Multifocal Ophthalmic Lens with Stabilized Optical Power Zone
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Solution Overview
Problem
Existing multifocal ophthalmic spectacle lenses fail to provide clear both ophthalmic and supplementary visions simultaneously, as the optical characteristics for ophthalmic and supplementary images differ, leading to unclear images on the retina.
Innovation Solution
A method for calculating the geometry of a multifocal ophthalmic lens with a light guide optical element, where the exit surface, back surface, and optical material form an optical device with an area of stabilized optical power, defined by an angular aperture contour, ensuring clear vision across various gaze directions without changing accommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a light guide optical element is inserted to provide supplementary vision, then supplementary information can be viewed, but the optical characteristics for ophthalmic and supplementary images differ causing unclear images on the retina
Solution Approach 1:
The lens is divided into distinct functional zones: an ophthalmic vision zone for clear vision correction and a supplementary image zone for displaying additional information. This segmentation allows each zone to be optimized independently, with the ophthalmic zone maintaining proper refractive power for clear retinal imaging while the supplementary zone delivers additional information without compromising the primary vision function.
Solution Approach 2:
Different regions of the lens are assigned different optical properties. The ophthalmic zone has optimized refractive characteristics for clear vision, while the supplementary image zone has tailored optical characteristics suitable for displaying additional information. This local differentiation ensures that each function performs optimally without interfering with the other.
2Adaptability or versatility
If the angular aperture contour is expanded to cover more gaze directions (α, β variation ≥ 5°), then the field of view for supplementary image is improved, but the optical power stability becomes more challenging to maintain
Solution Approach 1:
The optical design dynamically adapts to different gaze directions by incorporating the angular aperture contour AC(α,β) that defines specific ranges of eye declination angles (α) and eye azimuth angles (β). The optical characteristics are optimized for this defined angular range, allowing the lens to maintain functional performance across multiple gaze directions while preserving optical power stability within the stabilized zone.
3Loss of information
If the exit surface is positioned to maximize supplementary image visibility, then supplementary vision is improved, but the dioptric power varies significantly across different gaze directions
Solution Approach 1:
The problem is solved by transitioning from a two-dimensional surface positioning problem to a three-dimensional angular space solution. The exit surface is positioned and oriented within a defined angular aperture contour AC(α,β) that specifies ranges of eye declination angles (α) and eye azimuth angles (β). This angular dimensioning allows the supplementary image to be visible across multiple gaze directions while the optical power remains stabilized through the defined angular constraints.
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
Enables comfortable viewing of a scene and supplementary images simultaneously, with the optical device maintaining clear ophthalmic vision and providing informative supplementary data within the field of vision, meeting specific dioptric power and astigmatism requirements.
Implementation Method 1
the exit surface, the back surface and an optical material located between said exit surface and said back surface form an optical device
Implementation Method 2
Said light-guide optical element is a device designed to transport light from a light source (for example light beam generator system) to the wearer's eye to enable information content to be viewed with minimal loss of information
Implementation Method 3
the exit surface is defined by an angular aperture contour, denoted AC(α,β), α being the eye declination angle and β being the eye azimuth angle
Data Source
Figure 1a~1b
Figure 2~3
Figure 4a~5
AI summary
A multifocal ophthalmic spectacle lens (10) capable of correcting a wearer's ophthalmic vision and having a back surface (BS) and a front surface (FS), said lens comprising a light guide optical element arranged to output a supplementary image (SI) to the wearer through an exit surface (ES) of said light guide optical element, where the exit surface (ES), the back surface (BS) and an optical material located between said exit surface (ES) and said back surface (BS) form an optical device (OD) and wherein said optical device (OD) comprises an area of stabilized optical power.