Diffractive Multifocal Intraocular Lens for Efficient Light Distribution
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Solution Overview
Problem
Existing multifocal intraocular lenses (IOLs) face challenges in efficiently distributing light to achieve optimal vision across multiple focal distances without compromising contrast or light transmission, particularly in varying light conditions.
Innovation Solution
The design incorporates asymmetrical diffractive steps partially inside and outside the base curvature of the IOL, with variable thickness and curvature, utilizing a Gerchberg-Saxton iterative algorithm to optimize diffractive profiles, resulting in five diffractive orders with specific energy flux levels and suppressed orders to enhance light transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional multifocal IOL designs are used to provide multiple focal distances, then vision across different distances is improved, but light transmission efficiency and contrast are compromised
Solution Approach 1:
The lens is divided into multiple zones with different diffractive profiles (central zone and peripheral zone) that operate independently to provide different focal distances. The central zone uses a first diffractive profile for near vision while the peripheral zone uses a second diffractive profile for far vision, allowing efficient light distribution to multiple focal points without compromising overall light transmission.
Solution Approach 2:
Different regions of the lens are assigned different diffractive characteristics. The central zone has a first diffractive profile optimized for near vision with specific energy flux distribution, while the peripheral zone has a second diffractive profile optimized for far vision. This local differentiation allows each region to optimize light transmission for its specific focal function.
2Manufacturing precision
If diffractive profiles are optimized for specific focal distances, then vision quality at those distances is improved, but light transmission efficiency decreases
Solution Approach 1:
The patent optimizes the energy flux distribution parameters of the diffractive profiles. By carefully controlling the amplitude and phase parameters of the diffractive zones, the system achieves high vision quality at multiple focal distances while maintaining over 90% light transmission efficiency. The asymmetric diffractive profiles are designed with specific energy flux levels to balance focal quality and light transmission.
3Ease of manufacture
If symmetric diffractive profiles are used, then manufacturing is simplified, but vision quality and light distribution efficiency are reduced
Solution Approach 1:
The patent employs asymmetric diffractive profiles in both the central and peripheral zones, with the first and second diffractive profiles having different characteristics optimized for their respective focal distances. This asymmetry enables superior light distribution efficiency and vision quality across multiple focal points, while the overall lens structure remains manufacturable through standardized 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 solution achieves over 90% light transmission efficiency and improved vision quality across far, intermediate, and near distances, even in low-light conditions, by maintaining diffractive profiles and optimizing light distribution.
Implementation Method 1
The multifocal intraocular lens (IOL) utilizes a diffractive surface with a repetitive pattern of diffractive profiles that divide light into multiple focal distances, creating five diffractive orders with specific energy flux levels
Implementation Method 2
The solution achieves over 90% light transmission efficiency and improved vision quality across far, intermediate, and near distances, even in low-light conditions
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A method for determining cross sections of a first diffractive profile for an intra-ocular lens (IOL), said IOL comprising at least one diffractive surface including a plurality of discrete, adjacent, diffractive, concentric Fresnel zones, said method comprising, selecting diffractive orders of said IOL; selecting a normalized first energy flux distribution of said diffractive orders; and employing the Gerchberg-Saxton algorithm to generate cross sections of a first zone comprising a repetitive pattern of a first diffractive profile of said Fresnel zones, said first diffractive profile associated with said first flux distribution of said diffractive orders.