| 摘要 |
<p>A frame with an outer lens having a slit that stagnantly sealingly conforms to the user's face to create a stagnant air barrier that creates air resistance against airborne particles entering the slit, traversing the interior space, and then contacting the user's eyes. The user can see through the slit even if airborne particles deposited on the outer lens obscure the user's vision. Alternatively, a frame with an outer lens having slits for a user's eyes and a protective inner lens having transparent portions has an inlet communicating with the interior space created between the inner and outer lenses. A portable compressed air source introduces compressed air into the interior space to create an air stream that flows outwardly through the slits. The air stream prevents airborne particles from entering through the slits and into the interior space and contacting the inner lens, to maintain transparency. The user can carry the compressed air source and move freely.</p> |
