4. Optics: eye examining, vision testing and correcting
  5. Spectacles and eyeglasses
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Glasses attachment for a protective mask

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Combined
Patent

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Glasses with color-switchable, multi-layered lenses

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Combined
Patent

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Glasses with subliminal message

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Combined
Patent

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