Refractive Element Inducing Central Spherical Aberration
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Solution Overview
Problem
Current refractive correction methods for presbyopia, such as diffractive intraocular lenses and multifocal designs, suffer from issues like night glare, blind spots, and inadequate focus depth, particularly for near and intermediate vision, due to limitations in spherical aberration induction and light distribution.
Innovation Solution
The method involves inducing spherical aberration in the central pupil section of the eye while reducing or preserving high-order aberrations in the peripheral section, using a refractive element that restricts pupil size and applies distinct focus power and spherical aberration sets to improve focus depth and image quality across different vision ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diffractive intraocular lenses are used to provide simultaneous bi-focus correction, then near and far vision are improved, but night vision quality deteriorates due to light scattering at diffractive zone junctions
Solution Approach 1:
The patent applies different optical properties to different regions of the lens. The central region (within 3mm radius) has one set of focus power and spherical aberration characteristics, while the peripheral region has different characteristics. This local differentiation allows the central zone to provide sharp focus while the peripheral zone manages light distribution to reduce glare, resolving the contradiction between focus precision and night vision quality.
2Measurement precision
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 halo increase
Solution Approach 1:
The patent restricts spherical aberration induction to the central pupil region only, while preserving natural optical properties in the peripheral region. This localized approach allows the central zone to provide the needed focus shift for intermediate vision without the peripheral zone contributing to glare and halo effects, thus resolving the contradiction between intermediate focus and nighttime symptoms.
Solution Approach 2:
The patent divides the pupil into distinct zones: a central zone (within 3mm radius) where spherical aberration is induced, and a peripheral zone where natural optics are preserved. This segmentation allows independent optimization of each zone's function, enabling intermediate vision improvement in the central zone while maintaining good night vision through the peripheral zone.
3Measurement precision
If spherical aberration is induced in the central pupil section, then focus depth is increased, but high-order aberrations in the periphery may worsen image quality
Solution Approach 1:
The patent applies spherical aberration induction selectively to the central pupil section while explicitly preserving or reducing high-order aberrations in the periphery. This localized application increases focus depth through the central zone's modified optics while the peripheral zone maintains natural, high-quality image formation, resolving the contradiction between focus depth and overall image quality.
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
This approach enhances focus depth and reduces night vision issues like glare, allowing for improved binocular vision and image quality for far, intermediate, and near vision without significant adverse effects on light distribution, effectively addressing the limitations of existing methods.
Implementation Method 1
induction of spherical aberration in the central section of the pupil
Implementation Method 2
a refractive element that restricts pupil size and applies distinct focus power and spherical aberration sets
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
Presbyopia in a patient's eye is treated by inducing spherical aberration in the central section of the pupil, while the peripheral section of the pupil is treated in a manner other than the central section of the pupil. For example, the peripheral section of the pupil may remain untreated, or high-order aberration may be controlled, and/or a second area of spherical aberration may be provided with different focus power.