Optical visual aid with additional astigmatism

Patent metadata

Field	Value
Publication number	US-10168549-B2
Application number	US-201715594338-A
Country	US
Kind code	B2
Filing date	May 12, 2017
Priority date	Nov 14, 2014
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

An optical visual aid is disclosed that assists an observer looking at an object through at least one spectacle lens. The optical visual aid has a dioptric power matched to an eye of the observer for at least one viewing direction. The dioptric power is composed of a plurality of dioptric power components. A first dioptric power component of the plurality of dioptric power components has a best possible corrective power for the eye of the observer at a defined distance of the object from the corneal vertex of the eye for the viewing direction. At the same time, a further dioptric power component of the plurality of dioptric power components has an additional astigmatic, partly corrective power for the viewing direction for the eye of the observer at the defined distance.

First claim

What is claimed is:

1. An optical visual aid comprising:
at least one spectacle lens of an observer for looking at an object,
wherein the at least one spectacle lens of the optical visual aid has a dioptric power matched to an eye of the observer for at least one viewing direction (A, B), the dioptric power including a plurality of dioptric power components (K 1 , K 2 , K 3 , K 4 ),
wherein a first dioptric power component (K 1 , K 3 ) of the plurality of dioptric power components (K 1 , K 2 , K 3 , K 4 ) has a first corrective power for the at least one viewing direction (A, B) of the eye of the observer at a defined distance A S of the object from a corneal vertex of the eye,
wherein a further dioptric power component (K 2 , K 4 ) of the plurality of dioptric power components (K 1 , K 2 , K 3 , K 4 ) has an additional astigmatic power for the at least one viewing direction of the eye of the observer at the defined distance A S ,
wherein the first corrective power of the first dioptric power component contributes to an overall dioptric power of the visual aid by bringing a refraction for correcting a refractive error of the observer to a maximum visual acuity of the observer, up to ⅕ D of a prescribed spherical power and up to ⅕ DC of a prescribed astigmatic power, and an axis location of ±5° of the prescribed astigmatic power in a TABO scheme,
wherein the additional astigmatic power for the at least one viewing direction (A, B) at the defined distance A S of the object reduces the visual acuity of the observer by no more than 0.2 log MAR in relation to the visual acuity obtained by the first dioptric power component,
wherein the first dioptric power component (K 1 ) has a power which, for a distance A S ≥4 m of the object from the corneal vertex of the eye, corrects the eye of the observer for the at least one viewing direction (A),
wherein the further dioptric power component (K 2 ) has an additional negative astigmatic power for the eye of the observer for the at least one viewing direction (A), and
wherein the additional negative astigmatic power is a cylindrical refractive power BK with −1.0 DC≤BK≤−0.125 DC and with an axis location φ, specified in the TABO scheme, with 70°≤φ≤110°, or with an axis location φ, specified in the TABO scheme, with −20°≤φ≤20°.

2. The optical visual aid as claimed in claim 1 ,
wherein the dioptric power matched to the eye of the observer includes at least two first and two further dioptric power components,
wherein one of the two first dioptric power components (K 1 ) has the power which, for a distance A S ≤1 m of the object from the corneal vertex of the eye, corrects the eye of the observer for a first viewing direction (B) and the other one of the two first dioptric power components (K 3 ) has the power which, for a distance A S ≥4 m of the object from the corneal vertex of the eye, corrects the eye of the observer for a further viewing direction,
wherein one of the two second dioptric power components (K 2 ) has an additional negative astigmatic power for the eye of the observer with a cylindrical refractive power BK with −1.0 DC≤BK≤−0.125 DC and an axis location φ, specified in the TABO scheme, with 70°≤φ≤110° for the viewing direction (B) or an axis location φ with −20°≤φ≤20° for the viewing direction (B), and
wherein the other one of the two second dioptric power components (K 4 ) has an additional negative astigmatic power for the eye of the observer with a cylindrical refractive power BK with −1.0 DC≤BK≤−0.125 DC and an axis location φ, specified in the TABO scheme, with 70°≤φ≤110° or an axis location φ with −20°≤φ≤20° for the further viewing direction (A).

