Spectacle Lens Defocus Segmentation for Myopia Control Comfort
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Solution Overview
Problem
Existing spectacle lenses that suppress refractive error progression cause discomfort due to eyeball rotation or aesthetically unsightly light scattering, failing to balance functionality with wearer comfort.
Innovation Solution
A spectacle lens design featuring a clear region with a single focal surface and a defocus region comprising segment regions arranged with specific dimensions and powers, ensuring an area ratio of non-segment regions between 0% and 25%, to converge light beams differently on the retina, reducing refractive error progression without discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spectacle lens uses a defocus effect to suppress refractive error progression, then the progression of myopia or hyperopia is reduced, but the lens exterior appears to flicker white due to light scattering causing wearer discomfort
Solution Approach 1:
The defocus region is divided into multiple segment regions (first, second, third segment regions) with different powers arranged in a specific pattern. This segmentation allows controlled light scattering for defocus effect while reducing unwanted white flicker compared to uniform scattering structures
Solution Approach 2:
Different regions of the lens are assigned different optical properties: the clear region has prescription power for clear vision, while the defocus region contains multiple segment regions with different powers (positive, negative, or zero) to create localized defocus effects. This local differentiation optimizes both refractive error suppression and visual comfort
2Reliability
If a spectacle lens reduces spatial frequency contrast to suppress refractive error progression, then myopia progression is reduced, but the technique does not account for eyeball rotation causing wearer discomfort
Solution Approach 1:
The lens design accommodates dynamic eyeball movement by positioning multiple segment regions within the defocus region that remains effective during eye rotation. The segment regions are arranged to maintain defocus effect across different gaze directions, making the lens adaptive to natural eye movements
Solution Approach 2:
The invention transitions from simple contrast reduction to a multi-dimensional approach by incorporating segment regions with different powers (positive, negative, zero) arranged in specific patterns. This adds optical dimensionality that maintains effectiveness during eyeball rotation while suppressing refractive error progression
3Reliability
If a spectacle lens provides strong defocus effect to suppress myopia progression, then refractive error suppression is enhanced, but the lens may cause visual discomfort or reduce clear vision quality
Solution Approach 1:
The defocus region contains segment regions with different powers (positive, negative, or zero) rather than uniform strong defocus. This partial application of defocus effect across different segments provides sufficient myopia suppression while avoiding excessive defocus that would cause visual discomfort
Solution Approach 2:
The invention varies the power parameter across different segment regions within the defocus region. By using positive, negative, and zero power segments in specific arrangements, the lens optimizes the balance between defocus effect for myopia suppression and visual comfort for the wearer
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 lens provides a comfortable fit while effectively suppressing myopia or hyperopia progression by optimizing light convergence, minimizing light scattering, and maintaining an aesthetically pleasing appearance.
Implementation Method 1
the clear region is configured as a single focal surface to which a prescription power is imparted so that a light beam incident from an object-side surface is emitted from an eyeball-side surface and is converged on a retina
Implementation Method 2
the defocus region has a plurality of segment regions to which a power different from the prescription power is imparted so that the light beam incident from the object-side surface is emitted from the eyeball-side surface and is converged on a position different from on a retina
Data Source
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AI summary
There is provided a spectacle lens that is a spectacle lens 10 including: a clear region 11 located so as to include a lens center; and a defocus region 12 located around the clear region 11, wherein the clear region 11 is configured as a single focal surface to which a prescription power is imparted so that a light beam incident from an object-side surface is emitted from an eyeball-side surface and is converged on a retina of an eyeball of a spectacle wearer; the defocus region 12 has a plurality of segment regions 12a to which a power different from the prescription power is imparted so that the light beam incident from the object-side surface is emitted from the eyeball-side surface and is converged on a position different from on a retina of the eyeball of the spectacle wearer; and an area ratio of non-segment regions to a combined area of the plurality of segment regions 12a and the non-segment regions other than the segment regions 12a in the defocus region 12 is 0% or more and 25% or less.