Double focus ophthalmology lens |
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| 申请号 | JP19783191 | 申请日 | 1991-08-07 | 公开(公告)号 | JPH04254817A | 公开(公告)日 | 1992-09-10 |
| 申请人 | Minnesota Mining & Mfg Co <3M>; | 发明人 | JIYON ANDORIYUU FUZEI; MAIKERU JIYON SHINPUSON; | ||||
| 摘要 | PURPOSE: To obtain excellent sight by combining the both of a diffraction effect and a refractive effect and providing essentially optical ability concerning a double focus ophthalmology lens. CONSTITUTION: A lens 40 is formed by a smooth front surface 42 and a back surface which is constituted by providing series of diffractive zones 46, 48, 50, 52 and 54 and the respective zones are separated by an optical step 44 being about two-thirds of design wave length through the use of the light dividing range of the max. light adaptation sensitivity of human eyes. The lens is provided with diffractive ability and two focuses, the first focus is related to first diffraction and the second focus is related to second diffraction. COPYRIGHT: (C)1992,JPO |
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