Ophthalmic apparatus with corrective meridians having extended tolerance band with freeform refractive surfaces
AssigneeJohnson & Johnson Surgical Vision, Inc.
InventorHuawei Zhao
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Abstract
The embodiments disclosed herein include improved toric lenses and other ophthalmic apparatuses (including, for example, contact lens, intraocular lenses (IOLs), and the like) that includes a freeform-polynomial surface area that establishes a band of operational meridian for the apparatus to an intended correction meridian. The freeform-polynomial surface area is defined by a mathematical expression comprising a combination of one or more polynomial expressions (e.g., Chebyshev-based polynomial expression, Zernike-based polynomial expression, etc.) each having a distinct complex orders.
Claims10
An ophthalmic apparatus having regions of one or more base spherical powers and one or more cylinder powers that are added to the one or more base spherical power for correcting an astigmatism, the apparatus comprising one or more optical zones, including a first optical zone defined by a freeform-polynomial surface area coincident with one or more distinct cylinder powers, wherein light incident to a first region of the freeform-polynomial surface area, and regions nearby to the first region, is directed to a first point of focus such that the regions nearby to the first region direct light to the first point of focus when the freeform-polynomial surface area is rotationally offset from the first region, thereby establishing a band of operational meridian for the apparatus to an intended correction meridian, and wherein the freeform-polynomial surface area is defined as a mathematical expression comprising a combination of one or more polynomial expressions each having a distinct complex orders,
- wherein the ophthalmic apparatus comprises a rotationally-tolerant intraocular lens (IOL),
- wherein the freeform-polynomial surface area has for each continuously distributed contour line at the IOL plane a difference of less than about 0.6 Diopters,
- wherein the combination of one or more polynomial expressions defines an angularly-varying phase member that is tolerant of cylindrical axis misalignment (CAM) up to an extended band of operation without degradation of visual acuity (VA) or modular transfer function (MTF).
Dependencies are inferred from the claim text.