Myopia Control Lenses Using Ortho-K Wavefront Subtraction
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Solution Overview
Problem
Current methods for preventing myopia progression, such as those using on-axis longitudinal spherical aberration and field curvature, do not effectively address individual wavefront/refractive power characteristics and pupil size changes associated with close work, leading to a need for a more comprehensive approach.
Innovation Solution
The development of ophthalmic lenses that incorporate corneal topographic and wavefront data to design lenses with specific power profiles, including convex surfaces with central optic zones and annuli, which subtract the optical power of the eye after orthokeratology treatment to control myopia progression, using methods that involve acquiring and processing data before and after treatment to generate lens power profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional myopia control methods using on-axis longitudinal spherical aberration are used, then some myopia progression control is achieved, but the method does not address individual wavefront characteristics and pupil size changes
Solution Approach 1:
The patent applies local quality by creating customized contact lens wavefront corrections tailored to each individual's specific wavefront aberration profile and pupil size characteristics. Rather than using a uniform approach, the lens design incorporates location-specific optical corrections that match the patient's unique ocular properties, thereby resolving the contradiction between achieving reliable myopia control and adapting to individual variations.
Solution Approach 2:
The patent utilizes parameter changes by measuring and correcting specific wavefront aberration parameters (Zernike coefficients) and adjusting lens design parameters based on pupil size measurements. The lens power and wavefront correction parameters are customized according to individual measurements, enabling the system to adapt to different patients while maintaining effective myopia control through scientifically determined optical parameters.
2Reliability
If customized wavefront correction contact lenses are used, then individual eye characteristics are addressed, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies preliminary action by conducting comprehensive wavefront aberration measurements and pupil size assessments before lens fabrication. All necessary patient-specific parameters are measured and stored in advance, allowing the customized lenses to be manufactured with precise wavefront corrections based on pre-determined specifications. This preliminary data collection simplifies the manufacturing process by eliminating the need for complex real-time adjustments.
Solution Approach 2:
The patent uses copying by creating a digital replica of the patient's wavefront aberration profile through measurements, then using this digital copy to guide lens design and manufacturing. The measured wavefront data is stored and reused to produce lenses that replicate the desired optical correction, simplifying manufacturing by replacing complex custom fabrication with reproduction of predetermined optical patterns.
3Reliability
If orthokeratology treatment is used to flatten cornea, then myopia correction is achieved, but the corneal shape changes affecting optical power distribution
Solution Approach 1:
The patent applies dynamics by designing contact lenses that adapt to the dynamic changes in corneal shape resulting from orthokeratology treatment. The wavefront correction parameters are measured and updated to reflect the new corneal geometry, allowing the lens design to dynamically adjust to the altered optical system. This enables effective myopia control despite the permanent corneal reshaping caused by ortho-k.
Solution Approach 2:
The patent uses feedback by measuring wavefront aberrations both before and after orthokeratology treatment, then using the difference (change in wavefront) to design the contact lens correction. This feedback loop ensures that the lens compensates for the specific optical changes induced by ortho-k, maintaining effective myopia control while accounting for the altered corneal shape and power distribution.
Data Source
AI summary
Lenses are designed using the corneal topography or wavefront measurements of the eye derived by subtracting the optical power of the eye after orthokeratology treatment from the optical power before orthokeratology treatment.