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In the months leading to the solar eclipse of August 21, 2017, counterfeits of light-filtering glasses for solar eclipses began proliferating. Effective eclipse glasses filter visible, ultraviolet, and infrared light. [4] The eye's retina lacks pain receptors, and thus damage could occur without one's awareness. [5] [6]
Separately, you can observe the sun with a telescope, binoculars or camera that has a special solar filter on the front, which acts the same way eclipse glasses would. “You need certified ISO ...
While non-tinted glasses are very rarely worn without the practical purpose of correcting eyesight or protecting one's eyes, sunglasses have become popular for several further reasons, and are sometimes worn even indoors or at night. Sunglasses can be worn to hide one's eyes.
X-ray specs or X-ray glasses are an American novelty item, purported to allow users to see through or into solid objects. In reality, the spectacles merely create an optical illusion; no X-rays are involved. The current paper version is sold under the name "X-Ray Spex"; a similar product is sold under the name "X-Ray Gogs".
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The glasses are controlled by a timing signal that allows the glasses to alternately block one eye, and then the other, in synchronization with the refresh rate of the screen. The timing synchronization to the video equipment may be achieved via a wired signal, or wirelessly by either an infrared or radio frequency (e.g. Bluetooth , DLP link ...
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