High-Definition Intraocular Lens With Continuous Aspheric Power
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Solution Overview
Problem
Conventional optical lens solutions for extending depth of focus, such as diffractive and refractive multifocal lenses and aspheric lenses, suffer from sensitivity to pupil size changes, visual artifacts like halos, and inadequate focus across different zones, leading to suboptimal vision quality.
Innovation Solution
An intraocular lens (IOL) configuration that optimizes parameters like optical zone diameter, radius of curvature, and alpha coefficients to enhance depth of focus, minimize poor performance zones, and reduce aberrations, using a virtual aperture and subsurface modifications to distribute light evenly across the retina.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If discrete zones are used in multifocal lenses, then depth of focus is extended, but sensitivity to pupil size changes increases
Solution Approach 1:
The patent transitions from discrete zone configurations to continuous aspheric surface modifications, changing the fundamental parameter of optical power distribution. The aspheric constant K and higher-order aspheric coefficients are optimized to create a continuous power profile that maintains extended depth of focus while being insensitive to pupil size variations, as the continuous surface maintains consistent optical characteristics across different pupil diameters.
Solution Approach 2:
The patent applies local quality by optimizing the aspheric power profile at different radial zones of the lens. The conic constant K and higher-order aspheric coefficients are specifically tuned to create different focal characteristics at different distances from the optical axis, allowing simultaneous optimization for multiple focal distances without the discrete zone boundaries that cause pupil-size sensitivity.
2Duration of action of moving object
If multiple zones are used in multifocal lenses, then depth of focus is extended, but visual artifacts such as halos increase
Solution Approach 1:
The patent merges the functions of multiple discrete zones into a single continuous aspheric surface. Instead of having separate zones for different focal distances that create boundaries and halos, the aspheric surface provides a smooth, continuous transition of optical power across the entire lens aperture, eliminating the boundaries that generate visual artifacts while maintaining extended depth of focus.
Solution Approach 2:
The patent changes from discrete zone indexing to continuous aspheric parameter optimization. By using optimized conic constants K and higher-order aspheric coefficients, the patent creates a continuous power distribution that eliminates the step-function boundaries inherent in multi-zone designs, thereby removing the source of halos and other visual artifacts.
3Duration of action of moving object
If discrete zones are used in multifocal lenses, then depth of focus is extended, but focus quality varies across zones
Solution Approach 1:
The patent optimizes the aspheric power profile parameters (conic constant K, higher-order aspheric coefficients) to ensure uniform focus quality across the entire lens aperture. The continuous aspheric surface is specifically designed so that every radial zone contributes optimally to the overall focal performance, eliminating the variability in focus quality that occurs with discrete zones where some zones may be over or under-powered relative to the pupil size.
4Duration of action of moving object
If aspheric lens shape is used, then depth of focus is extended, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the aspheric parameters (conic constant K and higher-order coefficients) to achieve extended depth of focus while maintaining manufacturability. The optimization process balances the complexity of the aspheric surface with practical manufacturing capabilities, selecting parameter values that provide the desired optical performance without requiring excessively precise manufacturing tolerances that would be difficult to achieve in standard IOL fabrication processes.
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 IOL provides improved vision quality by reducing monochromatic and chromatic aberrations, increasing depth of field, and ensuring robust performance against de-centration and surgical errors, with enhanced clarity and reduced visual artifacts.
Implementation Method 1
an intraocular lens (IOL) configuration that optimizes parameters like optical zone diameter, radius of curvature, and alpha coefficients to enhance depth of focus, minimize poor performance zones, and reduce aberrations
Data Source
AI summary
Disclosed is a configuration for a lens optimized, enhanced or improved for a desired extended depth of focus, extended depth of field or other characteristic(s) of the lens. The disclosed systems and methods enable a choice of a lens parameter, such as an optical zone diameter, radius of curvature, conic constant and alpha coefficients, to maximize or otherwise enhance one or more characteristics of the lens.