Cross-Apodized Diffractive Ophthalmic Lens for Pupil-Adaptive Vision
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Solution Overview
Problem
Current multifocal artificial ophthalmic lenses suffer from pupil-size dependent optical performance and abrupt transitions between trifocal and bifocal zones, failing to adapt to varying illumination conditions and vision demands.
Innovation Solution
A diffractive profile with cross apodization that smoothly transitions from trifocal to bifocal performance as the pupil diameter increases, utilizing decreasing and increasing apodization elements that meet at a common intersection point, allowing for a continuous adjustment of intensity distribution and focal points based on pupil size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If diffractive multifocal artificial ophthalmic lenses are used to provide sharp images at multiple distances, then intermediate vision quality improves, but optical performance becomes strongly dependent on pupil size and transitions between focal zones are abrupt
Solution Approach 1:
The patent implements a dynamic optical system where the effective focal points and intensity distribution change continuously with pupil diameter. The apodization profile ensures that as the pupil size varies, the lens automatically adjusts the relative intensities of diffracted orders, providing optimal vision quality across different lighting conditions without abrupt transitions.
Solution Approach 2:
The patent changes the physical parameter of light intensity distribution across the pupil aperture by applying an apodization profile. This gradual variation in transmission intensity across different radial zones of the lens allows smooth transitions between trifocal and bifocal operating modes, eliminating the abrupt switches present in conventional designs.
2Manufacturing precision
If conventional diffractive profiles are used to create multiple foci, then trifocal performance is achieved, but intensity distribution does not vary smoothly with pupil diameter
Solution Approach 1:
The patent applies different transmission characteristics to different local zones of the lens aperture through apodization. Each radial zone has a specifically designed transmission profile that contributes to the overall smooth intensity distribution, allowing precise control over how light is distributed to various focal points at different 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 approach enhances trifocal performance at smaller apertures for better intermediate vision while maintaining moderate trifocal performance at larger apertures, offering improved clinical efficacy by adapting to changing vision demands and illumination conditions.
Implementation Method 1
The diffractive profile with cross apodization that smoothly transitions from trifocal to bifocal performance as the pupil diameter increases
Data Source
AI summary
The invention relates to an artificial ophthalmic lens (20) containing an anterior optical surface (21) and a posterior optical surface (22), at least one of which contains a multifocal optical diffractive profile (25). A cross apodized profile part (25′) is formed on the diffractive profile (25) wherein phase shifting elements (27) are provided alternately forming the elements of a decreasingly apodized series (40) and an increasingly apodized series (41) in such a way that the decreasing and increasing elements of the two series (40, 41) form envelope curves that meet at a common intersection point (45).The invention further relates to a method for the production of such an artificial ophthalmic lens (20).