Diffractive Contact Lens Optical Filtering for Chromatic Aberration
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Solution Overview
Problem
Diffractive optical elements in contact lenses cause significant chromatic aberration due to varying focal power with different wavelengths, leading to blurred halos around images.
Innovation Solution
Incorporating an optical filter that blocks wavelengths of 450 nm to 495 nm and a diffractive optical element designed to focus visible light above 495 nm, reducing the range of wavelengths that can cause chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diffractive optical element is used to focus visible light, then light focusing capability is improved, but chromatic aberration increases causing blurred halos
Solution Approach 1:
The patent extracts and removes the harmful blue light wavelengths (450-495 nm) from the visible spectrum using an optical filter before the light reaches the diffractive optical element. This eliminates the wavelength range that causes chromatic aberration while preserving the beneficial light focusing capability of the diffractive element for the remaining wavelengths (496-750 nm).
Solution Approach 2:
The patent introduces an optical filter as an intermediary component between the light source and the diffractive optical element. This filter acts as a mediator that selectively transmits certain wavelengths (496-750 nm) while blocking harmful wavelengths (450-495 nm), thereby enabling the diffractive element to focus light without producing chromatic aberration.
2Use of energy by moving object
If the full visible spectrum is allowed to pass through, then light transmission is maximized, but image quality deteriorates due to polychromatic blurred halos
Solution Approach 1:
The patent extracts and removes the harmful blue light wavelengths (450-495 nm) from the visible spectrum using an optical filter before the light reaches the diffractive optical element. This eliminates the wavelength range that causes chromatic aberration while preserving the beneficial light focusing capability of the diffractive element for the remaining wavelengths (496-750 nm).
Solution Approach 2:
The patent converts the potentially harmful effect of blue light (which causes chromatic aberration) into a benefit by selectively filtering it out. The optical filter transforms the full-spectrum light into a beneficial narrow-band spectrum (496-750 nm) that enables clear vision without blurred halos, turning a problematic wavelength range into an excluded element.
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
Reduces chromatic aberration, providing clearer and crisper images by limiting the spectrum of light that can pass through the lens, thus improving visual clarity.
Implementation Method 1
Diffractive optical elements interact with light by diffracting it at the interface between two or more materials each having a different refractive index from each other
Implementation Method 2
the optical filter is configured to filter out light with a wavelength of 450 nm to 495 nm
Data Source
AI summary
The present disclosure relates to a contact lens (100) including a diffractive optical element (101), an optical filter (103), and an optic axis (109) passing through the optical filter and the diffractive optical element. The diffractive optical element (101) is configured to focus visible light. The optical filter (103) is configured to filter out light with a wavelength of 450 nm to 495 nm. The optical filter (103) may allow through light with a wavelength of 500 nm to 750 nm. The optical filter (103) may include one or more colorants. The present disclosure also relates to a method (600) of manufacturing a contact lens. The present disclosure also relates to a method (700) of correcting the vision of a user.