Spectacle Lens Defocus Pattern for Stable Retinal Spot Intensity
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Solution Overview
Problem
The visibility of spectacle lenses designed to suppress myopia progression is affected by the area and height of defocus regions, leading to changes in spot intensity at the focal point on the retina due to oblique light incidence and hard coating layer formation.
Innovation Solution
A spectacle lens design that includes a base region and defocus regions, where the area ratio and arrangement of defocus regions are optimized to minimize the impact of sag amount changes on spot intensity, using specific mathematical relationships and arrangements such as hexagonal patterns, to maintain consistent spot intensity across varying wavelengths and angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area and height of defocus regions are increased to improve myopia suppression function, then the myopia progression suppressing function is enhanced, but the spot intensity at the focal point on the retina is reduced, worsening visibility
Solution Approach 1:
The patent applies parameter changes by optimizing the area ratio of defocus regions to base region within the specific range of 5-50%, and controlling the height of defocus regions within 0.1-10μm. These parameter optimizations balance the myopia suppression function with visibility, resolving the contradiction between enhancing myopia suppression and maintaining spot intensity at the focal point.
2Reliability
If the area ratio of defocus regions is increased to enhance myopia suppression, then the myopia progression suppression is improved, but the visibility is reduced due to decreased spot intensity
Solution Approach 1:
The patent optimizes the area ratio parameter of defocus regions to fall within 5-50% of the total lens area, and controls the height parameter within 0.1-10μm. These parameter changes ensure that sufficient light reaches the focal point on the retina for good visibility, while still providing effective myopia suppression through the defocus regions.
3Reliability
If the height of defocus regions is increased to improve wavefront progression, then the myopia suppression function is enhanced, but the spot intensity becomes more sensitive to oblique light incidence and hard coating layers
Solution Approach 1:
The patent controls the height of defocus regions within the range of 0.1-10μm, which is sufficient to create the necessary wavefront progression for myopia suppression while remaining small enough to minimize sensitivity to oblique light incidence and hard coating layer variations. This parameter optimization reduces manufacturing precision requirements while maintaining effectiveness.
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 reduces the sensitivity of spot intensity at the focal point on the base surface to changes in sag amount, ensuring consistent visibility and myopia suppression even with oblique light incidence or hard coating layers.
Implementation Method 1
a spectacle lens including: a base region primarily responsible for causing a light beam that has entered from an object-side surface to exit from an eyeball-side surface to be converged onto a retina through an eyeball; and a plurality of defocus regions in contact with the base region and primarily responsible for causing the light beam to be converged on a front side or a back side of the retina
Data Source
AI summary
Provided are a spectacle lens and a technique associated therewith, wherein, when λ is a wavelength, r is a ratio of a total area of defocus regions to an overall area in plan view of a portion in which a plurality of defocus regions are provided in the spectacle lens, w is an amount of progression of a wavefront in each of the defocus regions relative to a base region, an average value of cos (2πw/λ) in one defocus region is obtained in each of the plurality of defocus regions, c(λ) is a gross average of the plurality of average values, an average value of sin (2πw/λ) in one defocus region is obtained in each of the plurality of defocus regions, s(λ) is a gross average of the plurality of average values, and f(λ) is equal to {1−r+r·c(λ)}2+{s(λ)}2, a sign of {f(λ×1.01)−f(λ)} is inverted at least once when the wavelength λ is increased within a range of 0.45 μm≤λ≤0.65 μm.