Spectacle Lens Defocus Layout for Peripheral Refraction Compensation
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Solution Overview
Problem
Existing spectacle lenses with defocus areas, such as DIMS, cause off-axis hyperopia and off-axis astigmatism due to rays focusing behind the peripheral retina, leading to a decrease in actual defocus power and relative peripheral refraction, which affects myopia progression inhibition.
Innovation Solution
A spectacle lens design that includes a base area and multiple defocus areas, where at least half of these areas have their defocus power and/or size adjusted to compensate for changes in retinal spot size due to relative peripheral refraction, with at least 80% of areas having equal size or power to counteract these effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If defocus areas are formed on the spectacle lens to inhibit myopia progression, then myopia progression is inhibited, but off-axis hyperopia and off-axis astigmatism occur causing a gap between image position and peripheral retina
Solution Approach 1:
The patent applies local quality by differentiating the optical properties across different regions of the lens. The defocus areas are strategically positioned and sized to provide localized defocus effects specifically where needed for myopia inhibition, while the base area maintains clear vision. This regional differentiation allows the lens to simultaneously achieve myopia progression inhibition through defocus areas while minimizing off-axis optical aberrations in the base area.
Solution Approach 2:
The patent employs parameter changes by systematically varying the defocus power, size, and position of multiple defocus areas across the lens surface. By adjusting these parameters differently in various regions, the lens compensates for off-axis hyperopia and astigmatism effects, ensuring that the defocus power remains accurate despite peripheral refraction variations.
2Reliability
If defocus areas are positioned to maximize myopia inhibition, then myopia progression is inhibited, but relative peripheral refraction causes retinal spot size changes reducing effectiveness
Solution Approach 1:
The patent applies dynamics by designing the defocus areas with varying sizes and powers that adapt to different eccentricity angles. Rather than using uniform defocus areas, the lens incorporates a dynamic configuration where defocus area parameters change based on their position relative to the optical axis, allowing the lens to maintain effective defocus power across different viewing directions and compensate for relative peripheral refraction effects.
Solution Approach 2:
The patent introduces dimensional variation by considering the three-dimensional spatial distribution of defocus areas across the lens surface. By varying the size, shape, and power of defocus areas in different spatial dimensions and positions, the lens compensates for eccentricity angle effects and maintains consistent defocus performance across peripheral vision fields.
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 design effectively compensates for changes in retinal spot size, stabilizing the myopia progression inhibitory effect by ensuring the defocus areas adapt to the wearer's eccentricity angle, thereby enhancing myopia inhibition.
Implementation Method 1
a plurality of defocus areas that each contact the base area and have a characteristic whereby a beam that passes through at least a portion of the defocus area is incident on the retina as a diverging ray
Data Source
AI summary
A technology for inhibition of myopia progression adapted to the RPR of the wearer is provided. A spectacle lens and related technology are provided that include a base area that causes a beam that enters through an object-side surface to exit through an eye-side surface and converge on a retina via the eye, and a plurality of defocus areas that each contact the base area and have a characteristic whereby a beam that passes through at least a portion of the defocus area is incident on the retina as a diverging ray, and, in not less than half of the plurality of defocus areas, at least one of a defocus power and a size of each defocus area is set, so as to compensate for a change in retinal spot size due to relative peripheral refraction (RPR) that depends on an eccentricity angle of the eye of the wearer.