Calculation Module for Ophthalmic Lens Blank Selection

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Solution Overview

Problem

The challenge lies in selecting a semi-finished lens blank that matches the parameters of a preselected eyewear frame, ensuring optimal aesthetics and functionality, while existing methods rely on base-curve matching and user prescription, which can be cumbersome and aesthetically challenging.

Innovation Solution

A calculation module and method that determine a geometrical parameter value for an ophthalmic lens based on the base-curve, refractive index, user prescription, and frame characteristics, allowing for the selection of an adapted semi-finished lens blank that meets specific aesthetic and functional criteria.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If base-curve matching method is used to select lens parameters, then the selection process is simplified, but the aesthetic quality of the final eyewear deteriorates

Engineering Contradiction:

Improveease of lens selectionVSAvoidaesthetic quality

Core Design Contradiction:

Ease of operationVSShape

Solution Approach 1:

The patent transforms the aesthetic selection process from a subjective visual evaluation into an objective parameter-based calculation. By defining geometric parameters (lens curvature, frame curvature, bridge width, lens width) and establishing mathematical relationships between them, the system automatically determines optimal lens configurations that satisfy aesthetic criteria without requiring manual evaluation of numerous combinations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a calculation module as an intermediary between the frame selection and lens manufacturing processes. This module receives frame parameters and prescription data, then computes the optimal lens geometric parameters that ensure aesthetic integration. The calculation module acts as a mediator that translates frame characteristics into corresponding lens specifications, eliminating the need for manual aesthetic evaluation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Shape

If multiple parameter combinations are evaluated to optimize aesthetics, then the aesthetic quality improves, but the complexity of the selection process increases

Engineering Contradiction:

Improveaesthetic qualityVSAvoidselection process complexity

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The patent reduces the complexity by transforming the aesthetic evaluation from a multi-parameter manual assessment into a streamlined calculation based on key geometric parameters. By identifying the critical parameters (lens curvature, frame curvature, bridge width, lens width) and establishing direct mathematical relationships, the system evaluates aesthetic quality through focused parameter analysis rather than exhaustive combination testing.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the manual mechanical process of evaluating numerous parameter combinations with an automated computational system. The calculation module performs the aesthetic evaluation through algorithmic processing of geometric parameters, substituting the complex manual assessment process with a deterministic calculation that efficiently determines optimal lens configurations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Shape

If deep knowledge is required to evaluate aesthetics of lens-frame combinations, then the aesthetic quality improves, but the ease of operation deteriorates

Engineering Contradiction:

Improveaesthetic qualityVSAvoidease of lens selection

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

The patent enables the system to perform aesthetic evaluation autonomously without requiring expert knowledge from the operator. The calculation module contains embedded geometric relationships and aesthetic criteria that allow it to independently determine optimal lens parameters based on frame characteristics and prescription data, making the process accessible to users without specialized aesthetic evaluation skills.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The calculation module serves as an intermediary that encapsulates the expert aesthetic evaluation knowledge within its algorithms. By transferring the specialized knowledge into the computational system, the patent allows ordinary users to access expert-level aesthetic evaluation capabilities through automated calculation, eliminating the need for users to possess deep aesthetic knowledge.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250180923A1Calculation module and computer implemented method configured to select a semi-finished lens blank

Publication Date: 2025.06.05 ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)

AI summary

Calculation module comprising a memory and a processor. The calculation module is configured to select an adapted semi-finished lens blank among a plurality of semi-finished lens blanks for manufacturing an ophthalmic lens to be mounted in a frame of an eyewear. The eyewear is intended to be worn by a user. The calculation module is configured to determine a geometrical parameter value of the ophthalmic lens to be manufactured from a test semi-finished lens blank of the plurality, the geometrical parameter value of the ophthalmic lens depending on a base-curve of the test semi-finished lens blank, a refractive index of the test semi-finished lens blank, a prescription of the user and/or a characteristic parameter value of the frame. The calculation module is configured to select the adapted semi-finished lens blank based on the geometrical parameter value of the ophthalmic lens.