Multifocal Contact Lens with Annular Diopter Zones for Myopia Control

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Solution Overview

Problem

Current methods for preventing or controlling myopia in children, such as orthokeratology and long-acting mydriatics, often result in discomfort and increased risk of drug side effects, and are not effective in addressing the high prevalence of myopia in young children, which can lead to serious complications like retinal detachment and glaucoma.

Innovation Solution

A multifocal contact lens designed with a central region and annular regions of varying diopters, made of silicone hydrogel or hydrogel, immersed in a buffer solution containing a cycloplegic agent, which provides a multi-focus function to moderate the axial length of the eyeball and relax the ciliary muscle, reducing the risk of myopia progression while minimizing side effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If orthokeratology is used to prevent or control myopia, then myopia progression can be slowed, but the wearer experiences discomfort due to high external pressure

Engineering Contradiction:

Improvemyopia control effectivenessVSAvoidwearer comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The contact lens is divided into multiple zones with different optical powers: a central optical zone for clear vision and a peripheral zone for myopia control. This segmentation allows the lens to provide both corrective function and myopia prevention without requiring high overall pressure on the eye.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the contact lens have different optical properties. The central region provides standard refractive correction while the peripheral region provides additional plus power to create myopic defocus, allowing localized functionality that addresses both vision correction and myopia control.

Inventive Principle:

Principle #3Local quality

2Reliability

If long-acting mydriatics are applied to correct pseudomyopia, then temporary vision correction can be achieved, but drug side effects increase with higher concentration doses

Engineering Contradiction:

Improvepseudomyopia correction effectivenessVSAvoiddrug side effects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the chemical mechanism of mydriatics with an optical mechanism. The multifocal contact lens uses optical design (different power zones) to achieve myopia control and pseudomyopia correction without requiring pharmacological agents, thereby eliminating drug side effects.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The contact lens acts as an intermediary optical device that creates myopic defocus in the peripheral vision to control myopia progression and correct pseudomyopia, replacing the need for chemical intermediaries (drugs) and their associated side effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If early-onset myopia is not controlled, then the degree of myopia increases rapidly with age, but intervention methods currently available have significant drawbacks

Engineering Contradiction:

Improvemyopia progression controlVSAvoiduser comfort and safety

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The multifocal contact lens serves multiple functions simultaneously: it provides refractive correction for clear vision, creates myopic defocus for myopia control, and can be worn comfortably by children without drugs or high pressure. This multi-functionality addresses early-onset myopia control while avoiding the drawbacks of existing methods.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 multifocal contact lens effectively prevents the progression of myopia by moderating the axial length of the eyeball and reducing the risk of high myopia, providing comfort and minimizing drug side effects, thus addressing the high prevalence of myopia in children.

Implementation Method 1

The multifocal contact lens includes a central region and at least one annular region, wherein a diopter of the annular region is different from a diopter of the central region

Methodology Applied

Scientific EffectOptical focusing: Lens

Implementation Method 2

a buffer solution containing a cycloplegic agent, which provides a multi-focus function to moderate the axial length of the eyeball and relax the ciliary muscle

Methodology Applied

Scientific EffectPharmacological relaxation:

Data Source

PatentUS11782294B2Multifocal contact lens and contact lens product

Publication Date: 2023.10.10 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.