| 摘要 |
Improved, two-purpose, safety glasses characterised in that they include eyepieces each having two surfaces of very distinct opacity, for example a highly tinted part 2 and a highly transparent part 3, the passage from one use to the other, that is to say the change in vision, being performed by tilting the head downwards, or the reverse. Use especially in the field of welding operations in order to be protected from high luminosities. <IMAGE>
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