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

Definitions

• the invention relates to an eyeglass lens with a supporting rim zone and a method for producing an eyeglass lens with a supporting rim zone.
• spectacle lenses with a carrying rim are used in particular in the prior art.
• Lenticular glasses are glasses in which only the central part of the
• Eyeglass lens has the corresponding optical effect, the outer area surrounding the central part serving only for fastening in the eyeglass frame.
• the supporting rim in the spectacle lens according to DE 33 43 Through the supporting rim in the spectacle lens according to DE 33 43
• This object is achieved by an eyeglass lens with the features mentioned in claim 1 and a method for producing an eyeglass lens with the features mentioned in claim 9.
• Preferred embodiments are the subject of the dependent claims.
• a spectacle lens is provided with an object-side front surface and an eye-side rear surface, at least the
• Back surface - includes a visual zone, which contributes to the optical effect of the spectacle lens, and a supporting rim zone which at least partially surrounds the visual zone, which essentially does not contribute to the optical effect of the spectacle lens, and the rear surface of the spectacle lens in the supporting rim zone, essentially from a cosmetic point of view, without taking into account optical
• the invention is based on the finding that there is an area in the edge region of the rear surface (i.e. the eye-side surface of the spectacle lens), in particular in the case of spectacle lenses with a negative effect, which is not essentially used for vision.
• the rear surface of the spectacle lens in this area can therefore be designed in particular in such a way that the cosmetic properties of the spectacle lens are improved without significantly influencing its optical properties or the imaging quality.
• This area represents the supporting edge zone of the spectacle lens, which together with the front surface forms a supporting edge.
• Cosmetic properties are understood in particular to mean the edge thickness, its variation, the center thickness, the weight and the volume of the spectacle lens.
• the visual zone is preferably separated from the supporting rim zone on the rear surface of the spectacle lens by a separating curve which points of penetration of those main rays (hereinafter referred to as outermost marginal rays) which are in the position of use of the spectacle lens in front of an eye of a spectacle wearer direct vision just through the eye pivot point 11 of the eye or particularly preferably with indirect vision just through the middle of the entrance pupil of the eye, connects to the back surface.
• the supporting edge zone then extends radially outward from the separating curve to the edge of the spectacle lens or preferably to a curve corresponding to the edge of the spectacle lens in the ground state (edge ku ⁇ / e).
• the separation curve is an imaginary curve on the back surface.
• the entrance pupil of the eye represents the aperture diaphragm of the spectacle lens-eye system and thus determines the course of the main rays.
• the field of vision in indirect vision is limited by those main rays which just barely penetrate both the front and the back surface of the spectacle lens and run through the center of the entrance pupil of an eye in the use position of the spectacle lens.
• these (critical) main rays are referred to as outermost edge rays.
• the design of the rear surface in particular has an area that extends from the penetration points of the outermost edge ray through the rear surface radially to the edge of the spectacle lens the optical properties of the lens have no significant influence. This area therefore preferably forms the supporting edge zone for indirect vision.
• the outermost marginal rays are preferably used as the outermost marginal rays in indirect vision in the use position of the spectacle lens. This results in a relatively large area that can be used to improve the cosmetic properties, i.e. a relatively large supporting rim zone.
• the section of the perceptible object area is shown controlled the head movements.
• the eye When looking directly at the lens in the position of use, the eye instead performs eye movements in order to map objects of interest to central areas of the fovea if possible.
• direct vision the eye rotates approximately around the optical pivot point ⁇ , which also acts as an apparent aperture diaphragm, the position of the exit pupil of the spectacle lens-eye system and thus determines the course of the main rays and thus also the outermost peripheral rays. After the refraction through the spectacle lens, the outermost marginal rays run through the eye pivot point Z '.
• the points of penetration of the outermost edge rays through the rear surface are somewhat distant from the edge of the lens, so that there is an area on the rear surface which extends from the points of intersection of the outermost edge rays through the rear surface to the edge of the lens and which is not for optical effect contributes to direct vision. This area represents the supporting edge zone for direct vision.
• the position of the separation curve can be calculated on the basis of an average or typical eye or according to the individual eye parameters of the respective spectacle wearer.
• the so-called Gullstrand model eye can be used.
• the distance from the top of the glasses to the entrance pupil of the model eye is then approximately HSA + 3.05 mm, where HSA represents the corneal-vertex distance.
• the eye pivot point of this average eye is approximately 13.5 mm behind the comea or, with a typical HSA of 15 mm, at a distance of 28.5 mm from the apex of the glasses. Since the entrance pupil is closer to the eye than the focal point of the eye, the optically unusable area, which represents the supporting edge zone, will be somewhat larger in indirect vision than in direct vision.
• the fovea is typically 5 degrees angular.
• the spectacle lens further preferably has a positive, negative, progressive, astigmatic and / or prismatic optical effect.
