Ophthalmic Lens Spherical Aberration Matching for Presbyopia
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Solution Overview
Problem
Current approaches for treating presbyopia often introduce unwanted aberrations like coma and prism due to lens decentration, and there is ongoing debate about whether to fully or partially correct spherical aberration, with most methods providing limited improvements in vision correction.
Innovation Solution
The method involves determining and providing ophthalmic corrections, such as contact lenses, intraocular lenses, or corneal surgeries, that introduce spherical aberration of the same sign and magnitude as the patient's eye to achieve desired multifocality, minimizing aberrations and maximizing image quality by matching the eye's inherent aberration, thereby enhancing near vision while preserving distance vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spherical aberration is introduced to provide multifocality, then near vision is improved, but unwanted aberrations like coma and prism are introduced due to lens decentration
Solution Approach 1:
The patent changes the parameter of spherical aberration magnitude in the lens design to match the patient's eye characteristics. By measuring the patient's inherent spherical aberration and designing the lens to complement it, the system achieves multifocality while minimizing unwanted aberrations from decentration.
Solution Approach 2:
The patent applies different optical properties to different zones of the lens. The lens design incorporates varying power distributions and spherical aberration characteristics in different regions to simultaneously provide distance and near vision correction while accounting for the patient's specific eye aberrations.
2Adaptability or versatility
If conventional multifocal lenses are used, then simultaneous near and distance correction is achieved, but decentration introduces coma and other aberrations
Solution Approach 1:
The patent performs preliminary measurement of the patient's inherent spherical aberration before lens design. By knowing the patient's baseline aberration characteristics, the lens can be pre-configured to complement these aberrations, reducing the impact of decentration-induced coma and other unwanted aberrations during actual use.
3Manufacturing precision
If complete spherical aberration correction is applied, then image quality improves, but larger amounts of spherical aberration must be introduced to achieve multifocality
Solution Approach 1:
The patent converts the patient's inherent spherical aberration, traditionally considered a defect to be corrected, into a beneficial resource. By designing the lens to work with the patient's existing spherical aberration rather than eliminating it, the system achieves multifocality with smaller additional spherical aberration, thereby maintaining image quality while achieving presbyopia correction.
Data Source
AI summary
Certain exemplary embodiments include methods of determining ophthalmic prescriptions to ameliorate presbyopia. Certain exemplary embodiments provide an ophthalmic lens having spherical aberration of the same sign as the patient's eye and of a magnitude effective to substantially provide a desired net spherical aberration for an optical system including the patient's eye and the ophthalmic lens where the desired net spherical aberration provides a desired increase in near vision. Certain exemplary embodiments include contact lenses, intraocular lenses, corneal onlays, corneal inlays, or corneal surgeries providing spherical aberration of the same sign as the patient's eye and of a magnitude effective to substantially provide a desired net spherical aberration for an optical system including the patient's eye and the ophthalmic lens where the desired net spherical aberration provides a desired increase in near distance vision.