Patents Assigned to Rotsana Investments LLC
  • Multifocal lens article
    Patent number: 6244709
    Abstract: The present invention is directed toward a multifocal contact lens having an improved front-surface lens design, which design can be used either as a stand-alone multifocal design for both distance- and near-vision correction or, in combination with a back-surface multifocal design, as a means to provide additional power for near-vision correction. In one embodiment of the invention, the contact lens has a front surface comprising a central elliptical curve, a mid-peripheral polynomial curve, and a lenticular spherical curve.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: June 12, 2001
    Assignees: Bausch & Lomb Incorporated, Rotsana Investments LLC
    Inventors: Michael M. Vayntraub, Richard R. Martin