• the supporting edge zone is preferably designed in such a way that the frame shape and / or the frame shape are taken into account.
• the frame shape which is often also referred to as the so-called lens shape, is understood to mean a mathematically unambiguous parameterization of the shape of the rim of the spectacle lens.
• the frame shape specifies how the tubular lens has to be machined so that it fits into the frame. For example, round, oval or teardrop-shaped frame shapes are known.
• the frame shape is used to describe whether it is, for example, a rimless frame or a very thick plastic frame. Accordingly, the edge thickness of the lens can be chosen differently.
• the rear surface in the supporting edge zone can then be designed in such a way that the edge thickness of the spectacle lens or its variation in the ground state or along a curve which corresponds to the edge of the spectacle lens in the ground state (hereinafter also referred to as edge edge) runs optimally.
• edge edge the edge thickness of the spectacle lens or its variation in the ground state or along a curve which corresponds to the edge of the spectacle lens in the ground state (hereinafter also referred to as edge edge) runs optimally.
• the rear surface in the supporting rim zone can also be designed such that the rim thickness, its variation, etc. has the specified optimal values for tubular spectacle lenses.
• the rear surface in the supporting rim zone is further preferably designed such that the individual parameters of the spectacle wearer are taken into account.
• Individual parameters of the spectacle wearer are, for example, the corneal vertex distance, Forward inclination, pupil distance, side inclination, frame angle, eye pivot distance, eye length, object distance etc. It is thus possible to calculate the exact course of the outermost edge rays in the position of use or their penetration points through the rear surface and thus the area used to improve the cosmetic properties can. This enables an optimal design of the back surface in the supporting rim zone and thus improved cosmetic properties of the lens. However, the calculation can also be carried out with the help of standard values.
• the rear surface of the spectacle lens is designed such that the rear surface in the supporting edge zone adjoins the rear surface in the visual zone at least once, preferably twice, in a continuously differentiable manner.
• the rear surface in the supporting edge zone is preferably designed to reduce an edge thickness, edge thickness variation and / or center thickness of the spectacle lens.
• the rear surface in the supporting rim zone can also preferably be designed in such a way that the volume and mass of the spectacle lens are reduced.
• the uneven edge thickness development is the critical parameter.
• spectacle lenses for heterophoria or heterotropia i.e. spectacle lenses with a prismatic effect
• the non-uniform edge thickness, but also the central thickness are the critical parameters.
• presbyope lenses i.e. lenses with a progressive effect
• the most important factor is the uneven edge thickness development.
• combinations of the listed requirements can also occur with spectacle lenses with combined effects.
• the rear surface in the supporting rim zone is designed in such a way that the critical parameters for specified types of spectacle lenses are within the specified intervals or can be adhered to as well as possible.
• the rear surface in the supporting rim zone is preferably designed such that the maximum rim thickness of the spectacle lens can be reduced by preferably at least 5%, preferably 10%, and / or the rim thickness variation of the spectacle lens by preferably at least 10%, preferably 20%.
• the maximum center thickness of the spectacle lens can preferably be reduced by at least 3%, preferably 5%.
• the specified reduction relates to a spectacle lens without a rim as the starting size.
• a method for producing a spectacle lens with an object-side front surface and an eye-side rear surface is further provided, at least the rear surface having a visual zone which contributes to the optical effect of the spectacle lens, and a supporting edge zone which at least partially surrounds the visual zone and which is essentially not contributes to the optical effect of the lens, comprises, and wherein a calculation and / or optimization step of the rear surface of the spectacle lens in the supporting edge zone takes place essentially from a cosmetic point of view without taking into account the optical imaging properties of the supporting edge zone.
• the calculation and / or optimization step comprises the calculation of a separation curve on the back surface of the spectacle lens between the visual zone and the supporting edge zone in the form of a curve, which penetration points of the outermost edge rays, which in the position of use of the spectacle lens just in front of an eye of a spectacle wearer when viewed directly the eye pivot point Z 'of the eye or, particularly preferably in the case of indirect vision, just run through the center of the entrance pupil of the eye and connects to the back surface.
• the calculation and / or optimization step is further preferably carried out in such a way that the frame shape and / or frame shape are taken into account.
• an optimal course of the edge thickness of the spectacle lens or its variation in the ground condition can then be ensured.
• the calculation and / or optimization step is particularly preferably carried out in such a way that individual parameters of the spectacle wearer are taken into account. This makes it possible to calculate the outermost edge rays very precisely in the position of use and thus to optimally design the supporting edge zone.
• the calculation and / or optimization step is carried out in such a way that the rear surface in the supporting edge zone adjoins the visual zone at least once, preferably twice, continuously differentiable.
• the calculation and / or optimization step can be carried out in such a way that the parameters to be optimized from a cosmetic point of view are specified directly when the rear surface is optimized.
