| 摘要 |
<p>The pair of spectacles is used for improving images for TV and Cinema viewers. Image clarity and definition generally are improved by opaque masks with a central opening held in spectacle frames. The masks may be flat with adjustment of the aperture size by an iris, or they may be in the form of truncated cones. Both forms of mask may be in any suitable low cost material such as a plastics.</p> |
