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Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which in artificial narrowband form has a number of proven negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related ...
Compared to silica glass, fluoride glasses undergo multiphonon scattering at longer wavelengths which is why they stay transparent into the infrared spectrum. This is where multiple phonons are created with the absorption and conjunction of a single phonon. This is important specifically in glass because neighboring ions vibrating against each ...
Sun specs (also sunspecs) is the shortened form of sun spectacles. Sunglass a monocle version. [citation needed] Sun-shades can also refer to the sun-shading eyepiece-type, although the term is not exclusive to these. Also in use is the derivative abbreviation, "shades". Dark glasses (also preceded by pair of) — generic term in common usage.
Infrared cut-off filters, sometimes called IR filters or heat-absorbing filters, are designed to reflect or block near-infrared wavelengths while passing visible light. They are often used in devices with bright incandescent light bulbs (such as slide and overhead projectors ) to prevent unwanted heating.
The solar eclipse of December 26, 2019 seen through a pair of solar eclipse glasses in Jaffna, Sri Lanka. A cat demonstrating a pair of eclipse glasses. Solar viewers (also known as solar viewing glasses or solar eclipse glasses) are special eyewear designed for direct viewing of the Sun. Standard sunglasses are unable to filter out eye ...
Sunglasses don’t block infrared radiation. For safe manufacturers and resellers of eclipse glasses and filters for optical devices, including cameras and smartphones, check out the list curated ...