Intraocular Lens Dual-Sided Overlapping Optical Sectors
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Solution Overview
Problem
Intraocular lenses (IOLs) fail to provide effective reading capabilities, especially at low light conditions and with narrow pupils, as the additional optical power for near vision becomes less effective, resulting in only distance vision being available, which is unfavorable.
Innovation Solution
The IOL design includes a second additional optical active part on the posterior side with a positive relative optical power and/or aberration, positioned to overlap with the first additional optical active part, enhancing reading ability and depth of focus at narrow pupil sizes without compromising distance vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a first additional optical active part is provided on the anterior side for near vision, then near vision capability is improved, but reading capability at narrow pupil sizes deteriorates
Solution Approach 1:
The optic is divided into multiple functional zones: a main lens for distance vision, a first additional optical active part on the anterior side for near vision, and a second additional optical active part on the posterior side that overlaps with the first additional part. This segmentation allows each zone to contribute to different viewing conditions, with the overlapping posterior part ensuring near vision effectiveness even when the pupil is narrow and only transmits light through the central region.
Solution Approach 2:
The solution moves from a single-sided additional power design to a dual-sided design by adding a second additional optical active part on the posterior side of the optic. This dimensional change allows the near vision function to be present on both the anterior and posterior surfaces, creating a more robust near vision capability that works effectively across different pupil sizes by utilizing the overlapping optical paths.
2Adaptability or versatility
If the first additional optical active part is positioned at a distance from the optical axis, then near vision is provided, but effectiveness at narrow pupils deteriorates
Solution Approach 1:
The optic is divided into multiple functional zones: a main lens for distance vision, a first additional optical active part on the anterior side for near vision, and a second additional optical active part on the posterior side that overlaps with the first additional part. This segmentation allows each zone to contribute to different viewing conditions, with the overlapping posterior part ensuring near vision effectiveness even when the pupil is narrow and only transmits light through the central region.
Solution Approach 2:
Different regions of the optic are given different optical properties: the main lens provides distance vision power, while the first and second additional optical active parts provide near vision power. The overlapping region between the first and second additional parts creates a localized zone of enhanced near vision capability that is effective for narrow pupils, as this overlapping region ensures near vision function is present even in the central optical path.
3Reliability
If a second additional optical active part is added on the posterior side, then reading capability at narrow pupils is improved, but device complexity increases
Solution Approach 1:
The first and second additional optical active parts are merged in space to create an overlapping region. This merging allows the near vision function to be achieved through the combination of anterior and posterior surface features, providing robust near vision capability for narrow pupils while maintaining a relatively integrated optic structure rather than requiring completely separate optical components.
Solution Approach 2:
The second additional optical active part on the posterior side serves multiple functions: it provides near vision power for narrow pupils, overlaps with the first additional part to enhance near vision effectiveness, and integrates with the main lens structure. This multi-functionality reduces the need for additional separate components while achieving the desired reading capability at narrow pupil sizes.
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 design improves reading capabilities and depth of focus at narrow pupil sizes while maintaining distance vision, with the second additional optical active part providing additional optical power and/or aberration, effectively addressing the limitations of existing IOLs.
Implementation Method 1
a first additional optical active part at the first side, the first additional optical active part providing a positive relative optical power with respect to the first main lens surface optical power
Implementation Method 2
a second additional optical active part at the second side, the second additional optical active part providing a relative optical power and/or an optical aberration with respect to (the optical power and/or an optical aberration of) the second main lens surface
Implementation Method 3
a second additional optical active part at the second side, the second additional optical active part providing a relative optical power and/or an optical aberration with respect to (the optical power and/or an optical aberration of) the second main lens surface
Implementation Method 4
the distance between the main optical axis and the first additional optical active part is smaller than the diameter of the circle circumscribing the second additional optical active part such that the second optical active part at least partly overlaps with the first additional optical active part
Data Source
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Figure 5
AI summary
An intraocular lens (1) comprises an optic (3) having first and second sides (3.1, 3.2). The optic has a first main lens surface (4.1) at the first side and a second main lens surface (4.2) at the second side, the first main lens surface providing a first main lens surface optical power and the second main lens surface providing a second main lens surface optical power, the first and second main lens surfaces providing a main lens having a main lens optical power and a main optical axis (R) defining radial, tangential and axial directions. Further, the optic has a first additional optical active part (6) at the first side, the first additional optical active part providing a positive relative optical power with respect to the first main lens surface optical power, and additionally the optic has a second additional optical active part (15) at the second side, the second additional optical active part at least partly overlapping with the first additional optical active part and the second additional optical active part providing a relative optical power and/or an optical aberration with respect to the second main lens surface.