公开(公告)号：US4549794A

公开(公告)日：1985-10-29

申请号：US491638

申请日：1983-05-05

申请人： Samuel Loshaek ,  Malcolm G. Townsley

发明人： Samuel Loshaek ,  Malcolm G. Townsley

IPC分类号： G02C7/04 ,  G02C7/06

CPC分类号： G02C7/043 ,  G02C7/045 ,  G02C7/048

摘要： Hydrophilic bifocal corneal contact lenses of the alternating-vision type having a critical set of dimensions for the various elements which results in a surprising increase in the success rate of persons wearing these improved lenses.

摘要翻译： 交替视觉类型的亲水性双焦点角膜隐形眼镜具有各种元件的关键尺寸尺寸，这导致佩戴这些改进的镜片的人的成功率惊人地增加。

公开(公告)号：US3937566A

公开(公告)日：1976-02-10

申请号：US446399

申请日：1974-02-27

申请人： Malcolm G. Townsley

发明人： Malcolm G. Townsley

IPC分类号： G02C7/04

CPC分类号： G02C7/04

摘要： A process for prescribing and manufacturing contact lenses wherein a first concave curvature is developed on the interior face of the lens in the central optical zone. This concave curvature conforms to a portion of a sphere having a radius equal to the radius of a base curve determined to be suitable for the particular patient. A second concave curvature is developed on the interior face of the lens to provide a bearing zone in surrounding relationship relative to the optical zone. The second curvature conforms to an annulus of a sphere having a radius determined by the slope of the patient's eye at points of contact of the second curvature with the eye. The slope is determined by calculating the eccentricity of the ellipsoidal surface which most closely describes the shape of the patient's eye.