| 摘要 |
<p>The invention relates to a vision screen with a continuous, cylindrical, toroidal or spherical convex surface (2), having a trace in a binocular plane of vision forming an outer arc of circle with a predetermined radius (R), the vision screen having a concave surface with a trace in said same plane of vision forming at least one region around a point where each line of vision (AD, AG) crosses the concave surface of an inner arc of circle (3, 4) with a specific curvature radius (R1), and a centre (C1, C2) other than that of the arc of circle crossed by the other line of vision, characterised in that the specific radius (R1) of each inner arc of circle is other than the radius (R) of the outer arc of circle.</p> |
