Customized Myopia Control Contact Lens Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for contact lenses aimed at preventing myopia progression do not adequately address individual wavefront/refractive power characteristics, pupil size changes associated with close work, and the difference between far and near stimulus wavefront measurements, leading to incomplete solutions for slowing or stopping myopia progression.
Innovation Solution
The method involves collecting ocular wavefront data for both distance and near stimulus levels, converting it into refractive power maps, and designing contact lenses with power profiles that account for the differences between distance and near wavefronts, using Zernike polynomial coefficients and pupil size data to create customized, rotationally symmetric or non-rotationally symmetric designs that neutralize or shift the natural negative power shift in near wavefronts to match distance wavefronts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional contact lens designs are used, then manufacturing is simple, but they fail to account for individual wavefront characteristics and pupil size changes, resulting in incomplete myopia control
Solution Approach 1:
The patent applies local quality by creating customized contact lens designs tailored to individual wavefront characteristics and pupil size changes. Each lens is designed with specific power profiles that address the unique optical properties of the wearer's eye, particularly focusing on the central optical zone where the pupil is smallest during near tasks. This personalized approach improves myopia control effectiveness while managing complexity through systematic design methodologies.
Solution Approach 2:
The patent utilizes parameter changes by measuring and incorporating specific optical parameters such as wavefront aberrations, refractive power distributions, and pupil size dynamics into the lens design. By adjusting these parameters based on individual measurements, the lens optimizes myopia control performance. The design process involves calculating power profiles that compensate for natural negative power shifts in near wavefronts, thereby addressing the contradiction between effectiveness and complexity.
2Measurement precision
If wavefront data for both distance and near stimulus levels is collected and processed, then personalized lens design accuracy improves, but measurement and processing time increases
Solution Approach 1:
The patent applies preliminary action by conducting comprehensive wavefront measurements for both distance and near stimulus levels during the initial lens design phase. By collecting and processing all necessary optical data beforehand, the system creates accurate personalized lens designs that account for pupil size changes and wavefront characteristics across different viewing conditions. This upfront investment in measurement precision eliminates the need for subsequent adjustments and ensures optimal myopia control from the first use.
3Reliability
If contact lenses are designed to neutralize natural negative power shift in near wavefronts, then myopia progression is slowed, but the lens design becomes more complex requiring advanced manufacturing
Solution Approach 1:
The patent applies segmentation by dividing the contact lens into distinct optical zones with different power profiles. The central optical zone is designed to address near vision and myopia control by neutralizing negative power shifts, while peripheral zones maintain distance vision correction. This segmented approach allows the complex myopia control function to be implemented in a structured manner that is more amenable to manufacturing processes, as each zone can be fabricated with specific parameters rather than requiring the entire lens surface to be highly complex.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Lenses are designed using wavefront measurements amenable to correction factors for near and far vision as well as pupil size to slow or stop myopia progression.