HEV-Filtering Contact Lens Composition for Glare and Photostress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current contact lens standards do not adequately protect the eye from high energy visible (HEV) light, which can cause visual discomfort, eye strain, and disrupt the circadian rhythm, while existing materials that absorb HEV light may negatively affect vision by blocking essential visible light.
Innovation Solution
Contact lenses made from a reactive mixture of polymerizable compounds and HEV light absorbing compounds that filter HEV light, allowing for targeted absorption and transmission of light across specific wavelength ranges to improve vision attributes such as photostress recovery time, glare discomfort, and light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HEV light absorbing compounds are used to filter high energy visible light, then protection from visual discomfort and circadian rhythm disruption is improved, but transmission of essential visible light may be reduced
Solution Approach 1:
The contact lens incorporates HEV light absorbing compounds that selectively absorb only the high energy visible light portion of the spectrum (approximately 400-450 nm) while allowing other visible wavelengths to pass through. This localized absorption approach protects against harmful HEV radiation without compromising overall visual clarity and color perception.
Solution Approach 2:
The patent utilizes compounds with specific absorption characteristics that target the HEV wavelength range. By selecting compounds with appropriate absorption spectra and adjusting their concentration, the lens achieves optimal balance between HEV filtration and visible light transmission, maintaining visual quality while providing protection.
2Object-affected harmful factors
If UV radiation absorption is increased to protect the cornea, then corneal protection is improved, but transmission of beneficial wavelengths may be reduced
Solution Approach 1:
The contact lens provides segmented protection by addressing different harmful radiation ranges separately: UV protection for wavelengths below 400 nm and HEV filtration for wavelengths 400-450 nm. Each protective function is optimized independently, allowing maximum transmission of beneficial visible light above 450 nm while maintaining protection against both UV and HEV radiation.
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 provide significant improvements in vision attributes like photostress recovery time, glare discomfort, and light scattering by selectively filtering HEV light, maintaining visual clarity and comfort.
Implementation Method 1
The contact lens may transmit from 0 percent to 70 percent, or from 1 percent to 70 percent, of light across a wavelength range of 400 to 409 nm
Data Source
AI summary
Described are contact lenses that contain high energy visible (HEV) light absorbing compounds and their use for improving one or more vision attributes.