Freeform Ophthalmic Lens Design for Myopia Control
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Solution Overview
Problem
Conventional corrective lenses do not effectively address the progression of myopia, as they only correct the symptoms by altering the eye's focus without influencing the underlying cause, and they fail to reduce the sensitivity of the retinal image to hyperopic blur, which contributes to myopia progression during near work activities.
Innovation Solution
The development of ophthalmic lenses with a free form power profile that provides foveal vision correction and an increased depth of focus, reducing image quality sensitivity to hyperopic blur, thereby slowing or preventing myopia progression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional corrective lenses are used to correct myopia, then visual acuity is improved, but myopia progression is not slowed or prevented
Solution Approach 1:
The lens is divided into multiple zones with different optical powers: a central zone for distance vision correction and peripheral zones for near work correction. This segmentation allows the lens to simultaneously address both distance vision quality and near work accommodation, thereby controlling myopia progression while maintaining visual acuity.
Solution Approach 2:
Different regions of the lens are designed with different optical properties. The central region provides standard myopic correction, while peripheral regions incorporate additional optical zones that create specific defocus patterns. This local differentiation enables the lens to control eye growth in different retinal regions, addressing the root cause of myopia progression.
2Measurement precision
If conventional single vision lenses are used, then distance vision is corrected, but depth of focus is insufficient and retinal image quality is highly sensitive to blur during near work
Solution Approach 1:
The lens design incorporates dynamic optical zones that adapt to different viewing distances. The peripheral zones create variable defocus patterns that change with accommodation state, allowing the lens to maintain appropriate retinal image quality across a range of distances. This dynamic response reduces sensitivity to blur during near work while maintaining distance vision correction.
Solution Approach 2:
The lens adds an additional optical dimension by incorporating peripheral zones with different powers beyond the central zone. This creates a multi-dimensional optical profile that addresses both distance and near vision requirements, increasing depth of focus without sacrificing distance vision correction.
3Measurement precision
If conventional corrective lenses are used, then myopic defocus error is corrected, but image quality sensitivity to hyperopic blur remains high during near work
Solution Approach 1:
The lens converts the potentially harmful hyperopic blur during near work into a beneficial defocus pattern. By designing peripheral zones that create controlled defocus, the lens transforms what would normally be a harmful blur into a useful optical signal that controls eye growth, thereby reducing sensitivity to hyperopic blur while maintaining myopic correction.
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 free form power profile design ensures comparable distance vision correction with reduced image quality sensitivity, making the retinal image less sensitive to hyperopic blur, thus effectively slowing down myopia progression and providing a cost-effective treatment.
Implementation Method 1
The ophthalmic lenses of the present invention comprise free form power profiles that provide foveal vision correction, an increased depth of focus and an optimized retinal image
Data Source
AI summary
Lenses incorporate freeform power profiles that at least one of slow, retard or preventing myopia progression. An ophthalmic lens includes a first zone at a center of the lens; a first peripheral region continuously extending from the center, the first peripheral region having a different dioptric power than at the center; and a second peripheral region continuously extending from the first peripheral region and having a different dioptric power than the first peripheral region, thereby providing a continuous freeform power profile having substantially equivalent visual performance to a single vision lens, and having a depth of focus and reduced retinal image quality sensitivity that slows, retards, or prevents myopia progression.