens element to reduce the need for turning the head down during near work.
- the mean surface power in the peripheral zone at different radii from the optical centre of the lens element (as measured on the front surface of the lens), may not be constant throughout a particular radius.
- the peripheral power at 20mm from the optical centre of the lens element will be at least +0.50 D relative to the surface power at the optical centre of the central zone and inscribes, over each radii, the peripheral zone over an azimuthal extent of at least 270 degrees.
- Fig.12 is a simplified flow diagram for a method embodiment of the present invention. As shown, an embodiment of the method includes the step 1202 of obtaining a wearer's on-axis optical correction value. As explained previously, an on-axis optical correction value is a value required for clear central vision. The on-axis optical correction may be obtained using conventional measurement techniques and devices that known in the art, such as
- an off-axis optical correction value is an optical correction required to correct peripheral refractive errors in the wearer's eye, and thus for correcting myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye.
- the off-axis optical correction may be obtained using conventional measurement techniques and devices known in the art, such as a Shin-Nippon autorefractor configured to measure peripheral refraction in a wearer's eye for a measurement axis aligned with a direction different to that of the wearer's primary direction of gaze.
- a Shin-Nippon autorefractor configured to measure peripheral refraction in a wearer's eye for a measurement axis aligned with a direction different to that of the wearer's primary direction of gaze.
- One suitable technique is described in David A. Atchison et al, 'Peripheral Refraction along the Horizontal and Vertical Visual Fields in Myopia' (2006) 46 Vision Research 1450, the entire disclosures of which is incorporated herein by reference solely for the purpose of providing a skilled reader with an example a suitable device.
- an ophthalmic lens element is selected or designed in accordance with the measured values so as to include a central zone providing an optical correction corresponding with the on-axis correction; and a peripheral zone surrounding the central zone, the peripheral zone providing an optical correction corresponding with the off-axis correction.
- those zones may also have a shape and size that depends on the wearer's typical pattern of eye rotation.
- the selection or designing of the ophthalmic lens element may be performed by a system including a programmed computer equipped with suitable computer software.
- a system 1300 is depicted in Fig.13.
- the system 1300 includes one or more input devices 1302-A, 1302A for accepting or obtaining optical correction values for a wearer.
- the optical correction values include a required value of on-axis optical correction for correcting myopia associated with the foveal region of the wearer's eye, and a required value of off-axis optical correction for correcting myopia or hyperopia associated with a peripheral region of the retina of the wearer's eye.
- the input devices 1302-A, 1302-B will typically include conventional devices for measuring the wearer's required on-axis optical correction and the wearer's a device required off-axis optical correction.
- One suitable input device for measuring a wearer's required off-axis optical correction is a Hartmann- Shack instrument configured to measure peripheral wave front aberrations in a wearer's eye for a measurement axis aligned with the direction of the wearer's preferred retinal location.
- Another suitable device is an open-field autorefractor, such as, for example, an autorefractor sold under the brand Shin-Nippon SRW- 5000 or Shin Nippon NVision K5001.
- the system 1300 also includes a processor 1304 for accepting and processing the wearer's optical correction values to select or design an ophthalmic lens element according to the required values of on-axis and off-axis correction.
- the processor 1304 is a programmed computer equipped with suitable computer software. Examples of suitable computers include a desktop computer, a hand-held computer, a lap top computer, or a personal digital assistant.
- the input devices 1302-A, 1302-B may further include a device for accepting or obtaining head movement and eye movement characteristics for the wearer, such as, for example, an eye-tracking system of the type described in U.S.
- the processor 1304 will also include additional functionality to modify the size and shape of the central zone according to the head movement and eye movement characteristics of the wearer so that central zone provides an area of substantially uniform refracting power for supporting central vision throughout an angular range of eye rotations.
- ⁇ Chromatic aberration for example, since the periphery of the fovea has relatively fewer cones and more rods it may be more important to keep a particular wavelength in focus, thus the design of the lens element may take into account parameters that provide selective focussing of that wavelength. It may also be necessary to have low chromatic aberration materials.
