Achromatic lenses with zone order mixing for vision treatment
Apparatuses, systems and methods for providing improved ophthalmic lenses, particularly intraocular lenses (IOLs), include features for reducing dysphotopsia effects, such as haloes and glare. Exemplary ophthalmic lenses can include an optic including a diffractive achromat configured to direct light to a common focus, with individual zones of the diffractive achromat directing light to the common focus in at least two different diffractive orders utilizing at least two different diffractive powers.
1. An intraocular lens comprising:
an optic including a diffractive achromat configured to direct light to a common focus, with individual zones of the diffractive achromat directing light to the common focus in at least two different diffractive orders utilizing at least two different diffractive powers,
wherein the individual zones of the diffractive achromat comprise a plurality of echelettes, and a first echelette of the plurality of echelettes has a first width in r-squared space, and a second echelette of the plurality of echelettes has a second width in r-squared space that is different than the first width in r-squared space.
2. The intraocular lens of claim 1 , wherein the individual zones of the diffractive achromat are configured to direct light to the common focus in at least three different diffractive orders.
3. The intraocular lens of claim 1 , wherein the first echelette has a first step height and the second echelette has a second step height that is different than the first step height.
4. The intraocular lens of claim 3 , wherein the first step height is proportionate to the first width in r-squared space, and the second step height is proportionate to the second width in r-squared space.
5. The intraocular lens of claim 1 , wherein the at least two different diffractive orders include a 1st diffractive order, and either a 2nd diffractive order or a 3rd diffractive order.
6. The intraocular lens of claim 1 , wherein the optic is an extended depth of focus optic or a multifocal optic.