Custom Diffractive Intraocular Lens Step Heights
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Solution Overview
Problem
Current intraocular lenses with diffractive profiles have fixed step height patterns, limiting control over luminous efficiency and adaptability to individual patient needs, particularly for vision requirements such as far vision for drivers and intermediate vision for office workers.
Innovation Solution
An intraocular lens with a diffractive profile where each step height is individually defined, allowing for a flexible and customizable distribution of light energy across focal points, creating two to four focal points and an extended depth-of-focus without following a fixed apodization or alternation pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed step height patterns are used in diffractive intraocular lenses, then manufacturing is simplified, but control over luminous efficiency and adaptability to individual patient needs is limited
Solution Approach 1:
The patent applies local quality by allowing each step height in the diffractive profile to be individually defined rather than following a fixed pattern. This enables different regions of the lens to have different step heights optimized for specific visual requirements (e.g., distance, intermediate, or near vision), thereby achieving customization for individual patient needs while maintaining manufacturing feasibility through systematic design approaches.
Solution Approach 2:
The patent introduces dynamics by making the step heights variable and adaptable rather than fixed. The diffractive profile can be dynamically adjusted during the design phase to match specific patient requirements, allowing the lens to be customized for different visual scenarios (driving, office work, etc.) while still being manufactured using standardized processes.
2Device complexity
If fixed apodization patterns are used, then lens design is simplified, but control over light energy distribution across focal points is reduced
Solution Approach 1:
The patent applies parameter changes by allowing each step height to be individually defined within specific ranges (e.g., 0.30 μm to 4.5 μm for the first step, with subsequent steps defined as percentages of previous steps). This enables precise control over the distribution of light energy across different diffractive orders and focal points, optimizing visual performance for specific applications while maintaining manageable design complexity through systematic parameter selection.
3Productivity
If standard diffractive profiles are used, then production efficiency is maintained, but vision requirements for specific activities (driving, office work) cannot be optimized
Solution Approach 1:
The patent applies segmentation by dividing the diffractive profile into multiple independently definable steps, where each step height can be individually optimized. This segmentation allows the lens to be customized for specific visual requirements (distance vision for driving, intermediate for office work, near for reading) while still being produced efficiently through standardized manufacturing processes that can accommodate varied step height configurations.
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 provides enhanced control over luminous efficiency, allowing the lens to adapt to specific patient needs, improving vision under various lighting conditions and work environments.
Implementation Method 1
A diffractive multifocal intraocular lens (MIOL) is formed by a profile of steps that causes the incident beam of light to undergo diffraction. In this way the incident beam is decomposed into several secondary beams (called diffractive orders) whose amount of light energy corresponds to a percentage of the incident light energy.
Data Source
AI summary
The present invention refers to an intraocular lens provided with specific diffractive profile, in which each step height is individually defined, with no fixed pattern. The intraocular lens provides a better control of the luminous efficiency of each focal point, guaranteeing more flexibility and customization, being adaptable to the optical quality that the patient needs.