Gradient Dyed Spectacle Lens for Elderly Vision
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Middle-aged and elderly individuals experience reduced effectiveness of conventional blue light cutting spectacle lenses due to yellowing of crystalline lenses with age, leading to decreased luminous efficiency, difficulty perceiving white, and loss of red vividness, especially in gloomy environments.
Innovation Solution
A functional dyed lens for spectacles is developed by subtly dyeing a clear plastic lens to reduce average transmittance in specific wavelength regions, with a dyeing density of 2-4% in the 530-570 nm range and 2-3.5% in the 430-470 nm and 630-670 nm ranges, to enhance visibility and perception of red and white in gloomy conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional blue light cutting lenses are used to effectively cut high energy blue light (380-500 nm), then light absorption performance at short wavelengths is improved, but luminous transmittance decreases considerably, causing objects to appear darker and red to lose vividness
Solution Approach 1:
The patent applies local quality by creating a density gradient in the lens where the optical density varies across different regions. The lens has higher dye concentration at the periphery and lower concentration toward the center, allowing different parts of the lens to provide different levels of blue light filtration while maintaining overall visibility and color perception.
Solution Approach 2:
The patent changes the parameter of dye concentration distribution from uniform to gradient-based. By controlling the dyeing process to create a density gradient, the lens achieves optimized blue light absorption at specific wavelengths while maintaining adequate luminous transmittance for natural vision and color perception.
2Adaptability or versatility
If density gradient dyeing is applied to achieve cosmetic effect and eye protection, then aesthetic appearance and blue light filtering are improved, but the lens becomes more complex in manufacturing
Solution Approach 1:
The patent applies self-service by utilizing the natural properties of dye diffusion and the lens material characteristics to achieve the density gradient distribution. The dyeing process leverages self-diffusion mechanisms and material-specific absorption characteristics to create the gradient pattern without requiring complex external control systems or multiple processing steps.
3Illumination intensity
If uniform dyeing is applied to achieve desired color, then cosmetic effect is improved, but blue light absorption performance is reduced compared to gradient dyeing
Solution Approach 1:
The patent applies local quality by creating a density gradient in the lens where the optical density varies across different regions. The lens has higher dye concentration at the periphery and lower concentration toward the center, allowing different parts of the lens to provide different levels of blue light filtration while maintaining overall visibility and color 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 dyed lens allows middle-aged and elderly individuals to see objects brightly and vividly, maintain red vividness, and perceive white surfaces as whiter, improving comfort during tasks like computer use, even in low-light environments.
Implementation Method 1
spectral transmittance characteristics in which a transmittance in a wavelength region of 530 nm to 570 nm is higher than transmittances in wavelength regions of 430 nm to 470 nm and 630 nm to 670 nm
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a functional dyed spectacle lens obtained by dyeing at least one of the surfaces of an undyed plastic lens, characterized in that the density of the color formed by dyeing which is defined as a difference in luminous transmittance between the dyed lens and the plastic lens is 2-4% and the difference in average transmittance in the wavelength range of 530-570 nm between the dyed lens and the plastic lens is 3-5%.