Ophthalmic Lens Filter for Motion Sensitivity
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Solution Overview
Problem
Sunglasses filters decrease dynamic contrast sensitivity and motion perception, which is problematic for activities requiring high motion sensitivity without compromising light comfort and protection.
Innovation Solution
A method to determine a filter for visual equipment by subjecting the wearer to various visible light spectra, measuring dynamic contrast sensitivity, and selecting a spectrum that improves motion perception, involving pupil diameter measurement and cone activity gain calculation to design a filter that increases retinal illumination and reduces short wavelength transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter (sunglasses) is used to protect the eye from light, then light protection and comfort are improved, but dynamic contrast sensitivity and motion perception deteriorate
Solution Approach 1:
The patent changes the spectral parameters of the filter by selectively transmitting specific wavelength ranges (480-530nm and 560-650nm) while blocking others. This spectral parameter modification allows the filter to protect against harmful light while maintaining transmission of wavelengths that stimulate M and L cones for motion perception
Solution Approach 2:
The filter applies different transmission properties to different wavelength regions. By creating local quality variations across the spectrum (high transmission in specific bands, low transmission in others), the filter achieves both protection and motion sensitivity enhancement simultaneously
2Object-affected harmful factors
If a filter decreases the number of photons entering the eye, then light protection is improved, but retinal illumination and motion perception deteriorate
Solution Approach 1:
The filter modifies the spectral composition parameters of incoming light rather than uniformly reducing intensity. By changing which wavelengths are transmitted, the filter maintains adequate retinal illumination in critical bands while providing protection in other bands
Solution Approach 2:
The filter selectively transmits specific color ranges (cyan 480-530nm and orange-red 560-650nm) while blocking other colors. This color-selective transmission preserves retinal illumination for motion perception while providing spectral protection
3Illumination intensity
If short wavelength light is transmitted to increase retinal illumination, then motion perception is improved, but pupil constriction increases reducing comfort
Solution Approach 1:
The filter changes the spectral parameters by blocking short wavelengths (400-480nm) that cause strong pupil constriction via ipRGC stimulation, while transmitting medium wavelengths (480-530nm) that provide retinal illumination for motion perception with less pupil impact
Solution Approach 2:
The filter acts as an intermediary that selectively mediates between different wavelength components. It blocks the harmful short wavelengths that cause excessive pupil constriction while allowing beneficial medium wavelengths to pass through for motion perception
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 method enhances motion perception and dynamic contrast sensitivity by increasing retinal illumination, thereby improving reaction time and comfort in activities requiring high motion sensitivity without reducing light comfort.
Implementation Method 1
selecting at least one light spectrum based on the values improving the dynamic contrast sensitivity; and determining the filter based on the at least one selected light spectrum
Data Source
AI summary
The invention concerns a method for determining a filter for a visual equipment intended to be placed in front of the eye of a wearer, the filter being able to improve motion sensitivity of the wearer, the method including the following steps: i. subjecting the wearer to a plurality of visible light spectra having different levels of light intensity within the range of wavelengths from 400 to 600 nm; ii. determining a value representative of a dynamic contrast sensitivity of the wearer for each of the plurality of light spectra; iii. selecting at least one light spectrum based on the values improving the dynamic contrast sensitivity; and iv. determining the filter based on the at least one selected light spectrum.