Color-Dyed Spectacle Lens for Contrast Sensitivity Tuning
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Solution Overview
Problem
Existing spectacle lenses do not effectively enhance contrast sensitivity for wearers, particularly in specific wavelength ranges, and there is a need for improved optical characteristics to address this issue.
Innovation Solution
The development of a spectacle lens with a colorant-dyed lens base that maintains specific transmittance differences and ranges across various wavelengths, including a difference in luminous and average transmittance between the lens base and the colorant-dyed lens base, with optimized transmittance values at 400 nm, 415 to 440 nm, 450 to 500 nm, 530 to 570 nm, and 600 to 650 nm, and the inclusion of functional layers such as a primer, hard coat, and antireflection layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spectacle lens is dyed with a colorant to improve contrast sensitivity, then the transmittance in specific wavelength ranges is improved, but the overall luminous transmittance decreases
Solution Approach 1:
The patent applies local quality by selectively filtering specific wavelength ranges (400 nm and 415-440 nm) while maintaining high transmittance in other visible ranges. The colorant is formulated to create specific transmittance differences in targeted wavelength regions without uniformly reducing overall light transmission, thereby improving contrast sensitivity while preserving adequate luminous transmittance.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the transmittance values at specific wavelengths (400 nm ≤ 2.0%, 415-440 nm: 40.0-80.0%) while maintaining overall luminous transmittance within acceptable ranges (86.0-97.0%). This selective parameter optimization allows the lens to enhance contrast sensitivity in critical wavelength regions without excessively reducing overall light transmission.
2Object-affected harmful factors
If the transmittance at 400 nm is reduced to improve contrast sensitivity, then the harmful blue light transmission is reduced, but the transmittance in adjacent wavelength ranges must be carefully controlled
Solution Approach 1:
The patent applies parameter changes by establishing specific transmittance thresholds at critical wavelengths (400 nm ≤ 2.0%, 415-440 nm: 40.0-80.0%) while maintaining overall luminous transmittance within acceptable ranges (86.0-97.0%). This selective parameter optimization allows the lens to enhance contrast sensitivity in critical wavelength regions without excessively reducing overall light transmission.
Solution Approach 2:
The patent applies local quality by selectively filtering specific wavelength ranges (400 nm and 415-440 nm) while maintaining high transmittance in other visible ranges. The colorant is formulated to create specific transmittance differences in targeted wavelength regions without uniformly reducing overall light transmission, thereby improving contrast sensitivity while preserving adequate luminous transmittance.
3Reliability
If the average transmittance in wavelength range 530 to 570 nm is reduced to improve contrast sensitivity, then the green light filtering is improved, but the difference in transmittance must be precisely controlled
Solution Approach 1:
The patent employs parameter changes by precisely controlling the transmittance values at specific wavelengths (400 nm ≤ 2.0%, 415-440 nm: 40.0-80.0%) while maintaining overall luminous transmittance within acceptable ranges (86.0-97.0%). This selective parameter optimization allows the lens to enhance contrast sensitivity in critical wavelength regions without excessively reducing overall light transmission.
Solution Approach 2:
The patent applies local quality by selectively filtering specific wavelength ranges (400 nm and 415-440 nm) while maintaining high transmittance in other visible ranges. The colorant is formulated to create specific transmittance differences in targeted wavelength regions without uniformly reducing overall light transmission, thereby improving contrast sensitivity while preserving adequate luminous transmittance.
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 optimized spectacle lens improves contrast sensitivity by maintaining desired transmittance levels across critical wavelength ranges, enhancing visual acuity and comfort for wearers.
Implementation Method 1
a transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, and an average transmittance of the spectacle lens in a wavelength range of 415 to 440 nm is 40.0% to 80.0%
Data Source
Figure 1
AI summary
An object of the present disclosure is to provide a spectacle lens capable of improving the contrast sensitivity. The spectacle lens of the present disclosure includes a colorant-dyed lens base obtained by dying a lens base with a colorant. A difference between a luminous transmittance of the lens base and a luminous transmittance of the colorant-dyed lens base is 1.0% to 4.0%, a difference between an average transmittance of the lens base in a wavelength range of 530 to 570 nm and an average transmittance of the colorant-dyed lens base in a wavelength range of 530 to 570 nm is 1.0% to 5.0%, a transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, and an average transmittance of the spectacle lens in a wavelength range of 415 to 440 nm is 40.0% to 80.0%.