Contact lenses and related procedures
The contact lens design addresses halation issues by using an inclined annular region with enhanced power to focus light at different focal planes, improving visual clarity and accommodation for both distant and near objects.
Patent Information
- Application Number
- DE112022006190
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2021-12-21
- Filing Date
- 2022-12-15
- Publication Date
- 2025-07-31
- Estimated Expiration
- 2042-12-15
AI Technical Summary
Conventional contact lenses for myopia and presbyopia correction, such as dual focus lenses, can cause undesirable visual side effects like halation due to annular addition power regions focusing light in front of the retina, and they do not effectively utilize the eye's natural accommodation for focusing nearby objects.
A contact lens design featuring a central region with a base power and an annular region with greater radial bending and sagittal power, inclined relative to the central region, which focuses light at different focal planes to prevent halation and enhance depth of field.
The lens design reduces halation effects and enhances depth of field, allowing the eye to naturally accommodate for both distant and near vision without relying on additional focusing mechanisms.
Smart Images
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Abstract
Claims
[1] Contact lens (201, 301), the lens including an optical zone (202, 302) comprising: a central region (205, 305), the central region having a first optical axis (219), a base radial curvature power, a base radial sagittal power, and a center of curvature (244) located on the first optical axis (219); and an annular region (203, 303), wherein at a point halfway along the width of the annular region (203, 303), the annular region (203, 303) has a radial curvature power of X, where X is greater than the base radial curvature power, and the annular region (203, 303) has an off-axis center of curvature (243) that is a first distance from the optical axis (219) such that the annular region (203, 303) has a radial sagittal power of Y at a half-width point, where Y is greater than the base radial sagittal power and where Y is less than X. [2] Contact lens (201, 301) according to one of the preceding claims, wherein the radial-sagittal refractive power of the annular region (203, 303) is greater than the radial-sagittal refractive power of the central region (205, 305) across the width of the annular region (203, 303). [3] Contact lens (201, 301) according to one of the preceding claims, wherein the radial sagittal refractive power of the annular region (203, 303) increases radially outwardly across the width of the annular zone (203, 303). [4] Contact lens (201, 301) according to one of the preceding claims, wherein X is between +0.5 D and +20.0 D. [5] Contact lens (201, 301) according to one of the preceding claims, wherein Y is between +0.5 D and +10.0 D. [6] Contact lens (201, 301) according to any one of claims 2 to 5, wherein there is a sharp increase in radial-sagittal refractive power at the boundary between the central region (205, 305) and the annular region (203, 303). [7] A contact lens (201, 301) according to any one of the preceding claims, wherein Y is approximately +2.0 D greater than the base radial sagittal power. [8] A contact lens (201, 301) according to any one of the preceding claims, wherein X is about +10.0 D greater than the base radial curvature power. [9] Contact lens (301) according to one of the preceding claims, wherein the radial curvature power varies with the meridian around the annular region (303) between a minimum value X1 and a maximum value X2. [10] The contact lens (301) of claim 9, wherein both X1 and X2 are greater than the base radial curvature power. [11] A contact lens (301) according to claim 9 or claim 10, wherein the radial curvature power varies periodically around the annular region (303). [12] The contact lens (301) of claim 11, wherein the periodic variation is defined by a sinusoidal waveform, a triangular waveform, or a sawtooth waveform. [13] Contact lens (301) according to one of the preceding claims, wherein the radial-sagittal refractive power of the annular region (303) varies with the meridian around the annular region (303) between a maximum value Y1 and a minimum value Y2. [14] The contact lens (301) of claim 13, wherein both Y1 and Y2 are greater than the base radial sagittal power. [15] A contact lens (301) according to claim 13 or claim 14, wherein the radial-sagittal power varies periodically around the annular region (303). [16] The contact lens (301) of claim 15, wherein the variation is defined by a sinusoidal waveform, a triangular waveform, or a sawtooth waveform. [17] Contact lens (201, 301) according to one of the preceding claims, wherein the base refractive power of the lens is between 0.5 D and -15.0 D. [18] Contact lens (201, 301) according to one of the preceding claims, wherein the base refractive power of the central region results from a curvature of an anterior surface and / or posterior surface of the lens. [19] Contact lens (201, 301) according to one of the preceding claims, wherein the radial curvature power of the annular region (203, 303) results from the curvature of an anterior surface and / or posterior surface of the lens (201, 301). [20] Contact lens (201, 301) according to any one of the preceding claims, wherein the lens (201, 301) comprises an elastomer material, a silicone elastomer material, a hydrogel material or a silicone hydrogel material or mixtures thereof. [21] Contact lens (201, 301) according to one of the preceding claims, wherein the lens (201, 301) is manufactured by a turning process or a casting process. [22] A method for producing a contact lens (201, 301), the method comprising: Forming a contact lens (201, 301) according to any one of the preceding claims.
Citation Information
Patent Citations
Ophthalmic lens with an optically non-coaxial zone for myopia control
US20190227342A1