3. The optical visual aid as claimed in claim 2 , wherein the one of the two first dioptric power components (K 1 ) with the power which, for the distance A S ≤1 m, corrects the eye has a spherical refractive power SBK for the viewing direction (B) which has been reduced by a value ΔSBK, with −1.0 D≤ΔSBK≤−0.1 D, in relation to a power which, for a distance 25 cm≤A S ≤40 cm of the object from the corneal vertex of the eye, corrects the eye of the observer.

4. An optical visual aid comprising:
at least one spectacle lens of an observer for looking at an object,
wherein the at least one spectacle lens of the optical visual aid has a dioptric power matched to an eye of the observer for at least one viewing direction (A, B), the dioptric power including a plurality of dioptric power components (K 1 , K 2 , K 3 , K 4 ),
wherein a first dioptric power component (K 1 , K 3 ) of the plurality of dioptric power components (K 1 , K 2 , K 3 , K 4 ) has a first corrective power for the at least one viewing direction (A, B) of the eye of the observer at a defined distance A S of the object from a corneal vertex of the eye,
wherein a further dioptric power component (K 2 , K 4 ) of the plurality of dioptric power components (K 1 , K 2 , K 3 , K 4 ) has an additional astigmatic power for the at least one viewing direction of the eye of the observer at the defined distance A S ,
wherein the first corrective power of the first dioptric power component contributes to an overall dioptric power of the visual aid by bringing a refraction for correcting a refractive error of the observer to a maximum visual acuity of the observer, up to ⅕ D of a prescribed spherical power and up to ⅕ DC of a prescribed astigmatic power, and an axis location of ±5° of the prescribed astigmatic power in a TABO scheme,
wherein the additional astigmatic power for the at least one viewing direction (A, B) reduces the visual acuity of the observer by no more than 0.2 log MAR in relation to the visual acuity obtained by the first dioptric power component,
wherein the first dioptric power component (K 3 ) has the power which, for a distance A S ≤1 m of the object from the corneal vertex of the eye, corrects the eye of the observer for the at least one viewing direction,
wherein the further dioptric power component (K 4 ) has an additional negative astigmatic power for the eye of the observer for the at least one viewing direction (B), and
wherein the additional negative astigmatic power is a cylindrical refractive power BK with −1.0 DC≤BK≤−0.125 DC and with an axis location φ, specified in the TABO scheme, with 70°≤φ≤110°, or with an axis location φ, specified in the TABO scheme, with −20°≤φ≤20°.

5. The optical visual aid as claimed in claim 4 , wherein the first dioptric power component (K 3 ) has a spherical refractive power SBK for the viewing direction which has been reduced by the value ΔSBK, with −1.0 D≤ΔSBK≤−0.1 D, in relation to a power which, for a distance 25 cm≤A S ≤40 cm of an object from the corneal vertex of the eye, corrects the eye of the observer.

6. The optical visual aid as claimed in claim 4 ,
wherein the dioptric power matched to the eye of the observer includes at least two first and two further dioptric power components,
wherein one of the two first dioptric power components (K 1 ) has the power which, for a distance A S ≤1 m of the object from the corneal vertex of the eye, corrects the eye of the observer for a first viewing direction (B) and the other one of the two first dioptric power components (K 3 ) has the power which, for a distance A S ≥4 m of the object from the corneal vertex of the eye, corrects the eye of the observer for a further viewing direction,
wherein one of the two second dioptric power components (K 2 ) has an additional negative astigmatic power for the eye of the observer with a cylindrical refractive power BK with −1.0 DC≤BK≤−0.125 DC and an axis location φ, specified in the TABO scheme, with 70°≤φ≤110° for the viewing direction (B) or an axis location φ with −20°≤φ≤20° for the viewing direction (B), and
wherein the other one of the two second dioptric power components (K 4 ) ha

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Ohlendorf Arne
• Sessner Rainer
• Kratzer Timo
• Rifai Katharina
• Lappe Christian

Classifications

• G02C7/06

  bifocal; multifocal {; progressive (G02C7/041 takes precedence)} · CPC title

• A61B3/02

  Subjective types, i.e. testing apparatus requiring the active assistance of the patient · CPC title

• A61B3/032 Primary

  Devices for presenting test symbols or characters, e.g. test chart projectors (A61B3/036 takes precedence) · CPC title

• G02C7/024

  Methods of designing ophthalmic lenses · CPC title

• G02C7/02 Primary

  Lenses; Lens systems {; Methods of designing lenses} · CPC title