Central Pupil Spherical Aberration for Presbyopia Correction
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Solution Overview
Problem
Existing refractive correction methods for presbyopia, such as diffractive intraocular lenses, multifocal designs, and aspheric lenses, suffer from issues like night glare, starburst, and inadequate focus depth for far, intermediate, and near vision, with current spherical aberration methods failing to effectively address these problems.
Innovation Solution
Introducing spherical aberration or a distribution of spherical aberrations specifically in the central pupil of the eye, using corneal implants or lenses with aspheric surfaces, to enhance focus depth and improve vision correction for presbyopia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diffractive intraocular lenses are used to provide simultaneous bi-focus correction, then far vision and near vision correction is improved, but night vision is degraded with glare and starburst effects
Solution Approach 1:
The patent applies local quality by creating different optical zones within the pupil - the central zone (0-2mm) has one aberration profile while the intermediate zone (2-4mm) has a different aberration profile. This allows the central zone to provide sharp focus for distance and near vision, while the intermediate zone provides defocused vision that reduces glare and starburst effects during nighttime.
2Reliability
If spherical aberration is induced across the entire pupil to shift focus range, then intermediate vision is improved, but nighttime symptoms such as glare and starburst are caused
Solution Approach 1:
The patent segments the pupil into multiple concentric zones with different diameters (central zone 0-2mm, intermediate zone 2-4mm). Each zone is assigned a specific spherical aberration profile - the central zone receives a first profile optimized for sharp focus, while the intermediate zone receives a second profile optimized for reducing glare and providing intermediate vision, thereby resolving the contradiction between intermediate vision improvement and nighttime symptom prevention.
3Reliability
If diffractive zones are created in the lens surface to provide multifocus, then presbyopia correction is improved, but light scattering at junctions causes night glare
Solution Approach 1:
The patent changes the parameter of spherical aberration distribution across different pupil zones rather than using traditional diffractive zones. By applying controlled spherical aberration profiles to specific radial zones (0-2mm and 2-4mm), the patent achieves multifocus correction for presbyopia without creating the light scattering problems associated with diffractive zone junctions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed methods increase focus depth by up to 3 Diopters, providing improved vision across various pupil sizes without significantly degrading night vision, and can be applied to devices like contact lenses, intraocular lenses, and refractive corneal inlays.
Implementation Method 1
when implanted in the eye spherical aberration or a distribution of spherical aberrations is created in the central pupil between 1.5 mm and 4.0 mm in diameter only by the presence of said device
Data Source
AI summary
Methods for treating presbyopia in a patient's eye involve inducing spherical aberration in a central area of the pupil. In embodiments, refractive properties of an eye are measured to obtain a baseline refractive correction. A lens for wearing on the eye is provided to create spherical aberration or a distribution of spherical aberrations beyond the baseline refractive correction in the central area of the pupil. The central area of the pupil has a diameter of between 1.5 mm and 4.0 mm and has negligible spherical aberration without the treatment.