Peripheral Distortion Spectacle Lenses for Refractive Error Control
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Solution Overview
Problem
Existing technologies are inadequate in effectively controlling the progression of myopia and hyperopia, with a high prevalence and correlation to educational activities, and there is a need for innovative lens designs that can regulate refractive errors.
Innovation Solution
Spectacle lenses with customized central and peripheral zones, featuring varying thicknesses or refractive indices, are designed to introduce pincushion or barrel distortion in the peripheral retina to control myopia and hyperopia progression, combined with techniques like rotational stabilization, spherical aberration, and wavelength-specific filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectacle lenses are used for vision correction, then central visual acuity is improved, but peripheral refractive errors (myopia and hyperopia progression) are not effectively controlled
Solution Approach 1:
The spectacle lens is divided into distinct functional zones: a central zone for providing clear central vision and correcting central refractive errors, and a peripheral zone for controlling peripheral refractive errors through induced distortion. This segmentation allows different regions of the lens to perform different functions simultaneously, addressing both central visual acuity and peripheral myopia/hyperopia progression control.
Solution Approach 2:
The lens design implements local quality by providing different optical properties in different regions. The central zone maintains standard optical characteristics for clear vision, while the peripheral zone introduces controlled distortion (pincushion or barrel) to modify peripheral retinal image quality. This local differentiation enables the lens to address specific refractive errors in different retinal regions with appropriate optical characteristics.
2Reliability
If spectacle lenses introduce peripheral distortion to control myopia progression, then peripheral refractive error control is improved, but image distortion and visual discomfort may increase
Solution Approach 1:
The lens applies partial action by introducing distortion only in the peripheral zone while maintaining standard optics in the central zone. The peripheral distortion is applied at controlled levels (pincushion or barrel distortion) specifically in the peripheral regions where it can influence refractive error progression without significantly impacting central vision quality. This partial application minimizes overall image distortion and visual discomfort while achieving the therapeutic effect.
3Adaptability or versatility
If spectacle lenses use varying thickness or refractive index in peripheral zones to induce distortion, then manufacturing complexity increases, but customization for individual eye conditions is improved
Solution Approach 1:
The lens design utilizes parameter changes by varying either the thickness parameter or the refractive index parameter in the peripheral zone to induce the desired distortion effect. These parameter variations are carefully controlled to achieve specific distortion levels (pincushion or barrel) that can be customized for different patient conditions. The use of parameter changes rather than complex structural modifications simplifies the manufacturing process while enabling customization.
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 lenses effectively regulate refractive errors by introducing targeted distortions and defocus, reducing the progression of myopia and hyperopia, and can be customized for individual eye conditions, providing precise vision correction.
Implementation Method 1
a distance from the second zone to the optical center of the central zone is selected to generate pincushion distortion or barrel distortion in the eye of the patient
Implementation Method 2
the central zone includes a conic-section curve configured to generate a spherical aberration in the eye of the patient
Implementation Method 3
the spectacle lens has a colorant added to the material or surface of the film to alter the spectral transmission of the spectacle lens
Data Source
AI summary
In general, one aspect disclosed features a spectacle lens, comprising: a central zone having an optical center corresponding to the visual axis of an eye of a patient; and a peripheral zone peripheral to the central zone and comprising: a first zone having a first thickness, and a second zone having a second thickness, wherein: the second thickness varies from the first thickness, and a distance from the second zone to the optical center of the central zone is selected to generate pincushion distortion or barrel distortion in the eye of the patient.