Extended wear ophthalmic lens

  • US 5,965,631 A
  • Filed: 07/01/1998
  • Issued: 10/12/1999
  • Est. Priority Date: 09/06/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. An ophthalmic lens having ophthalmically compatible inner and outer surfaces, said lens being suited to extended periods of wear in continuous, intimate contact with ocular tissue and ocular fluids, said lens comprising a polymeric material which has a high oxygen permeability and a high ion permeability, said polymeric material being formed from polymerizable materials comprising:

  • (a) at least one oxyperm polymerizable material and(b) at least one ionoperm polymerizable material,wherein said lens allows oxygen permeation in an amount sufficient to maintain corneal health and wearer comfort during a period of extended, continuous contact with ocular tissue and ocular fluids, andwherein said lens allows ion or water permeation via ion or water pathways in an amount sufficient to enable the lens to move on the eye such that corneal health is not substantially harmed and wearer comfort is acceptable during a period of extended, continuous contact with ocular tissue and ocular fluids,wherein said polymeric material has an oxygen permeability of at least about 84 barrers and said ophthalmic lens has an ion permeability characterized either by (1) an Ionoton Ion Permeability Coefficient of greater than about 0.2×

    10-6 cm2 /sec or (2) an Ionoflux Diffusion Coefficient of greater than about 1.5×

    10-6 mm2 /min, wherein said ion permeability is measured with respect to sodium ions.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×