| 摘要 |
<p>A bi-focal corneal lens (1) of uniform index of refraction, which is self-orienting, has a border (6, 7) of increased thickness with the border (6) along the lower near-vision segment (2) thicker than the border (7) along the upper distant-vision segment (3) and thick enough (CI) to prevent overlapping by the lower lid. The lens is cut on a lathe with a lenticular attachment, so the various curves can be cut in a minimum of passes. Mathematical equations are furnished to be fed to a computer, which calculates the parameters of the various curves in accordance with the data furnished by an optician.</p> |
