| 摘要 |
<p>The lens has a conical shaped base body having an upper face with a surface higher than surface of a lower face (9). A covering cone surrounds the body laterally when upper and lower openings allow a user to see an eye of a patient against the lower face of the body via a lens cone unit. A side face of the body has sections (13, 14) having plane surfaces separated from each other by intermediate conical sections (16, 17) that are covered with a dark matter layer such as painting or varnish of black color. The plane surface sections are located away from an interior surface of the cone.</p> |