• a starting point for the back surface is assumed, which must be flexible enough to enable a corresponding optimization of the rear surface in the supporting edge zone according to the specified parameter.
• At least fourth-order potencies are required, in particular in the case of rotationally symmetrical aspheres. This procedure can be more advantageous in particular in the case of spectacle lenses with a positive refractive power, since the optical effect of the spectacle lens also changes with the variation of the critical parameter of the center thickness to be optimized from a cosmetic point of view.
• the rear surface in the supporting edge zone is optimized independently of the rear surface in the visual zone.
• the calculation and / or optimization step of the rear surface in the supporting edge zone takes place only after the calculation and / or optimization of the rear surface in the visual zone. It is thus possible to connect a supporting rim zone that is optimally designed from a cosmetic point of view to any predetermined rear surface, regardless of the design of the rear surface in the visual zone.
• the back surface in the visual zone can e.g. be a simple sphere or a progressive surface.
• Figure 1 is a highly schematic sectional view of the spectacle lens-eye system in indirect vision.
• 2 shows a highly schematic sectional illustration of the spectacle lens-eye system in direct vision;
• FIG. 3A shows a highly schematic sectional illustration of a preferred spectacle lens according to the invention and the course of the edge beam in the spectacle lens-eye system; and
• FIG. 3B is a highly schematic front view of the rear surface of the spectacle lens according to the invention shown in FIG. 3A.
• the optical axis of the spectacle lens-eye system coincides with the "z”axis;
• FIGS. 1 and 2 illustrate the calculation of the main rays during direct and indirect vision through the spectacle lens in the use position.
• the spectacle lens 1 shows a schematic illustration of the spectacle lens-eye system for indirect vision in the use position of the spectacle lens 1.
• the spectacle lens 1 (positive lens) has a convex front surface 20 on the object side and a concave rear surface 10 on the eye side.
• the eye 2 looks through the adjustment point of the spectacle lens 1.
• the point O denotes the adjustment point on the rear surface 10 of the spectacle lens 1 and the point Z 'the optical eye rotation point of the eyeball.
• the edge of the spectacle lens 1 is designated 30.
• P1 and P2 denote the penetration points of the main beam HS through the front surface 20 and rear surface 10 of the spectacle lens 1.
• the entrance pupil EP of the eye 2 which at the same time represents the aperture diaphragm of the spectacle lens-eye system, determines the course of the main beams HS.
• FIG. 2 shows a schematic illustration of the spectacle lens-eye system during direct viewing in the use position of the spectacle lens.
• the eye 2 is rotated around the optical eye pivot point Z '.
• a main beam HS runs through the eye pivot point Z '.
• P1 and P2 in turn denote the penetration points of the main beam HS through the front surface 20 and rear surface 10 of the spectacle lens 1.
• FIG. 3A shows an exemplary embodiment of a preferred negative spectacle lens 1 according to the invention on the basis of a schematic illustration.
• FIG. 3A shows in particular the course of an outermost edge ray RS in the spectacle lens-eye system when viewed directly, the eye 2 being rotated about the eye pivot point Z '(direct See).
• the spectacle lens 1 has a convex object-side Front surface 20 and a concave rear surface 10 on the eye.
• the outermost marginal ray RS is the main ray which penetrates through the spectacle lens 1 to the eye 2 and just runs through the eye pivot point Z 'of the eye 2. This edge ray RS penetrates the front surface 20 at point P1 and the rear surface 10 of the spectacle lens at point P2.
• the piercing point P2 of the edge ray RS through the rear surface 10 of the spectacle lens 1 is offset inwards relative to the edge 30 of the spectacle lens 1 (in the direction of the optical center of the spectacle lens), so that there is a region between the piercing point P2 and the edge 30 of the spectacle lens 1 results, which does not contribute to the optical effect and represents the supporting edge zone 11.
• the imaginary curve connecting the intersection points P2 of all outermost edge rays RS through the rear surface 10 is the separating line 15 between a visual zone 12 and a supporting edge zone 11.
• the intersection points P2 of the outermost edge rays RS are through the rear surface 10 is spaced from the edge 30 of the spectacle lens 1. This results in the supporting rim zone 11 between the rim 30 and the separating curve, which can be used to improve the cosmetic properties of the lens without significantly influencing the optical properties of the lens.
• the rear surface 10 in the supporting edge zone 11 can be designed in particular with a view to reducing the edge thickness, without significantly influencing the optical properties of the spectacle lens 1.
• Line 14 shows an exemplary profile of the rear surface 10 in the supporting rim zone 11 of the preferred spectacle lens 1 according to the invention.
• the dashed line 13 offset on the eye side opposite the line 14 shows the profile of the rear surface 10 in the supporting rim zone 11 of a conventional negative spectacle lens 1 without a reduction in rim thickness.
