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For cameras or prescription glasses??? If it’s the latter- it’s literally too close for comfort.

• terramex 5y ago
  For cameras, usually those use thoriated glass due to its high refractive index. Radioactivity level is too low for even slightest damage as thorium dioxide mostly emits alpha particles that is easily blocked. There are urban legends about radioactive lenses causing fogging of the film inside a camera if left mounted for few years but I couldn't verify them. https://en.m.wikipedia.org/wiki/Thoriated_glass https://en.m.wikipedia.org/wiki/Thoriated_glass https://camerapedia.fandom.com/wiki/Radioactive_lenses https://camerapedia.fandom.com/wiki/Radioactive_lenses
  • mnw21cam 5y ago
    One large problem with thoriated glass lenses is that they tend to lose transparency. See the "Radiation browning" section of parent's first link.
    • gerikson 5y ago
      I have a 35mm Nikkor with thoriated glass. It has a slight yellow tint that’s easily corrected in post.