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公开(公告)号：US20200183192A1
公开(公告)日：2020-06-11
申请号：US16708685
申请日：2019-12-10
Applicant: Alcon Inc.
Inventor： Yeming Gu , Curtis Dean McKenney , Cornelius Daniel Niculas
Abstract: A method of manufacturing of an astigmatic contact lens having a toric portion and a thickness differential feature to provide lens orientation on eye portion such that said thickness differential causes the toric portion of the contact lens to properly orient in the eye of the wearer. The toric lenses are manufactured by an effective process control method for cylinder power in toric lens production by determining an amount of a mold cylinder compensation which is caused by processes in a toric lens manufacturing system including tool making, injection molding, casting and curing, wherein the mold cylinder is defined as the difference in measured radius of curvature at two orthogonal directions. A control metric is established by using the amount of a mold cylinder compensation and tolerance range and reject mold out of the control limits and improve the production yield for toric lens manufacturing.
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公开(公告)号：US11207854B2
公开(公告)日：2021-12-28
申请号：US16708685
申请日：2019-12-10
Applicant: Alcon Inc.
Inventor： Yeming Gu , Curtis Dean McKenney , Cornelius Daniel Niculas
Abstract: A method of manufacturing of an astigmatic contact lens having a toric portion and a thickness differential feature to provide lens orientation on eye portion such that said thickness differential causes the toric portion of the contact lens to properly orient in the eye of the wearer. The toric lenses are manufactured by an effective process control method for cylinder power in toric lens production by determining an amount of a mold cylinder compensation which is caused by processes in a toric lens manufacturing system including tool making, injection molding, casting and curing, wherein the mold cylinder is defined as the difference in measured radius of curvature at two orthogonal directions. A control metric is established by using the amount of a mold cylinder compensation and tolerance range and reject mold out of the control limits and improve the production yield for toric lens manufacturing.
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