- a wave-front abberometer may be used to sample optical errors from a foveal through to a peripheral location to more fully characterise the off-axis errors of the eye.
- the desired blur spot minimisation is applied to deliver appropriate corrections to the entire field of view of the eye.
- Those samples may be translated, using appropriate relationships, so as to characterise the shape and or off-axis correction/s of the eye.
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
- Prostheses (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008534821A JP2009511962A (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens elements for myopia correction |
CN2006800441239A CN101317120B (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
AU2006301940A AU2006301940B2 (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
KR1020087011146A KR101302317B1 (en) | 2005-10-12 | 2006-10-12 | Ophthalmic Lens Element for Myopia Correction |
US12/083,227 US7862171B2 (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
ES06790375.7T ES2599510T3 (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
CA2626050A CA2626050C (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
EP06790375.7A EP1934648B1 (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
BRPI0617356-0A BRPI0617356B1 (en) | 2005-10-12 | 2006-10-12 | “Ophthalmic Lens Element, Method and System for Dispensing or Designing an Ophthalmic Lens Element to Correct Myopia in an Eye of the User” |
HK09102226.3A HK1125184A1 (en) | 2005-10-12 | 2009-03-09 | Ophthalmic lens element for myopia correction |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2005905621A AU2005905621A0 (en) | 2005-10-12 | Opthalmic lens element | |
AU2005905621 | 2005-10-12 | ||
AU2005906150 | 2005-11-07 | ||
AU2005906150A AU2005906150A0 (en) | 2005-11-07 | Ophthalmic lens element |
Publications (1)
Publication Number | Publication Date |
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WO2007041796A1 true WO2007041796A1 (en) | 2007-04-19 |
Family
ID=37942230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/AU2006/001505 WO2007041796A1 (en) | 2005-10-12 | 2006-10-12 | Ophthalmic lens element for myopia correction |
Country Status (12)
Country | Link |
---|---|
US (1) | US7862171B2 (en) |
EP (1) | EP1934648B1 (en) |
JP (3) | JP2009511962A (en) |
KR (1) | KR101302317B1 (en) |
CN (1) | CN101317120B (en) |
AU (1) | AU2006301940B2 (en) |
BR (1) | BRPI0617356B1 (en) |
CA (1) | CA2626050C (en) |
ES (1) | ES2599510T3 (en) |
HK (1) | HK1125184A1 (en) |
MY (1) | MY147505A (en) |
WO (1) | WO2007041796A1 (en) |
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Also Published As
Publication number | Publication date |
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CN101317120B (en) | 2012-12-26 |
EP1934648B1 (en) | 2016-08-03 |
AU2006301940A1 (en) | 2007-04-19 |
US7862171B2 (en) | 2011-01-04 |
JP2009511962A (en) | 2009-03-19 |
BRPI0617356B1 (en) | 2018-02-14 |
HK1125184A1 (en) | 2009-07-31 |
AU2006301940B2 (en) | 2012-03-29 |
JP2015132827A (en) | 2015-07-23 |
US20090257026A1 (en) | 2009-10-15 |
CA2626050A1 (en) | 2007-04-19 |
CA2626050C (en) | 2015-12-08 |
KR20080069991A (en) | 2008-07-29 |
EP1934648A1 (en) | 2008-06-25 |
BRPI0617356A2 (en) | 2011-07-26 |
JP6236020B2 (en) | 2017-11-22 |
JP2013015873A (en) | 2013-01-24 |
MY147505A (en) | 2012-12-14 |
KR101302317B1 (en) | 2013-08-30 |
ES2599510T3 (en) | 2017-02-02 |
EP1934648A4 (en) | 2010-09-22 |
JP6062708B2 (en) | 2017-01-18 |
CN101317120A (en) | 2008-12-03 |
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