Ophthalmic Lens Surface Modification via Modifying Surfaces
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Solution Overview
Problem
Current methods for customizing ophthalmic lenses require repetitive optimization of multiple optical designs, making them inefficient and time-consuming, especially when adapting to specific wearer needs without significantly altering the initial design.
Innovation Solution
A computer-based method that modifies the initial dioptric function of an ophthalmic lens surface by combining modifying surfaces with the initial surface, allowing for targeted customization of optical functions while minimizing changes to the original design, thereby reducing the need for extensive redesign and optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional customization methods are used to adapt optical lenses to specific wearer needs, then the optical function can be tailored to the wearer, but the design and optimization process becomes time-consuming and inefficient due to repetitive work for each design
Solution Approach 1:
The optical lens surface is divided into an initial surface and multiple modifying surfaces, each with specific functions. The modifying surfaces are segmented by optical zones (distance, intermediate, near vision zones) and can be independently selected and combined to create customized lens designs without redesigning the entire lens from scratch.
Solution Approach 2:
The initial surface and modifying surfaces are pre-optimized with standard dioptric functions and characteristics before actual lens customization. This preliminary optimization allows rapid assembly of customized lenses by simply combining pre-prepared surface components, eliminating repetitive optimization work for each custom design.
2Adaptability or versatility
If extensive modifications are made to customize the optical lens, then specific wearer needs can be met, but the original design integrity is compromised and requires complete redesign
Solution Approach 1:
The lens surface is segmented into functional zones with dedicated modifying surfaces for each zone. This allows targeted customization in specific areas (e.g., only modifying the near vision zone) while preserving the integrity and design of other zones, reducing overall design complexity.
Solution Approach 2:
Different modifying surfaces with specific dioptric characteristics are applied to different local zones of the lens according to the wearer's needs. Each zone maintains its specific optical quality while contributing to the overall customized function, avoiding the need to redesign the entire lens.
3Adaptability or versatility
If multiple optimizing surfaces are combined to achieve customization, then flexible optical functions can be added, but the manufacturing and design process becomes more complex
Solution Approach 1:
Multiple modifying surfaces are mathematically combined and merged into a single functional surface that can be directly used for manufacturing. The combination of modifying surfaces and the initial surface creates a unified lens design that maintains manufacturing simplicity while achieving flexible optical customization.
Solution Approach 2:
The initial surface and modifying surfaces are designed with universal applicability, where a single initial surface can work with multiple different modifying surfaces to create various customized lens designs. This multi-functionality reduces the need for separate manufacturing processes for different lens types.
Data Source
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AI summary
A method implemented by computer means of modifying an initial dioptric function of an initial ophthalmic lens surface, for manufacturing an ophthalmic lens, the method comprising: - an initial surface providing step (S1), during which an initial surface Sini associated with a first coordinate system is provided, said initial surface Sini comprising a plurality of surface points P1, each surface point P1 having a mean sphere Sph(P1) and a cylinder Cyl(P1), said initial surface Sini providing said initial dioptric function, - a modifying surface selection step (S2), during which a number n of nonzero modifying surfaces Smod1,…, Smod n is selected, said modifying surfaces Smod1,…, Smod n being associated with a second coordinate system, the modifying surface Smod 1 comprising a plurality of surface points P i1, …P i j, …, P i mi, each surface point P i j having a mean sphere Sph(P i j ) and a cylinder Cyl(P i j ), n, i, j, m i being integers with n ≥ 1, 1 ≤ i ≤ n, 1 ≤ j ≤ m i and m i ≥ 1, - an orientation step (S3), during which the relative position and orientation of the first coordinate system and the second coordinate system is determined, a combining step (S4), during which the initial surface Sini and the n modifying surfaces are combined to obtain a functionalized ophthalmic lens surface according to the expression : Sfunc = Sini +∑i=n i=1 alphai.S modi. wherein the normalized sphere standard deviation of the normalized sphere values Sph' Smodi of a normalized modifying surface SNmod i is smaller than or equal to 0.2, with : the normalized modifying surface SNmod i corresponding to the modifying surface Smod i to which the best sphero-toric surface has been subtracted, and the normalized sphere values over the normalized modifying surface SNmod i at a point P ij of Smod i having the coordinate (x,y,z) being : (I) Sph N Smod,i (x,y) being the sphere over the normalized modifying surface SNmod i, at the point of SNmod i having the coordinate (x,y), 30 max(Sph N Smod,i ) being the greatest value of sphere over the normalized modifying surface SNmod i, min(Sph N Smod,i ) being the smallest value of sphere over the normalized modifying surface SN mod i, alpha i being a nonzero weighting coefficient.