Multi-tint Ophthalmic Lens Chromatic Aberration Myopia Control
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Solution Overview
Problem
Current treatments for progressive myopia focus primarily on central vision correction, which are complex to implement and often disrupt coaxiality when the eye moves, leading to ineffective slowing of myopia progression and blurred vision.
Innovation Solution
A multicolored ophthalmic lens with a central yellow zone and concentric annular zones of decreasing wavelengths, selectively filtering light to reduce peripheral defocusing, allowing only specific wavelengths to focus on the retina, thereby minimizing the affected area and maintaining clear vision during eye movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If differential peripheral correction is implemented to slow myopia progression, then myopia progression is slowed, but device complexity increases and coaxiality alignment becomes difficult to maintain
Solution Approach 1:
The patent applies chromatic aberration by creating concentric zones with different optical powers that correspond to different wavelengths of light. The central zone has one optical power while peripheral zones have different optical powers, causing different wavelengths to focus at different depths. This allows peripheral defocusing to slow myopia progression while maintaining central vision clarity, without requiring complex differential correction schemes.
Solution Approach 2:
The patent changes the optical power parameter across different zones of the lens. The central zone maintains a specific optical power for clear central vision, while peripheral zones have reduced optical power to create defocusing effect. This parameter variation across zones enables the lens to simultaneously achieve clear central vision and peripheral defocusing for myopia control.
2Manufacturing precision
If spectral filtering is used to reduce peripheral defocusing zone, then peripheral focusing is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses chromatic aberration inherent in optical materials to create wavelength-dependent focusing without requiring additional filtering layers or complex manufacturing processes. By designing concentric zones with different optical powers, the lens naturally separates wavelengths spatially, with shorter wavelengths (blue) focusing in front of the retina in peripheral zones while longer wavelengths (red) focus behind the retina. This approach achieves spectral filtering effects through simple geometric zone design rather than complex manufacturing.
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 lens effectively slows down myopia progression by reducing the peripheral retina's affected zone without causing blurred vision when the eye moves, ensuring clear central vision and adjusted peripheral focusing.
Implementation Method 1
the applicant has taken advantage of the well-known phenomenon of chromatic aberration. Chromatic aberration is the variation of the refractive index of the material making up a lens as a function of the wavelength of the light which passes through it.
Data Source
AI summary
The present invention relates to an ophthalmic lens, having, on its surface, a colorless or yellow, central first zone and at least one peripheral second zone, selectively transmitting visible light having a wavelength of less than 570 nm.