Refractive EDOF Intraocular Lens for Pupil-Independent Continuous Vision
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Solution Overview
Problem
Existing intraocular lenses (IOLs) after cataract surgery provide limited focal adjustment, necessitating the use of prescription glasses for intermediate and near vision, and suffer from issues like halos and glares due to fixed focal length and aperture.
Innovation Solution
A refractive EDOF IOL with a 60-degree segment design and optimized energy distribution across concentric zones, allowing continuous vision from far to near distances with minimized glares and halos, and a controllable switch for focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed focal length IOL is used, then the lens structure is simple, but the vision distance is limited and requires prescription glasses for other distances
Solution Approach 1:
The IOL optic is divided into multiple concentric zones with different optical powers. The central zone provides distance vision, while surrounding annular zones provide intermediate and near vision, enabling multi-focal functionality through spatial segmentation of the optical surface
Solution Approach 2:
Different regions of the IOL optic are assigned different local optical properties - the central region has one focal power for distance vision, while annular regions have different focal powers for intermediate and near vision, allowing each zone to optimize for specific viewing distances
2Adaptability or versatility
If a multifocal IOL design is used to extend depth of focus, then the vision range is improved, but halos and glares increase
Solution Approach 1:
The relative aperture ratios of different focal zones are optimized to control light distribution - by adjusting the aperture parameters of each zone, the design maximizes depth of focus while minimizing the intensity of halos and glares through controlled light routing
Solution Approach 2:
The transition zones between different focal regions are designed with gradual refractive index changes to partially diffuse light, reducing the sharp boundaries that cause halos and glares while still maintaining distinct focal points for different distances
3Adaptability or versatility
If the aperture is fixed, then the lens structure is simple, but the focal length cannot be adjusted for different object distances
Solution Approach 1:
The aperture is segmented into multiple zones corresponding to different focal lengths, with each zone acting as an independent optical channel that can be selectively utilized based on viewing distance requirements
Solution Approach 2:
The IOL incorporates dynamic optical properties through variable refractive index zones that can adaptively route light to different focal points based on pupil size and lighting conditions, providing dynamic focal adjustment without mechanical moving parts
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
Provides extended depth of focus from 1.0 D to 3.5 D, maintaining clear vision from far to near distances with reduced glares and halos, and pupil independence.
Implementation Method 1
refractive EDOF intraocular lens (IOL) with an extended depth of focus (EDOF), and can be used to see the near to distant objects and allow the continuous vison
Data Source
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AI summary
The present invention relates to intraocular lens. More specifically this invention is related to the intraocular lens (IOL) with continuous vision, along with extended depth of focus (EDOF) which provides continuous vision to the cataract patients from far distance to near distance objects with minimized halos and glare. The main advantage of the present invention of novel refractive EDOF intraocular lens for continuous vision to provide extended depth of focus to get continuous vision from far distance to near distance around 40-35 cm closer distance. The haloes and glares are minimized by optimizing the spherical aberration at each zone of the anterior surface of the IOL. The fourth zone 60 degree segment design of invention is to provide balanced energy distribution at larger pupil diameter and makes the lens pupil independent for the power distribution. The lens power and its extended depth of focus are independent from the pupil size or light conditions. 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.