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Thread: First lenses made...date as early as 700 BC ...........................

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    Blue Jumper First lenses made...date as early as 700 BC ...........................

    A long time ago ..........................

    Optics began with the development of lenses by the ancient Egyptians and Mesopotamians. The earliest known lenses, made from polished crystal, often quartz, date from as early as 700 BC for Assyrian lenses such as the Layard/Nimrud lens.[2]

    The ancient Romans and Greeks filled glass spheres with water to make lenses. These practical developments were followed by the development of theories of light and vision by ancient Greek and Indian philosophers, and the development of geometrical optics in the Greco-Roman world.

    The word optics comes from the ancient Greek word ὀπτική (optikē), meaning "appearance, look".Greek philosophy on optics broke down into two opposing theories on how vision worked, the "intromission theory" and the"emission theory".[4] The intro-mission approach saw vision as coming from objects casting off copies of themselves (called eidola) that were captured by the eye. With many propagators including Democritus, Epicurus, Aristotle and their followers, this theory seems to have some contact with modern theories of what vision really is, but it remained only speculation lacking any experimental foundation.


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    I just made this post so the Kidney extract was not the first in line of the Canadian Forum..
    Chris Ryser
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    Vikings "invented" aspheric high plus power lenses.

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    Blue Jumper Vikings "invented" aspheric high plus power lenses...........................

    Quote Originally Posted by Tallboy View Post

    Vikings "invented" aspheric high plus power lenses.


    above is statement of the year ..........................

    In 984, Ibn Sahl first discovered the law of refraction, usually called Snell's law, which he used to work out the shapes of anaclastic lenses that focus light with no geometric aberrations.

    Early attempts at making aspheric lenses to correct spherical aberration were made by René Descartes in the 1620s, and by Christiaan Huygens in the 1670s; the cross-section of the shape devised by Descartes for this purpose is known as a Cartesian oval. The Visby lenses found in Viking treasures on the island of Gotland dating from the 10th or 11th century are also aspheric, but exhibit a wide variety of image qualities, ranging from similar to modern aspherics in one case to worse than spheric lenses in others. The origin of the lenses is unknown, as is their purpose (they may have been made as jewelry rather than for imaging).
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    Quote Originally Posted by Chris Ryser View Post
    above is statement of the year ..........................

    In 984, Ibn Sahl first discovered the law of refraction, usually called Snell's law, which he used to work out the shapes of anaclastic lenses that focus light with no geometric aberrations.

    Early attempts at making aspheric lenses to correct spherical aberration were made by René Descartes in the 1620s, and by Christiaan Huygens in the 1670s; the cross-section of the shape devised by Descartes for this purpose is known as a Cartesian oval. The Visby lenses found in Viking treasures on the island of Gotland dating from the 10th or 11th century are also aspheric, but exhibit a wide variety of image qualities, ranging from similar to modern aspherics in one case to worse than spheric lenses in others. The origin of the lenses is unknown, as is their purpose (they may have been made as jewelry rather than for imaging).
    The pin cushion affect on those high plus spherical lenses made their hats look even goofier, hence the need and development for asphericity. In 1672, the next year they were acquired for their world class technology and moved to Newfoundland.

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    Redhot Jumper .............that is also the year they also started the development of Newfie jokes

    Quote Originally Posted by Lab Insight View Post

    In 1672, the next year they were acquired for their world class technology and moved to Newfoundland.

    ..............that is the year they also started the development of Newfie jokes which became more famous than their lenses.
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    Quote Originally Posted by Chris Ryser View Post
    ..............that is the year they also started the development of Newfie jokes which became more famous than their lenses.
    Ahhh, the good ole Newfie jokes. Those never get old.....

    A couple of Newfile pilots land in Toronto for the first time. As they're taxiing in, the one pilot says "lard tundering are these runways here ever so short". The other pilot says "yes dey sure are, and so wide!"

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    Back on topic....so, is there any evidence of what the Egyptians or Mesopotamians used their crude lenses for? Not likely they were for visually related functions? Crude magnifying glasses? Attractive oddities?

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    Oddities

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    papyrus-weights

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