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US 10,591,747 B2Granted
Contact lens inspection method and system
AssigneeAlcon Inc.
InventorsSteffen Paulekuhn, Susanne Fechner, Sarah Unterkofler, Daniel Kessler, Evgeni Schumm, Matthias Schwab
Life of this patent
Estimating the term…
Abstract
Disclosed is an inspection and system method and system for determining the orientation of a contact lens on a lens support, particularly in an automated contact lens manufacturing line.
Claims9
A method for determining the orientation of a contact lens on a lens support comprising the steps of:
- providing a contact lens having a lens center and a sagittal height (h),
- providing a lens support,
- arranging the contact lens on the lens support,
- providing a camera system having a depth of field of less than the sagittal height (h),
- illuminating the contact lens arranged on the lens support with a light beam,
- focusing the camera system to a set focus corresponding to the expected position of the lens center of the properly oriented contact lens arranged on the lens support with the lens center of the properly oriented contact lens on the lens support being within the depth of field of the focused camera system,
- producing an image of the contact lens,
- scanning the image of the contact lens in at east one image portion (S) of a predetermined size;
- determining the image defocus of the at least one image portion (S),
- determining the orientation of the contact lens from the image of the contact lens by comparing the determined image defocus with a predetermined threshold (T).
7 more elements
Dependencies are inferred from the claim text.