Multifocal Intraocular Lens Diffractive Refractive Profile Integration
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Solution Overview
Problem
Multifocal intraocular lenses often suffer from halo patterns due to the superimposition of out-of-focus and in-focus images, which can be annoying for users and are not effectively addressed by existing technologies.
Innovation Solution
The integration of a multifocal refractive element with a diffractive element within a single optic, where the refractive and diffractive profiles can be on separate or overlapping portions, allowing for a combination of optical powers to enhance vision and reduce halo effects by adjusting light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multifocal diffractive lens is used to provide multiple foci for near and distant vision, then the accommodative ability is improved, but halo patterns appear due to superimposition of out-of-focus and in-focus images
Solution Approach 1:
The patent combines a multifocal diffractive lens with a multifocal refractive lens in a single optical system. The diffractive lens provides multiple foci through diffraction, while the refractive lens provides multiple foci through refraction. By merging these two different optical mechanisms, the system achieves multiple foci while the refractive component helps reduce the halo effects generated by the diffractive component alone.
Solution Approach 2:
The patent uses a composite optical system that integrates two different lens types (diffractive and refractive) with different optical properties. The diffractive lens creates multiple focal points through wavelength-dependent diffraction, while the refractive lens creates multiple focal points through refraction. This composite approach allows the system to maintain multiple foci functionality while reducing the harmful halo patterns through the complementary optical characteristics of the two lens types.
2Adaptability or versatility
If a multifocal refractive lens is used to provide multiple foci, then near and distant vision are improved, but the optical performance is limited compared to combining both diffractive and refractive approaches
Solution Approach 1:
The patent merges the advantages of diffractive optics (which can provide multiple foci with compact design) and refractive optics (which provide smooth focus transitions and reduced chromatic aberrations) into a single integrated lens system. This combination allows the optical system to achieve superior near and distant vision while maintaining high optical performance through the complementary strengths of both lens types.
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
This solution provides improved optical performance by reducing halo images and offering a synergistic balance between near and distant vision, independent of pupil size or lighting conditions, enhancing the overall visual experience.
Implementation Method 1
a diffractive element or profile is provided on at least one surface of the intraocular lens. The diffractive element may be a bifocal or multifocal diffractive element, wherein light within the visible range of the electromagnetic spectrum is directed two or more diffraction orders and/or foci.
Implementation Method 2
a multifocal refractive profile is provided on at least one surface of the intraocular lens
Data Source
AI summary
An intraocular lens for providing a subject with vision at various distances includes an optic having a first surface with a first shape, an opposing second surface with a second shape, a multifocal refractive profile, and one or more diffractive portions. The optic may include at least one multifocal diffractive profile. In some embodiments, multifocal diffractive and the multifocal refractive profiles are disposed on different, distinct, or non-overlapping portions or apertures of the optic. Alternatively, portions of the multifocal diffractive profiles and the multifocal refractive profiles may overlap within a common aperture or zone of the optic.