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AssigneeCooperVision International Limited
InventorsArthur Bradley, Martin Webber, Paul Chamberlain, Baskar Arumugam, David S. Hammond
Estimating the term…
A contact lens (201) includes an optic zone (202) that is centred on an optical axis (219), and a peripheral zone (204) surrounds the optic zone (202). A cross-sectional slice through the optic zone (202) along a meridian comprises a series of successive arcs (203a-203h) having a radial curvature power profile. The radial curvature power profile increases monotonically with radial distance from the optical axis (219). Light rays from a distant point source passing through the midpoint of each arc converge toward a point (215) on the first optical axis (203a-203h). For each arc (203a-203h), light rays from a distant point source pass through that arc (203a-203h) and converge towards a point (216) that is spaced away from the optical axis by a first distance. Methods of designing and manufacturing such contact lenses (201) are also described.
A contact lens, the lens including an optic zone centred on an optical axis, and a peripheral zone surrounding the optic zone, wherein a cross-sectional slice through the optic zone taken along a meridian comprises a series of successive arcs comprising at least 10 arcs extending radially outwardly from the optical axis, and having a radial curvature power profile that increases monotonically with radial distance from the optical axis, wherein light rays from a distant point source passing through the midpoint of each arc converge towards a point on the first optical axis, and wherein for each arc, light rays from a distant point source passing through that arc converge towards a point that is a first distance from the optical axis.
A method of designing a contact lens, the method comprising:
A contact lens, the lens including an optic zone centred on an optical axis, and a peripheral zone surrounding the optic zone, wherein the optic zone comprises a series of contiguous rings comprising at least 10 rings extending radially outwardly from the optical axis, and having a radial curvature power profile that increases monotonically with radial distance from the optical axis, wherein light rays from a distant point source passing through the midpoint of the width of each ring converge towards a point on the first optical axis, and wherein for each ring, light rays from a distant point source passing through that ring converge towards a point that is a first distance from the optical axis.
Dependencies are inferred from the claim text.