Sinusoidal Amplitude Modulated Intraocular Lens for Extended Depth of Focus
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Solution Overview
Problem
Conventional intraocular lenses (IOLs) fail to provide adequate focus for intermediate distances, a common requirement for elderly patients, as they primarily focus on distance and near vision correction, leaving a gap in extended functional vision needs.
Innovation Solution
The development of ophthalmic lenses with sinusoidal optic designs incorporating amplitude and frequency modulation techniques to enhance depth of focus, allowing for improved vision over a range of distances by concentrating light energy to a single focal plane and varying effective lens power with pupil radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional IOL designs focus on distance and near vision correction, then clear distance vision and near vision are achieved, but intermediate distance vision is insufficient
Solution Approach 1:
The IOL optic is segmented into multiple focal points through diffractive zones that create distinct focal planes for distance, intermediate, and near vision. This segmentation allows the lens to provide multiple discrete focus points rather than a single focal point, thereby expanding the functional vision range while maintaining focus accuracy at each segment.
Solution Approach 2:
The patent introduces a longitudinal dimension to focus by creating multiple focal planes at different depths along the optical axis. Instead of focusing only on lateral resolution, the lens extends focus across three-dimensional space by distributing light energy to create focal points at various distances, thereby providing extended depth of focus from distance to near vision.
2Adaptability or versatility
If multifocal IOL designs are used to provide far and near vision, then multiple focal points are achieved, but intermediate distance vision and extended functional vision remain insufficient
Solution Approach 1:
Different zones of the IOL optic are assigned different local qualities with varying diffractive patterns and focal powers. The optic contains regions optimized for distance vision, intermediate vision, and near vision, with each local zone providing enhanced focus accuracy for its specific focal range. This local optimization ensures that intermediate distance vision receives dedicated attention rather than being an afterthought.
Solution Approach 2:
The IOL design incorporates dynamic light distribution that adapts to viewing conditions. The diffractive optic dynamically directs light energy to appropriate focal planes based on the object distance, providing accurate intermediate focus when needed while maintaining overall multifocal functionality. This dynamic behavior allows the lens to prioritize intermediate vision under appropriate conditions.
3Measurement precision
If sinusoidal optic designs with amplitude modulation are used to concentrate light energy, then depth of focus is enhanced, but light distribution uniformity may be affected
Solution Approach 1:
The IOL optic employs sinusoidal amplitude modulation with periodic variations in light transmission across the optic aperture. This periodic modulation pattern creates constructive and destructive interference that concentrates light energy at specific focal planes while maintaining a controlled distribution pattern. The periodic nature of the modulation ensures predictable and stable light energy distribution across different focal depths, enhancing depth of focus without creating chaotic light patterns.
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
These lenses provide an extended depth of field with sufficient contrast for image resolution across a range of defocus distances, reducing the need for spectacles post-cataract surgery and improving visual performance by minimizing the impact of residual refractive errors.
Implementation Method 1
embodiments of the present invention incorporate amplitude modulation and frequency modulation techniques to provide enhanced depth of focus
Implementation Method 2
embodiments of the present invention incorporate amplitude modulation and frequency modulation techniques to provide enhanced depth of focus
Implementation Method 3
Based on a classical sinusoidal technique, embodiments of the present invention incorporate amplitude modulation and frequency modulation techniques
Implementation Method 4
The present invention provides ophthalmic lenses that exhibit extended depth of field while providing sufficient contrast for resolution of an image over a selected range of defocus distances
Data Source
AI summary
An ophthalmic lens is disclosed, one embodiment comprising an optic having an anterior surface and a posterior surface disposed about an optical axis, wherein at least one of the surfaces has a profile characterized by superposition of a base profile and an auxiliary profile, the auxiliary profile comprising a continuous pattern of surface deviations from the base profile. The auxiliary profile is a sinusoidal profile and can be amplitude modulated, frequency modulated or both amplitude and frequency modulated. The ophthalmic lens can be an IOL.