Multifocal Lens Design for Myopia Progression Control
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Solution Overview
Problem
Conventional corrective lenses for myopia do not address the underlying cause of the condition and fail to slow or prevent myopia progression, as they do not adequately mitigate the impact of hyperopic blur on retinal image quality during near work activities, leading to potential progression of myopia and associated eye growth issues.
Innovation Solution
Design of multifocal ophthalmic lenses with specific dioptric power profiles that provide foveal vision correction and increased depth of focus, optimizing retinal image quality across a range of accommodative distances to reduce sensitivity to 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 at distance is improved, but myopia progression is not slowed or prevented
Solution Approach 1:
The lens is divided into multiple zones with different dioptric powers: a central zone with first dioptric power for distance vision and an outer zone with second dioptric power greater than the first zone for near vision. This segmentation allows different regions of the lens to address different visual needs simultaneously, providing both distance correction and near vision support while controlling myopia progression.
Solution Approach 2:
Different zones of the lens are assigned different optical properties and dioptric powers tailored to specific visual requirements. The central zone provides distance correction with optimized retinal image quality, while the outer zone provides near vision correction. This local differentiation of optical quality allows the lens to simultaneously improve visual acuity and control myopia progression by providing appropriate focus at different distances.
2Measurement precision
If single focal point corrective lenses are used, then clear vision at one distance is achieved, but depth of focus is limited and retinal image quality degrades during near work
Solution Approach 1:
The lens is designed to perform multiple functions simultaneously: correcting distance vision, providing near vision correction, increasing depth of focus, and maintaining optimized retinal image quality across a range of accommodative distances. The multifocal power profile enables a single lens to serve multiple visual purposes, making the eye less sensitive to blur during near work activities while preserving clear vision at both distance and near.
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 lenses achieve superior image quality on the retina compared to in front of or behind the retina, reducing the degradation of retinal image quality during near work, effectively mitigating myopia progression by desensitizing the eye to hyperopic defocus.
Implementation Method 1
The at least one first zone and the at least one second zone are configured so that an image quality on the retina of the patient is superior to the image quality both in front of the retina and behind the retina
Data Source
AI summary
A multifocal ophthalmic lens has an optic zone that includes at least one first zone having a dioptric power that satisfies a distance refraction need of a patient; and at least one second zone having a dioptric power that is greater than the dioptric power of the at least first zone. The at least one first zone and the at least one second zone are configured so that 1) an image quality on the retina of the patient is superior to the image quality both in front of the retina and behind the retina, and 2) an image quality in front of the retina of the patient is superior to the image quality behind the retina. The multifocal ophthalmic lens prevents and/or slows myopia progression.