Refractive EDOF Intraocular Lens with 60-Degree Segments
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Solution Overview
Problem
Current intraocular lenses (IOLs) have a fixed focal length and aperture, limiting their ability to adjust for varying object distances, resulting in the need for prescription glasses for intermediate or near vision, and fail to provide continuous vision with minimal halos and glare from far to near distances.
Innovation Solution
A refractive extended depth of focus (EDOF) IOL with a 60-degree segment design and optimized spherical aberration across zones, allowing for continuous vision from far to near distances with minimized halos and glare, and enabling zonal modification for adjustable depth of focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed focal length and aperture IOL is used, then the lens structure is simple and easy to manufacture, but the vision distance is limited and prescription glasses are needed for intermediate or near objects
Solution Approach 1:
The IOL optic is divided into multiple concentric zones with different optical powers. The central zone provides distance vision, the intermediate zone provides intermediate vision, and the peripheral zone provides near vision. This segmentation allows the lens to provide multiple focal points simultaneously, enabling continuous vision from distance to near without requiring the user to wear prescription glasses for different viewing distances.
Solution Approach 2:
Different regions of the IOL optic are assigned different optical properties. The central region has one optical power optimized for distance vision, while the peripheral regions have different optical powers optimized for intermediate and near vision. This local differentiation of optical quality allows each zone to perform its specific function while collectively providing continuous vision across all distances.
2Object-affected harmful factors
If conventional IOL designs are used, then the lens design is simple, but halos and glare are not minimized
Solution Approach 1:
The IOL design incorporates dynamic optical properties that adapt to pupil size and lighting conditions. The relative contribution of different zones to the overall vision changes dynamically based on ambient light levels and pupil diameter. In bright light with small pupils, the central distance vision zone dominates. In dim light with dilated pupils, the intermediate and near zones become more active, providing continuous vision while minimizing halos and glare through optimized zone transitions.
3Adaptability or versatility
If a single focal length IOL is used, then the optical system is simple, but continuous vision from far to near distances cannot be achieved
Solution Approach 1:
The IOL is designed as a multi-functional optical device that simultaneously provides distance, intermediate, and near vision capabilities within a single lens structure. The concentric zone design with different optical powers allows the lens to perform multiple vision functions at the same time, eliminating the need for separate monofocal or multifocal lenses and prescription glasses for different viewing distances.
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 EDOF IOL provides continuous vision from far to near distances with reduced halos and glare, maintaining image quality and contrast across different pupil sizes and light conditions, and allows for adjustable focus from distant to intermediate vision without the need for prescription glasses.
Implementation Method 1
refractive extended depth of focus (EDOF) IOL with a 60-degree segment design and optimized spherical aberration across zones
Data Source
AI summary
The lens of invention has been proven most suitable for the cataract patients. The invention provides extended depth of focus to get continuous vision from far to near distance up to closer distances. The third zone 60 degree segment design of invention is to provide balanced energy distribution at larger pupil diameter and the controlled spherical aberration at each zone provides minimalistic glares and halos. Further the EDOF IOL balances the nominal power and provide pupil independence further optimizing energy distribution in each annular zone to maintain the good contrast irrespective of the pupil size and light condition. Further, zonal modification in the IOL can be used as a controllable switch to change the depth of focus according to the requirement, viz. from distant to near vision or distant to intermediate vision.