Multifocal intraocular lens with extended depth of field
AssigneeCarl Zeiss Meditec AG
InventorSergio Oscar Luque
Life of this patent
Estimating the term…
Abstract
Multifocal intraocular lens with extended depth of field that comprises, in at least one of the surfaces (2), a small zone with a multifocal profile with a defined optical axis (3) and, in the peripheral region and coaxial to the multifocal zone, a ring-shaped opaque mask (1) that partially or totally block light to produce a small aperture effect and, therefore, the multifocal profile has a radius equal or larger than the internal radius of the mask (1), and there is at least one transition between focal zones or one diffractive step inside the internal radius of the mask (1).
Claims16
Multifocal intraocular lens with extended depth of field, comprising:
- one or more surfaces of the multifocal intraocular lens, at least one of the one or more surfaces of the multifocal intraocular lens comprising:
- a small zone with a multifocal profile with a defined optical axis, and
- in the peripheral region and coaxial to the multifocal zone, a ring-shaped opaque mask that partially or totally blocks light to produce a small aperture effect and, therefore, the multifocal profile has a radius equal or larger than the internal radius of the mask, and there is at least one transition between focal zones or one diffractive step inside the internal radius of the mask, wherein the optical axis is misaligned with respect to the geometrical center of the lens,
- wherein a superior surface of the one or more surfaces of the lens is determined by:
- if
-
-
- r
- <
- RT
-
- z
- =
- R
-
-
- 1
- -
-
- R
-
-
- 1
- 2
- -
- r
- 2
- 2
-
- Eq
- .
-
- 1
- if
-
-
- RM
- >
- r
- >
- RT
- z
- =
- C
-
-
- 2
- -
-
- R
-
-
- 2
- 2
- -
- r
- 2
- 2
-
- Eq
- .
-
- 2
- if
-
-
- r
- >
- RM
-
- z
- =
- C
-
-
- 3
- -
-
- R
-
-
- X
- 2
- -
- r
- 2
- 2
-
- Eq
- .
-
- 3
- wherein r is a radial coordinate of the lens, z is an axial coordinate of the lens, RT is a transition radius between zones 1 and 2, RM is a multifocal radius, R1 is a radius of central curvature, R2 is a radius of peripheral curvature, RX is a curvature of radius of the profile of the surface in the zone of the mask, C3 is the center of RX, and C2=
- R
-
-
- 1
- -
- R
-
-
- 1
- 2
- -
- RT
- 2
- 2
- +
- R
-
-
- 2
- 2
- -
- RT
- 2
- )
- 2
- .
Dependencies are inferred from the claim text.