Full-Depth-of-Focus Intraocular Lens with Segmented Aperture Microstructures
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Solution Overview
Problem
Conventional multifocal intraocular lenses (IOLs) fail to provide a full range of vision from near to infinite distance, with bifocal IOLs compromising intermediate distance vision and trifocal IOLs lacking continuity from far to near distances, while extended depth of focus (EDF) IOLs have limited depth of focus extension.
Innovation Solution
A full depth of focus IOL design incorporating diffractive structures on the anterior or posterior surface, with microstructures in the photopic aperture providing presbyopia correction and extending focus from near to infinite distance, and optional bifocal or trifocal designs in the mesopic aperture for enhanced vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multifocal IOLs are used to provide vision at multiple focal planes, then near and intermediate vision are improved, but continuous depth of focus from near to infinite distance is not achieved
Solution Approach 1:
The lens aperture is segmented into two distinct regions: a photopic aperture region for bright light conditions and a mesopic aperture region for dim light conditions. Each region has optimized microstructures tailored to its specific lighting conditions, allowing the lens to provide continuous depth of focus in photopic conditions while maintaining appropriate focus characteristics in mesopic conditions.
Solution Approach 2:
Different regions of the lens aperture are given different optical properties. The photopic aperture region contains microstructures optimized for continuous depth of focus, while the mesopic aperture region contains microstructures optimized for dim light vision. This local differentiation allows each region to perform its specific function optimally without compromising the other.
2Adaptability or versatility
If extended depth of focus IOLs are used to extend the depth of focus, then near vision is improved, but the extension is far too limited to fully correct presbyopia
Solution Approach 1:
The lens dynamically adapts its optical properties based on lighting conditions by utilizing different aperture regions. In photopic (bright light) conditions, the photopic aperture region provides extensive depth of focus extension for continuous vision from near to far. In mesopic (dim light) conditions, the mesopic aperture region provides appropriate focus characteristics. This dynamic adaptation allows the lens to provide full presbyopia correction across different lighting scenarios.
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 design offers a continuous depth of focus from near to infinite distance, improving vision clarity across various distances with high light energy efficiency and resistance to optical disturbances.
Implementation Method 1
A first microstructure pattern formed in a the first surface region, the first microstructure pattern introducing a phase perturbation into an optical path of incoming light such that a full depth of focus for photopic vision is provided
Data Source
AI summary
An ophthalmic lens comprising an anterior surface and a posterior surface, at least one of the anterior surface and posterior surface including a first surface region corresponding to a photopic aperture of a pupil and a second surface region corresponding to a difference between the photopic aperture and a mesopic aperture of the pupil. A first microstructure pattern formed in a the first surface region, the first microstructure pattern introducing a phase perturbation into an optical path of incoming light such that a full depth of focus for photopic vision is provided.