Blue Light Filtering Ophthalmic Lens with db* Value Constraint

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Solution Overview

Problem

Conventional blue light filtering lenses often appear yellowish due to the substances used to block blue light, which deter consumers from purchasing them.

Innovation Solution

A blue light filtering ophthalmic lens with a db* value of 2 or less, incorporating a blue light filtering compound and a base material, where the compound is mixed with the base material in specific concentrations and processed through copolymerization to achieve a blue light filtering rate between 10% to 60% without a yellowish appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If blue light filtering substances are added to the lens to block blue light, then blue light filtering capability is improved, but the lens develops a yellowish appearance

Engineering Contradiction:

Improveblue light filtering capabilityVSAvoidlens appearance color

Core Design Contradiction:

Object-affected harmful factorsVSShape

Solution Approach 1:

The patent changes the chemical parameters of the blue light filtering substance by using a compound with specific structural formula (A) containing adjustable R1, R2, X, and R3 groups. By modifying these structural parameters, the lens achieves effective blue light filtering while maintaining a colorless appearance with db* value of 2.0 or less, resolving the contradiction between filtering capability and appearance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system by combining the blue light filtering compound with a base material in specific concentration ratios (0.4% to 10% of the total composition). This composite approach allows the lens to achieve both blue light filtering functionality and colorless transparency through optimized material composition.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If yellowish substances are used to filter blue light, then blue light protection is improved, but consumer acceptance decreases due to poor appearance

Engineering Contradiction:

Improveblue light protectionVSAvoidconsumer acceptance

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent modifies the optical parameters of the filtering substance by using compound (A) with adjustable structural groups, achieving a db* value of 2.0 or less. This parameter optimization allows the lens to provide blue light protection while maintaining a colorless, cosmetically acceptable appearance that enhances consumer acceptance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent fundamentally changes the color property of the lens by developing a compound that filters blue light without producing the traditional yellowish tint. The lens maintains a colorless appearance (db* ≤ 2.0) while providing effective blue light filtering, directly addressing consumer aesthetic preferences.

Inventive Principle:

Principle #32Color changes

3Object-affected harmful factors

If high concentration of blue light filtering compound is used, then blue light filtering rate is improved, but lens transparency and colorlessness are compromised

Engineering Contradiction:

Improveblue light filtering rateVSAvoidlens transparency

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent optimizes the concentration parameter of the blue light filtering compound within the range of 0.4% to 10% of the total lens composition. This parameter optimization, combined with the specific molecular structure of compound (A), achieves a blue light filtering rate of 10% to 60% while maintaining lens transparency and colorlessness (db* ≤ 2.0).

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses the base material as a control group reference (with db*0 value) and measures the experimental lens performance relative to it. By comparing against the control and maintaining db* = (b*)1 − (b*)0 ≤ 2, the patent ensures the lens transparency and colorlessness are preserved while achieving blue light filtering functionality.

Inventive Principle:

Principle #26Copying

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

The solution provides effective blue light filtering while maintaining a colorless and transparent appearance, enhancing consumer acceptance by eliminating the yellowish tint associated with traditional blue light filtering lenses.

Implementation Method 1

the blue light filtering compound... block the blue light from reaching the user's eyes directly

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

mixing a blue light filtering compound and a base material to obtain a mixture solution... apply a copolymerization of the mixture solution in the mold to obtain the blue light filtering ophthalmic lens

Methodology Applied

Scientific EffectCopolymerization: Chemical Bonding

Data Source

PatentUS20230204983A1Blue light filtering ophthalmic lens cross-reference to related applications

Publication Date: 2023.06.29 YUNG SHENG OPTICAL

AI summary

This disclosure provides a blue light filtering ophthalmic lens, which is provided with db* value smaller than or equaled to 2. The ophthalmic lens includes a blue light filtering compound and a base material, wherein db*=(b*)1−(b*)0, (b*)1 is a b* value of the ophthalmic lens and (b*)0 is a b* value of a control group lens.