Alcon, Inc.

Justyna Justynska-Reimann

Stephan Wittmar

Thomas Schmidt

Claudio Hofmann

Roger Biel

Matthias Schwab

Markus Grebe

Michael Ruland

André Wicklein

A lens care container (), in particular for contact lenses such as hard or soft contact lenses, comprises: The sensor () is arranged in the receptacle () when the cap () is attached to the receptacle ().

Lens care container

The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) ('PMAA') in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.

High molecular weight poly(methacrylic acid)

The present invention relates to a method and an apparatus () for determining a coefficient of friction at a test site () on a surface () of a contact lens (). The apparatus comprises: a lens holder () arranged at least partially in a receptacle (); a slide () comprising a counter surface () made of lapped aluminum for contacting the test site (); a load generator () configured to apply a predetermined normal load (Fn) between the counter surface () and the test site; a drive () configured to generate a sliding movement between the counter surface () and the contact lens in direction located in a plane perpendicular to the normal load (Fn); and a force sensor () configured to measure a tangential frictional force (Ft) between the test site and the counter surface () along the direction of the sliding movement.

Method and apparatus for determining a coefficient of friction at a test site on a surface of a contact lens

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Oppenheim, Germany

Justyna Justynska-Reimann