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 a single-vision spectacle lens according to the preamble of claims 1 and 2, respectively.
• An eyeglass lens, from which the preamble of claim 1 is based, is known from Example 7 of EP 0 560 999 AI.
• This spectacle lens has a rotationally symmetrical aspherical surface and an ator surface.
• EP 0 560 999 A1 is essentially concerned with reducing the lens thickness and the imaging errors in spectacle lenses with an astigmatic effect. However, as can be seen from FIGS. 21a and 21b of EP 0 560 999 A1, both “astigmatic error” and “refractive index deviation” remain in both main sections “residual errors” of at least 0.18 dpt.
• the invention is therefore based on the object
• astigmatic errors and refractive errors should advantageously be corrected with respect to all directions of view if possible.
• the surfaces or surfaces of the lens should reduce the mentioned errors can be optimized. The additional effort should still be kept low.
• the basis of the invention is that if the imaging errors cannot be corrected for all viewing angles, this can be done for one or more preferred directions, in contrast to the prior art.
• Such a preferred direction is generally the horizontal and / or the vertical direction. However, it can also be any other direction, depending on the application (eg golf player).
• the aberrations for the other gaze directions (up to 40 degrees gaze deflection) must not exceed values that severely impair direct vision. For example, these are values of 1.0 dpt.
• the second surface can then be chosen as desired, but is preferably a rotationally symmetrical aspherical surface.
• the atoric surface can be a surface with two, one or no plane of symmetry. If the preferred direction for the correction and the axis position of the astigmatism do not match - this is comparatively often the case - then the atoric surface preferably no longer has a plane of symmetry.
• a purely spherical prescription also requires at least one atoric surface. Either one then uses an atoric surface in which the apex curvatures are the same - that is, surface astigmatism only occurs outside the center or the apex - which is to be preferred, or the - actually undesirable - astigmatism at the apex has to be replaced by a compensate for the second toric or atoric surface.
• the number of lines according to claim 1 is greater than 1.
• the spectacle lens surfaces can be additionally adapted depending on the optical requirements.
• the design and the position of the line or lines can also advantageously be carried out in accordance with the optical requirements.
• FIG. 1 a shows the astigmatic error of an exemplary embodiment “spectacle lens No. 1”
• Fig. Lb the refractive error of the embodiment according to the invention "spectacle lens No. 1"
• At least one of the two surfaces of the spectacle lens is an ator surface.
• atoric surfaces e.g. with the mathematical approaches given below, although other approaches, such as approaches with spline functions, are of course also possible. The following approaches are therefore given for general explanation only.
• a rotationally symmetrical asphere can be described as follows:
• the first exemplary embodiment "spectacle lens No. 1" is defined as follows:
• the spherical prescription is: sph -4.0 dpt, the cylinder cyl +1.0 dpt, and the axis position A 0 degrees
• the back surface is an atorus with a plane of symmetry. The following values apply:
• the second exemplary embodiment according to the invention “spectacle lens No. 2” is defined as follows:
• a 0 degrees Front surface rotationally symmetrical asphere with
• A4 -0.177484884515455D-001
• A5 -0.360085396588794D-001
• Figure la shows the astigmatic error, i.e. the deviation of the astigmatism from the prescribed astigmatism, taking into account the axial position of the "spectacle lens No. 1".
• the line represents the 0.25 d isoline line. It can be seen that the spectacle lens corresponds almost everywhere to the prescribed values, in particular along the horizontal and vertical direction Larger deviations only occur in the periphery outside the preferred directions.
• Fig. 1b shows the refractive error, i.e. the deviation of the average refractive index from the prescribed average refractive index of "glasses No. 1". It can be seen that the deviations fluctuate everywhere around the value 0.
• 2a shows the astigmatic error, ie the deviation of the astigmatism from the prescribed astigmatism taking into account the axis position for the “glasses No. 2”. No deviations occur in the horizontal and vertical directions.
• 2b shows the refraction error, ie the deviation of the average refractive index from the prescribed average refractive index for the “glasses No. 2”. It can be seen that the deviations fluctuate everywhere around the value 0.

Landscapes

• Health & Medical Sciences (AREA)
• Ophthalmology & Optometry (AREA)
• Physics & Mathematics (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Eyeglasses (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Lenses (AREA)
• Glass Compositions (AREA)
• Testing Of Optical Devices Or Fibers (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7932975

Family Applications (1)

Country Status (7)

Cited By (3)

Families Citing this family (7)

Family Cites Families (4)

• 1999
  • 1999-12-16 DE DE19960826A patent/DE19960826A1/de not_active Ceased
• 2000
  • 2000-12-18 EP EP00991092A patent/EP1240541B1/de not_active Expired - Lifetime
  • 2000-12-18 ES ES00991092T patent/ES2302498T3/es not_active Expired - Lifetime
  • 2000-12-18 AT AT00991092T patent/ATE387645T1/de not_active IP Right Cessation
  • 2000-12-18 DE DE50015002T patent/DE50015002D1/de not_active Expired - Lifetime
  • 2000-12-18 WO PCT/DE2000/004509 patent/WO2001044859A2/de not_active Ceased
  • 2000-12-18 JP JP2001545891A patent/JP4841784B2/ja not_active Expired - Fee Related
  • 2000-12-18 US US10/168,156 patent/US6752497B2/en not_active Expired - Lifetime

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