Ophthalmic Article Polarizer with Reduced Efficiency for Contrast
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Solution Overview
Problem
Existing ophthalmic articles, such as polarized sunglasses, suffer from reduced contrast and increased visual fatigue due to high glare reduction, leading to potential safety hazards, especially in rapidly changing light conditions.
Innovation Solution
An ophthalmic article with a polarizer having lower polarization efficiency and higher luminous transmittance than standard polarizers, combined with a colored substrate that enhances contrast and includes photochromic properties, allowing for improved light intensity adjustment and glare protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If standard polarizers with high polarization efficiency are used, then glare protection is improved, but contrast is reduced and visual fatigue increases
Solution Approach 1:
The patent applies parameter changes by using a polarizer with modified optical parameters - specifically, a polarizer with lower polarization efficiency (80-85% instead of higher values) and higher luminous transmittance (41-48% instead of lower values). This parameter optimization resolves the contradiction by maintaining sufficient glare protection while preserving contrast and reducing visual fatigue.
2Reliability
If high polarization efficiency is used to reduce glare, then safety is improved, but visual comfort deteriorates due to visual fatigue
Solution Approach 1:
The patent changes the optical parameters of the polarizer to achieve a balance between safety and comfort. By selecting a polarizer with luminous transmittance of 41-48% and polarization efficiency of 80-85%, the invention maintains safety through adequate glare reduction while improving visual comfort by reducing visual fatigue associated with higher polarization efficiency materials.
3Object-affected harmful factors
If standard polarizers with low luminous transmittance are used, then glare protection is enhanced, but light intensity adjustment capability is reduced
Solution Approach 1:
The patent applies parameter changes by selecting a polarizer with higher luminous transmittance (41-48%) compared to standard polarizers. This enables better adaptability to varying light conditions while maintaining effective glare protection, allowing the ophthalmic article to adjust to different lighting environments more effectively.
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 solution provides enhanced contrast and comfort by reducing visual fatigue, enabling better vision in varying light conditions, such as when entering a tunnel on a sunny day, while maintaining safety and glare protection.
Implementation Method 1
polarized lenses and visors are widely used for glare reducing ophthalmic articles
Implementation Method 2
The colored substrate can be obtained by bulk tinting of the substrate with a photochromic mixture
Data Source
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AI summary
The invention relates to an ophthalmic article (1) comprising: - at least one colored substrate (9) and - a polarizer (11) fixed to that at least one colored substrate (9), wherein the polarizer (11) presents on its own a luminous transmittance according to ISO_13666, First edition, 1998-08-01 of Tv ≥ 41 % and a polarization efficiency PE with 90% ≥ PE ≥ 78%.