• a clear reduction in edge thickness can be achieved in the spectacle lens 1 according to the invention without influencing the optical imaging quality of the spectacle lens 1.
• the profile 14 of the rear surface 10 in the supporting edge zone 11 can also be designed such that a reduction in the edge thickness variation of the spectacle lens 1 can be achieved.
• the visual zone 12 of the spectacle lens 1 is calculated and designed according to the required order values or prescription values of the spectacle wearer.
• the rear surface 10 in the visual zone 12 can be designed in such a way that optimum imaging qualities of the spectacle lens can be guaranteed.
• the back surface 10 in the visual zone 12 can be, for example, a spherical, aspherical, toric, atoric and / or a progressive surface.
• 3B shows a highly schematic view of the rear surface 10 of the spectacle lens 1.
• the dividing curve 15 between the visual zone 12 and the supporting edge zone 11 is shown as a dashed line.
• the separation curve 15 connects the penetration points P2 of the outermost edge beam through the rear surface 10.
• FIG. 3A and 3B show a negative spectacle lens, the rear surface 10 in the supporting edge zone 11 being designed in such a way that the edge thickness of a negative spectacle lens 1 and / or its variation is minimized.
• negative glasses positive, astigmatic, prismatic and / or progressive glasses can also be used.
• the inventive design of the rear surface 10 achieves considerable cosmetic advantages without significantly influencing or even deteriorating the optical properties.
• the rear surface 10 in the supporting edge zone 11 can furthermore be designed in this way, instead of minimizing the edge thickness of the tubular spectacle lens, the edge thickness of the spectacle lens ground in a frame and / or the variation thereof.
• the particularly preferred spectacle lens described by way of example is the dividing curve between the supporting edge zone 11 and
• Vision zone 12 has been calculated for the case of direct vision. However, it is also possible to calculate the separation curve in the case of indirect vision.
• the outermost marginal ray is the main ray penetrating the front and rear surfaces, which just runs through the center of the entrance pupil of the eye in the position of use, the eye looking through the fitting point of the lens.
• the separation curve can thus be calculated either in the case of direct vision or, preferably, in the case of indirect vision.
• the order data are usually the dioptric effect with sphere, cylinder, axis, prism and base position and possibly the addition for multi-vision or progressive lenses.
• the order data determine the desired visual effect and thus the profile or the design of the back surface in the visual zone.
• Individual parameters of the glasses wearer are e.g. Corneal vertex distance, length of the eye, eye pivot point distance, pupil distance, pre-tilt, side tilt, frame lens angle, object distance, etc.
• Such consideration of the individual parameters of the spectacle wearer enables the precise determination of the penetration points of the outermost edge rays with the rear surface of the spectacle lens in the use position.
• the supporting edge zone can thus be optimally arranged and designed.
• this allows the rear surface in the supporting edge zone to be designed such that, for example, the edge thickness in the ground Condition (ie if the spectacle lens is adapted for a spectacle frame) runs optimally.
• the method can also be applied to tubular spectacle lenses.
• the course of the frame shape thus calculated on the spectacle lens and in particular on the rear surface of the spectacle lens then forms the edge curve.
• the edge of the tubular spectacle lens can form the edge curve.
• the points of intersection of the outermost marginal rays with the rear surface of the spectacle lens are preferably calculated in the case of indirect vision, since indirect vision is more required in the periphery.
• This step comprises the calculation of an (imaginary) curve which connects the penetration points of the marginal rays through the back surface determined in step 6 and which represents the separation curve between the visual zone and the supporting edge zone.
• This curve can e.g. be a spline curve.
• the edge thickness or the arrow heights along the edge curve directly when optimizing the initial rear surface.
• the area approach chosen for the initial rear surface must be flexible enough. For example, with a rotationally symmetrical asphere at least 4th order potencies are required. This method can be particularly advantageous in the case of spectacle lenses with a positive refractive power, since here the optical effect in the visual zone also changes with the variation in the center thickness.
• the profile of the rear surface in the supporting edge zone is only calculated after the area calculation or optimization of the rear surface in the visual zone.
• the rear surface of the spectacle lens is preferably designed such that the rear surface in the supporting edge zone adjoins the rear surface in the visual zone at least once, preferably twice, in a continuously differentiable manner.

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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)

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• 2004
  • 2004-03-03 DE DE102004010338.0A patent/DE102004010338B4/de not_active Expired - Lifetime
• 2005
  • 2005-02-21 WO PCT/EP2005/001784 patent/WO2005085937A1/de active Application Filing
  • 2005-02-21 JP JP2007501161A patent/JP2007526512A/ja active Pending
  • 2005-02-21 EP EP05728202A patent/EP1725906A1/de not_active Withdrawn
  • 2005-02-21 US US10/591,640 patent/US8118425B2/en active Active

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