History Facts & Stories on Instagram: "In 1948 contact lenses were still a fairly new technology and were made almost entirely from hard plastic, specifically polymethyl methacrylate. These early lenses were not the soft, flexible type used today. Instead they were rigid shells that rested directly on the surface of the eye and covered not only the cornea but often part of the sclera as well. Because they did not allow oxygen to pass through the material, wearers could typically tolerate them on

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104K views · 2.3K reactions | Angular contact ball bearing https://amzn.to/4alX75v #ballbearing #bearing | Research by Deepak | Facebook

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