Multifocal Contact Lens with Varying Diopters for Myopia Control

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Solution Overview

Problem

The prevalence of myopia, especially in children, is high due to increased screen time and improper eye stimulation, leading to potential long-term complications such as high myopia, retinal detachment, and glaucoma. Current methods for correcting pseudomyopia, such as orthokeratology and long-acting mydriatics, can be uncomfortable or have side effects.

Innovation Solution

A contact lens product featuring a multifocal contact lens made of silicone hydrogel or hydrogel, immersed in a buffer solution with a cycloplegic agent. The multifocal contact lens has a central region and annular regions with varying diopters, designed to moderate the increase in axial eye length and prevent myopia progression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If orthokeratology is used to correct pseudomyopia, then correction effectiveness is improved, but wearer comfort deteriorates due to high external pressure

Engineering Contradiction:

Improvecorrection effectivenessVSAvoidwearer comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the optical parameters of the contact lens by incorporating multiple focal points with different diopter values in specific zones. The central distance vision zone has one diopter value while the intermediate vision zone has a different diopter value, creating a multifocal effect that relaxes ciliary muscle tension without requiring high external pressure, thus maintaining both correction effectiveness and wearer comfort

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The contact lens uses a composite design combining silicone and hydrogel materials, leveraging the oxygen permeability of silicone and the comfort properties of hydrogel. This composite material structure allows the lens to maintain effectiveness in correcting pseudomyopia while enhancing wearer comfort through improved oxygen transmission and softness

Inventive Principle:

Principle #40Composite materials

2Reliability

If long-acting mydriatics are applied to correct pseudomyopia, then correction effectiveness is improved, but side effects increase due to higher concentration doses required

Engineering Contradiction:

Improvecorrection effectivenessVSAvoiddrug side effects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the chemical mechanism of long-acting mydriatics with a mechanical/optical mechanism through multifocal contact lens design. The lens uses physical refraction through multiple focal zones to relax ciliary muscle tension, eliminating the need for chemical agents and their associated side effects while maintaining correction effectiveness

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The contact lens acts as an intermediary device between the external environment and the eye's optical system. It introduces intermediate focal points that gradually relax ciliary muscle tension through optical intervention rather than direct chemical action, providing a safer alternative with fewer side effects

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If early-onset myopia is not controlled, then progression to high myopia increases, but intervention methods available are limited and have drawbacks

Engineering Contradiction:

Improvemyopia prevention effectivenessVSAvoidintervention method complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The contact lens divides the visual field into segmented zones with different optical properties: a central distance vision zone, an intermediate vision zone with different diopter characteristics, and a peripheral near vision zone. This segmentation allows the lens to address multiple vision requirements simultaneously while effectively controlling myopia progression through the intermediate zone's optical effect

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The multifocal contact lens performs multiple functions simultaneously: it corrects distance vision, provides intermediate vision support, and controls myopia progression through the intermediate vision zone's optical effect. This multi-functionality reduces the need for separate intervention methods and simplifies the overall management of early-onset myopia

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12298602B2Multifocal contact lens and contact lens product

Publication Date: 2025.05.13 LARGAN MEDICAL CO LTD

AI summary

A contact lens product includes a multifocal contact lens and a buffer solution. The multifocal contact lens is immersed in the buffer solution. The multifocal contact lens includes a central region and at least one annular region. The annular region concentrically surrounds the central region, and a diopter of the annular region is different from a diopter of the central region. The multifocal contact lens is made of silicone hydrogel or hydrogel. The annular region closest to a periphery of the multifocal contact lens is a first annular region.