Multifocal Ophthalmic Lens Phase Profile for Reduced Glare
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Solution Overview
Problem
Existing multifocal ophthalmic lenses face challenges in efficiently distributing light to multiple focal points, leading to issues like glare, halos, and difficulty in measuring and adapting to different pupil sizes, which affects user comfort and accuracy of focus adjustment.
Innovation Solution
Designing an ophthalmic lens with a continuous periodic phase profile function that optimizes light distribution across focal points, using a diffraction grating with a smooth transition from a monofocal central zone to a diffraction grating, allowing for precise measurement and faster adaptation to focal points, reducing manufacturing complexities, and minimizing glare and halos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffraction grating is used to create multiple focal points, then multifocal vision is achieved, but light distribution becomes inefficient causing glare and halos
Solution Approach 1:
The patent applies local quality by creating different optical zones within the lens: a central zone with optimized diffraction properties for near vision and an outer zone for distance vision. This allows different regions of the lens to have different optical characteristics, directing light efficiently to appropriate focal points while minimizing glare and halos through localized light distribution control
2Adaptability or versatility
If multiple diffraction orders are used to provide multiple focal points, then near and far vision are achieved, but measurement and adaptation become difficult
Solution Approach 1:
The patent extracts and eliminates unwanted diffraction orders through optimized grating design. By carefully controlling the diffraction grating parameters, the invention suppresses higher-order diffraction that would create multiple confusing focal points, while maintaining the essential first-order diffraction for near and far vision. This simplifies the optical system to produce clearly distinguishable focal points that are easier to measure and adapt to
3Adaptability or versatility
If a periodic diffraction grating is used, then light is split to multiple focal points, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the diffraction grating's physical parameters (period, depth, profile) to achieve desired light distribution while simplifying manufacturing. By carefully selecting grating parameters such as the period and depth ratios, the invention enables fabrication using standard optical manufacturing techniques rather than requiring complex nanofabrication processes, thus reducing manufacturing complexity while maintaining effective light splitting
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 lens provides improved diffraction efficiency, easier manufacturing, faster user adaptation to focal points, and accurate measurement of focal points, enhancing visual comfort and reducing optical aberrations.
Implementation Method 1
a diffraction grating with a smooth transition from a monofocal central zone to a diffraction grating, allowing for precise measurement and faster adaptation to focal points
Implementation Method 2
Designing an ophthalmic lens with a continuous periodic phase profile function that optimizes light distribution across focal points
Data Source
AI summary
A new generation ophthalmic multifocal lenses and a method of manufacturing same. The lenses at least provide focal points for near, intermediate and far vision. The lens body provides a refractive focal point for intermediate vision. The lens body comprises a diffraction grating operating as an optical wave splitter, providing a diffractive focal point for near vision and a diffractive focal point for far vision. The lens body comprises a monofocal central zone extending over a distance from the optical axis of the lens body, and provides a focal point coinciding with one of the diffractive focal points. The diffraction grating (91) is arranged from a transition point at a radial position of the lens body where the monofocal central zone ends. At the transition point, the diffraction grating and the monofocal central zone have coinciding amplitude values.