Multifocal Lens Design for Myopia Progression Control

Solution Overview

Problem

Conventional corrective lenses for myopia do not address the underlying cause of the condition and fail to slow or retard myopia progression, as they do not adequately mitigate the impact of hyperopic blur on retinal image quality, which contributes to eye growth and refractive errors.

Innovation Solution

A multifocal ophthalmic lens design with a stepped or discontinuous power profile, providing foveal vision correction and an increased depth of focus with reduced image quality sensitivity, which desensitizes the retina to hyperopic defocus, thereby slowing or preventing myopia progression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional corrective lenses are used to shift focus to the retinal plane, then myopic defocus error is corrected, but myopia progression is not slowed or retarded

Engineering Contradiction:

Improvefocus accuracyVSAvoidmyopia progression control

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The lens is divided into multiple zones with different optical powers: a central distance vision zone and one or more peripheral near vision zones. This segmentation allows different parts of the lens to perform different functions - the central zone corrects distance vision while the peripheral zones create myopic defocus to slow eye growth, thereby addressing both focus accuracy and myopia progression control simultaneously

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens are assigned different optical properties. The central region provides distance correction while the peripheral regions provide near vision with myopic defocus. This local differentiation allows the lens to simultaneously correct focus errors and prevent myopia progression by creating appropriate defocus in specific retinal regions

Inventive Principle:

Principle #3Local quality

2Measurement precision

If single vision lens design is used for distance correction, then foveal vision is corrected, but depth of focus is insufficient to reduce sensitivity to hyperopic blur

Engineering Contradiction:

Improvefoveal vision correctionVSAvoiddepth of focus

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The lens is divided into multiple zones with different optical powers: a central distance vision zone and one or more peripheral near vision zones. This segmentation allows different parts of the lens to perform different functions - the central zone corrects distance vision while the peripheral zones create myopic defocus to slow eye growth, thereby addressing both focus accuracy and myopia progression control simultaneously

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The multifocal lens performs multiple functions simultaneously: it corrects distance vision through the central zone, provides near vision through the peripheral zones, and creates myopic defocus to slow eye growth. This multi-functionality allows a single lens to address both foveal vision correction and increased depth of focus needs

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10061143B2Multifocal lens design for preventing and/or slowing myopia progression

Publication Date: 2018.08.28 JOHNSON & JOHNSON VISION CARE INC

AI summary

Contact lenses incorporate multifocal power profiles that at least one of slow, retard or preventing myopia progression. The lens includes a first zone at a center of the ophthalmic lens and at least one peripheral zone surrounding the first zone. The at least one peripheral zone has a different width and dioptric power than the first zone. The first zone and at least one peripheral zone are stepped or discontinuous. The multifocal power profile has substantially equivalent foveal vision correction to a single vision lens and has a depth of focus and reduced retinal image quality sensitivity that slows, retards, or prevents myopia progression.