Multifocal ophthalmic lens with induced aperture

US 6,474,814 B1
Filed: 09/08/2000
Issued: 11/05/2002
Est. Priority Date: 09/08/2000
Status: Expired due to Term

First Claim

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1. An ophthalmic lens comprising:

an optical surface of revolution about an apex having an apical distance power, the apex also having an apical radius of curvature, the surface defined by;

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Abstract

Multifocal lenses are defined by nonconical aspheric optical surfaces. Various alternative surface shapes provide a central distance vision region surrounded by an optical step. The optical step has rapidly increasing power in the radial direction which creates an induced aperture through which the cortical elements of the vision system are induced to concentrate. The induced aperture results in increased clarity in distance vision. Nonconical aspheric optical surfaces are defined to produce the desired optical power distributions. These surface functions are also provided in form of polynomial series for simplicity of use in computer driven lathes for shaping contact lenses. The invention includes contact lenses, scleral lenses, intraocular lenses, and lenses impressed or surgically shaped within the corneal tissue as well as methods of designing and fitting these lenses.

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23 Claims

1. An ophthalmic lens comprising:
- an optical surface of revolution about an apex having an apical distance power, the apex also having an apical radius of curvature, the surface defined by;
- View Dependent Claims (2, 3, 4, 5, 6, 7)
- - 2. The lens according to claim 1, wherein:
    - P has a value in the range of 1 to 60.
  - 3. A lens according to claim 2, further comprising:
    - a reduced power region surrounding the optical step and having optical power decreasing rapidly from the maximum power radially outward to a reduced power no greater than the distance power.
  - 4. The lens according to claim 3, further comprising:
    - a scotopic vision region surrounding the reduced power region.
  - 5. The lens according to claim 4, wherein:
    - the distance power is negative and the scotopic region has a power more negative than the distance power.
  - 6. The lens according to claim 4, wherein:
    - the scotopic region has a power equal the distance power.
  - 7. The lens according to claim 1, wherein:
    - the lens is a intraocular lens.

8. An ophthalmic lens comprising:
- a centrally located distance vision region having an apex;
  
  an optical step surrounding the distance vision region; and
  
  at least one optical surface creating a lens power distribution that increases smoothly radially outward from an apical power at the apex to a maximum distribution power greater than the apical power, and the power distribution increasing sufficiently rapidly in the optical step to the maximum distribution power to induce a user receiving distant images passing through the lens to view the distant images through the distance vision region.
- View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- - 9. A lens according to claim 8, wherein:
10. A lens according to claim 9, further comprising:
- a near vision region extending radially outward from the optical step and having power equal the near vision power.
11. A lens according to claim 10, further comprising:
- a scotopic vision region surrounding the near vision region and having a scotopic power no greater than the apical power.
12. A lens according to claim 11, wherein:
- the scotopic power is less than the apical power.
13. A lens according to claim 8, wherein:
- the at least one optical surface is an optical surface defined by the summation;
  
  $Z (x) = \sum_{n = 1}^{m} \frac{{k^{2 n - 1} (\ln P)}^{2 (n - 1)}}{(2 \cdot n)!} \cdot x^{2 n}$ $where;$ $\begin{matrix} x & is a perpendicular distance from the apex in millimeters, \\ Z (x) & defines a sagittal depth at point x, \\ k & is the inverse of the apical radius of curvature \\ in millimeters, \\ P & is a power base, \\ \ln & is the natural logarithm function . \\ m & equals at least 3. \end{matrix}$
14. A lens according to claim 13, wherein:
- P has a value in the range of 1 to 60.
15. A lens according to claim 8, wherein:
- the at least one optical surface is an optical surface defined by $Z (x) = \frac{k x^{2}}{2} \cdot [1 - {(1 - S \cdot k^{2} \cdot x^{2})}^{1 / 2}] \cdot {[1 + {(1 - S \cdot k^{2} \cdot x^{2})}^{1 / 2}]}^{- 1} + {(2 \cdot k \cdot {(\ln P)}^{2})}^{- 1} \cdot P^{k \cdot x} + {(2 \cdot k \cdot {(\ln P)}^{2})}^{- 1} \cdot P^{k \cdot x} - {(k \cdot {(\ln P)}^{2})}^{- 1}$ $wherein; \begin{matrix} x & is a perpendicular distance from the apex in millimeters \\ Z (x) & defines a sagittal depth at point x, \\ k & is the inverse of the apical radius of curvature in millimeters, \\ P & is a power base, \\ \ln & is the natural logarithm function, and \\ S & is a shape factor . \end{matrix}$
16. A lens according to claim 15, wherein:
- P has a value in the range of 1 to 60.
17. A lens according to claim 16, wherein:
- S has a value in the range of −
  
  5 to 2.
18. A lens according to claim 8, wherein:
- the power distribution from the apical power to the maximum power is defined by a cyclic function.
19. A lens according to claim 18, whereinthe cyclic function is:
- $ADD (x) = \frac{ADDM}{2} \cdot [1 + cosine [π \cdot (\frac{X c - x}{X c})]]$ $where;$ $\begin{matrix} ADD (x) & is the add power above the apical power at x, \\ x & is a perpendicular distance from the apex, \\ ADDM & is equal the maximum power, \\ X c & is a predetermined location of the maximum power, \\ and \\ π & is the trigonometric value pi equal the ratio of a \\ circle'"'"' s circumference to diameter . \end{matrix}$

20. A method of correcting human sight comprising:
- forming at least one optical surface in eye tissue, the surface creating a lens power distribution having an apex and a distance vision region surrounding the apex, and the power distribution changing smoothly and without optical discontinuity outward from an apical power at the apex to a maximum distribution power greater than the apical power, and the power distribution having an optical step in which the power increases sufficiently rapidly to induce a user receiving distant images passing through the lens to perceive the distant images through the distance vision region.

21. An ophthalmic lens comprising:
- a lens surface creating a lens power distribution having an apex and a distance vision region surrounding the apex, and the power distribution changing smoothly, and without optical discontinuity, outward from an apical power at the apex to a maximum distribution power greater than the apical power, and the power distribution having an optical step for inducing a user receiving distant images passing through the lens to perceive the distant images through the distance vision region.
- View Dependent Claims (22, 23)
- - 22. An ophthalmic lens according to claim 21, wherein:
23. A lens according to claim 22 wherein:
- P has a value in the range of 1 to 60.

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Current Assignee
Visioneering Technologies, Inc.
Original Assignee
Florida Optical Engineering, Inc.
Inventors
Griffin, Richard A.
Primary Examiner(s)
SCHWARTZ, JORDAN MARC

Application Number

US09/657,562
Time in Patent Office

788 Days
Field of Search

351/159, 351/160.R, 351/160.H, 351/161, 351/168, 351/169, 623/6-3-, 623/6-7-
US Class Current

351/161
CPC Class Codes

A61F 2/1613   having special lens configu...

A61F 2/1618   Multifocal lenses

A61F 2/164   Aspheric lenses

A61F 2250/0036   differing in thickness

G02C 7/028   Special mathematical design...

G02C 7/041   bifocal; multifocal

G02C 7/042   Simultaneous type

G02C 7/044   Annular configuration, e.g....

G02C 7/061   Spectacle lenses with progr...

G02C 7/063   Shape of the progressive su...

Multifocal ophthalmic lens with induced aperture

First Claim

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Multifocal ophthalmic lens with induced aperture

First Claim

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Abstract

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