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1. 发明授权

US5502517A Soft contact lens with a back surface whose central and intermediate portions are formed by different ellipsoidal surfaces continuously contiguous to each other 失效
标题翻译：柔性隐形眼镜具有后表面，其中部和中间部分由彼此连续相邻的不同椭圆面形成
公开(公告)号：US5502517A
公开(公告)日：1996-03-26
申请号：US232035
申请日：1994-04-26
申请人： Naoki Anan , Bungo Takagi , Kazuya Miyamura
发明人： Naoki Anan , Bungo Takagi , Kazuya Miyamura
IPC分类号： G02C7/04
CPC分类号： G02C7/04
摘要： The present invention was developed to improve wearing conditions of a soft contact lens while improving production efficiency of the soft contact lens and assuring an enhanced optical effect offered by the lens. The present soft contact lens has a back surface, a front surface and a connecting surface. The back surface of the lens is constituted by: a central portion formed by an ellipsoidal surface with an eccentricity in the range of 0.2-0.7 and a vertex radius of curvature in the range of 5.00-10.00 mm; an intermediate portion which is located at the periphery of the central portion so as to surround the central portion and is formed by another ellipsoidal surface with an eccentricity in the range of 0.2-0.7, at least one of the eccentricity and a vertex radius of curvature of the ellipsoidal surface of the intermediate portion being different from that of the ellipsoidal surface of the central portion; and a marginal portion which is located around the periphery of the intermediate portion and formed so that the marginal portion is spaced away from the cornea such that an axial clearance between the cornea and the back surface of the contact lens increases with an increase in a distance of the marginal portion from the intermediate portion in a radially outward direction. The central, intermediate and marginal portions are continuously contiguous to each other to provide the back surface of the lens.
摘要翻译： PCT No.PCT / JP93 / 01546 Sec。 371日期1994年04月26日 102（e）日期1994年4月26日PCT提交1993年10月26日PCT公布。第WO94 / 10599号公报日期：1994年5月11日本发明旨在改善软性隐形眼镜的磨损状况，同时提高软性隐形眼镜的生产效率，并确保透镜提供的增强的光学效果。本软性隐形眼镜具有背面，前表面和连接表面。透镜的后表面由以下部分构成：中心部分由椭圆面形成，偏心率在0.2-0.7范围内，顶点曲率半径在5.00-10.00mm范围内; 中间部分位于中心部分的周边以围绕中心部分并且由偏心在0.2-0.7范围内的另一个椭圆面形成，偏心度和顶点曲率半径中的至少一个所述中间部的椭圆面不同于所述中央部的椭圆面的椭圆面; 以及边缘部分，其位于中间部分的周边周围并且形成为使得边缘部分与角膜间隔开，使得角膜与隐形眼镜的背面之间的轴向间隙随着距离的增加而增加的边缘部分在径向向外的方向上从中间部分。中央，中间和边缘部分彼此连续地邻接以提供透镜的后表面。

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