Alcon, Inc.

Sarah Unterkofler

Matthias Schwab

Susanne Fechner

Daniel Kessler

Marcus Heift

Steffen Paulekuhn

Evgeni Schumm

A method for determining the inversion state of a soft contact lens (), comprising imaging a soft contact lens having a convex surface () and a concave surface (), a lens center and a lens edge () surrounding said soft contact lens (), the method comprising using an optical coherence tomography system to obtain at least one sectional image of at least a part of the contact lens () comprising the lens edge (), determining a cross-sectional edge geometry of the contact lens () extending from the lens edge () towards the lens center of the contact lens in the sectional image, the cross-sectional edge geometry corresponding to the convex and concave surface boundaries of the contact lens () in the sectional image, selecting a parameter defining the cross-sectional edge geometry of the contact lens () imaged and comparing the parameter defining the cross-sectional edge geometry of the contact lens () with a predetermined parameter defining a cross-sectional edge geometry of a non-inverted contact lens to determine whether said contact lens () is inverted.

Contact lens inspection method and system

A contact lens inspection system, in particular for soft contact lenses, comprises a light source () for illuminating a contact lens to be inspected; a plenoptic camera () for producing an electronic plenoptic image; a processing unit () adapted for electronically processing the electronic plenoptic image of the contact lens and configured for refocusing the image.

Contact lens inspection system

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.

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Grosswallstadt, Germany

Sarah Unterkofler