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2. Solar viewer - Wikipedia

   en.wikipedia.org/wiki/Solar_viewer

   The recommended optical density of this eyewear is 5, meaning that the solar viewing filter only permits 1 part in 100,000 of incident light to pass through. In addition to blocking visible light, solar viewers also block ultraviolet and infrared rays which can damage one's eyes.

3. Wood's glass - Wikipedia

   en.wikipedia.org/wiki/Wood's_glass

   Wood's glass was developed as a light filter used in communications during World War I. [2] [3] The glass filter worked both in infrared daylight communication and ultraviolet night communications by removing the visible components of a light beam, leaving only the "invisible radiation" as a signal beam.

4. Here’s what can happen when you view an eclipse incorrectly ...

   www.aol.com/news/protect-eyes-during-annular...

   The lenses of solar eclipse glasses are made of black polymer, or resin infused with carbon particles, that blocks nearly all visible, infrared and ultraviolet light, according to The Planetary ...

5. Optical filter - Wikipedia

   en.wikipedia.org/wiki/Optical_filter

   An ultraviolet-blocking filter renders images closer to the visual appearance of the scene. As with infrared filters there is a potential ambiguity between UV-blocking and UV-passing filters; the latter are much less common, and more usually known explicitly as UV pass filters and UV bandpass filters. [4]

6. 15 Chic Dark Sunglasses That Actually Block Out the Sun - AOL

   www.aol.com/entertainment/15-chic-dark...

   And with summer in full force, you’re going to need those glasses to keep the sun out of your eyes. 21 Flattering Sunglasses That Scream 'I Belong to the Country Club' Before you buy your next ...

7. Smart glass - Wikipedia

   en.wikipedia.org/wiki/Smart_glass

   When installed in the envelope of buildings, smart glass helps to create climate adaptive building shells, [3] which benefits include things such as natural light adjustment, visual comfort, UV and infrared blocking, reduced energy use, thermal comfort, resistance to extreme weather conditions, and privacy. [4]