| 摘要 |
A refractive adapter for correcting accomodation disorders caused by prolonged exposure to video terminals or work involving minute objects and for helping to reduce eye strain caused by excessive visual stress at work or in leisure activites. The system comprises rotating corrective lens of various stengths, to be used as required, housed inside the spectacle frame. Rotation occurs by apllying pressure with a fingertip on the projecting lens housed in the frame slots, or by friction of a motor, consisting of a bearin with an outer surface in plastic to ensure a high friction coefficient with the moving body. The controls may be either mechanical (powered with a touch of the finger) or electromechanical (powered by a light source). The system may be an actual spectacle frame with mounted lens or a device apllied to an existing frame.
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