Part of the eye

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it’s A 15 letters crossword definition.
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Possible Answers:

LENS.

Last seen on: –The Telegraph – QUICK CROSSWORD NO: 30,018 – Jun 20 2022s
USA Today Crossword – Jan 3 2022
NY Times Crossword 5 Dec 21, Sunday
Newsday.com Crossword – Sep 7 2021
Newsday.com Crossword – Nov 4 2020
Newsday.com Crossword – Sep 21 2020
NY Times Crossword 31 Aug 20, Monday
NY Times Crossword 13 Aug 20, Thursday
Newsday.com Crossword – Apr 28 2020
Newsday.com Crossword – Mar 29 2020
Newsday.com Crossword – Feb 19 2020
NY Times Crossword 4 Oct 19, Friday
NY Times Crossword 21 Jun 19, Friday

Random information on the term “LENS”:

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.

The word lens comes from lēns , the Latin name of the lentil, because a double-convex lens is lentil-shaped. The lentil plant also gives its name to a geometric figure.

Some scholars argue that the archeological evidence indicates that there was widespread use of lenses in antiquity, spanning several millennia. The so-called Nimrud lens is a rock crystal artifact dated to the 7th century BC which may or may not have been used as a magnifying glass, or a burning glass. Others have suggested that certain Egyptian hieroglyphs depict “simple glass meniscal lenses”.[verification needed]

LENS on Wikipedia