| 摘要 |
PURPOSE:To obtain agreeable both-eye visibility, by installing a telephone type lens group consisting of a combination of a convex lens as a front element and a concave lens as a rear element, as spectacles, in front of healthy eyes, when an eyesight correcting convex lens of a suitable number of diopters, as spectacles, in front of noncrystalline lens eyes. CONSTITUTION:In front of a noncrystalline lens eye 1, a planoconvex lens 4 is placed, and in front of a healthy eye 2, telephoto type combination lenses 6 and 5 are installed. A front element 6 is biconvex type convex lens, and a rear element 5 is a biconcave type concave lens. By refractive power of the lenses 6 and 5, and a crystalline lens 3, size of an image which is seen by the healthy eye is allowed to coincide with size of an image which is seen by the noncrystalline lens eye through the convex lens 4, by which normal both-eye visibility can be executed. |
