Ophthalmic Lens Power Profile for Myopia Progression Control
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Solution Overview
Problem
Conventional corrective lenses fail to address the dynamic change in focus error over time for progressing myopes, leading to significant visual acuity variation and the need for frequent prescription updates.
Innovation Solution
Designing ophthalmic lenses with power profiles that include spherical, multifocal, freeform, and segmented freeform designs, tailored to an individual's initial paraxial power and myopia progression rate, to minimize visual acuity variation by modulating dioptric power across the lens, including zones with varying powers to maintain consistent neural sharpness over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional corrective lenses with static spherical equivalent power are prescribed, then initial distance vision correction is optimal, but visual acuity deteriorates over time due to myopia progression
Solution Approach 1:
The lens incorporates dynamic power distribution through multifocal zones and progressive addition designs that adapt to changing myopic conditions over time, allowing the lens to maintain effective correction as the eye progresses
Solution Approach 2:
The lens design anticipates future myopia progression by incorporating power profiles that pre-compensate for expected refractive changes, extending the functional life of the prescription before requiring updates
2Ease of manufacture
If conventional single-power lenses are used, then manufacturing is simple and cost-effective, but visual acuity variation occurs over time
Solution Approach 1:
The lens is divided into multiple zones with different optical powers (distance zone, intermediate zone, near zone) that work together to provide consistent visual acuity across different viewing distances and accommodate myopia progression
Solution Approach 2:
Different regions of the lens are assigned different dioptric powers and optical characteristics tailored to specific viewing requirements, with the peripheral zones providing myopia control while the central zones maintain clear distance vision
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 customized lens designs effectively minimize visual acuity variation and prolong the period before a new prescription is needed, ensuring consistent distance vision correction for progressing myopes by maintaining neural sharpness across the specified time period.
Implementation Method 1
The lens has power profile that may be selected from the group consisting of a power profile with spherical aberration, a multifocal power profile, a freeform power profile, and a segmented freeform power profile
Data Source
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AI summary
Contact lenses incorporate power profiles that minimize visual acuity variation for progressing myopes based upon minimization of the variation of neural sharpness image quality over a specific time period. The contact lens includes a center and at least one peripheral zone surrounding the center and having a different dioptric power than at the center. The lens has power profile selected from the group consisting of a power profile with spherical aberration, a multifocal power profile, a freeform power profile, and a segmented freeform power profile. The power profile is based on an initial paraxial power of a myopia progressor and a defined myopia progression rate over a specific time period, resulting in controlled change of the neural sharpness, thereby minimizing changes in changes in visual acuity at a beginning of the time period and at an end of the time period.