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公开(公告)号：EP0039544A3
公开(公告)日：1982-10-27
申请号：EP81301541
申请日：1981-04-08
发明人： Kitani, Akira
摘要： A progressive multi-focal lens having a distant viewing zone (8), a near viewing zone (9), and a progressive zone (10) there between. Side zones (11, 12) are provided beside the progressive (10) and near (9) viewing zones. The side zones (11, 12) are spheric surfaces, with a dioptric refractive power, in one embodiment, being the arithmetic mean value of the refractive power of the near and distant viewing zones. This eliminates or reduces astigmatism problems in the side areas and permits normal side sight. Transitions between zones may be smoothed to render them less conspicuous.
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公开(公告)号：EP0039544A2
公开(公告)日：1981-11-11
申请号：EP81301541.9
申请日：1981-04-08
发明人： Kitani, Akira
摘要： A progressive multi-focal lens having a distant viewing zone (8), a near viewing zone (9), and a progressive zone (10) there between. Side zones (11, 12) are provided beside the progressive (10) and near (9) viewing zones. The side zones (11, 12) are spheric surfaces, with a dioptric refractive power, in one embodiment, being the arithmetic mean value of the refractive power of the near and distant viewing zones. This eliminates or reduces astigmatism problems in the side areas and permits normal side sight. Transitions between zones may be smoothed to render them less conspicuous.
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