Ophthalmology

Solar eclipse: Glasses are key says ophthalmologist

Nicole Bajic was completing her medical residency at the University of Chicago when she briefly ducked out between surgery training classes to watch the 2017 solar eclipse darken the skies. At the time, she didn't fully appreciate ...

Infrared

Infrared (IR) radiation is electromagnetic radiation whose wavelength is longer than that of visible light (400-700 nm), but shorter than that of terahertz radiation (100 µm - 1 mm) and microwaves (~30,000 µm). Infrared radiation spans roughly three orders of magnitude (750 nm and 100 µm).

Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux, which includes infrared (47% share of the spectrum), visible (46%), and ultra-violet (only 6%) light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.

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