Light
Light is made up of electromagnetic particles that travel in waves. Light is grouped into the following categories: gamma rays, x-rays, ultraviolet (UV) rays, visible light, infrared light, and radio waves. The Frequency varies from 300 EHz to 3 Hz.
Visible Light
The visible light is the portion of the electromagnetic spectrum that the human eye can see. Typically, the human eye can detect wavelengths from 380 to 750 nanometers. Our eyes have cone shaped cells which act as receivers tuned to the wavelengths in this small band of the spectrum. Every wavelength of visible light have different colors like red, orange, yellow, green, cyan, blue, and violet.
What is blue light?
Mainly emitted by the sun and part of the visible light spectrum, but also by artificial light sources. Blue light can be divided two sub-sections: Bad blue light and Good blue light
The wave length of bad blue light is (415-455 nm). This is is harmful to the retina and over time causes retinal cell death if there is too much exposure.
The wave length of Good blue light is (465-495 nm). This is essential for our pupillary reflex and for synchronization of our circadian rhythms (is a term to describe your brain's natural sleep-wake schedule), which helps to maintain and regulate memory, mood, and hormonal balance.
Blue light protection spectacle lenses.
A good quality blue light protection spectacle lens have technologies to block bad blue light (415-455 nm) and pass good blue light (465-495 nm).
Research undertaken by world leading scientists have come up with multiple techniques for protecting our eyes from bad blue light which they have incorporated in the new generation spectacle lenses. These can be broadly classified as :
Here think film layers and laid over the lens. Due to this when blue-violet light hit the lens, it’s getting reflected by the lens surface and there by preventing the harmful light from reaching the human eye.
In this method, researchers have applied techniques to absorb the blue-violet light than reflecting it. Lenses manufactured using this technique don’t have the blue reflection and it has more visual clarity. This technique also managed to correct the slight yellow tint and provide more transparent protection.
For more details / clarificatios about blue light protection you can call us on 079757 68550 or email us at info@indusoptics.com
Thanks,
Team Indus