Clinical Trial of Several Contact Lenses in Extended Wear

Inclusion Criteria: * Be of legal age, and be between 18 and 39 years of age. * Signed Written Informed Consent and Investigator to record this on Case Report Form (CRF) in appropriate space. * Require a visual correction in both eyes (Monovision not allowed) * Require a soft contact lens spherical correction between -0.50 and -9.00D. * Have an astigmatic correction less than 1.50D in both eyes. * Be able to wear the lens powers available for this study. * Be able to regularly wear the lenses on a 7 day/6 night extended wear basis (e.g. does not regularly swim more than once a week) * Be correctable to a visual acuity of 20/30 or better in each eye. * Have normal eyes with no evidence of abnormality or disease. For the purposes of this study a normal eye is defined as one having: * No amblyopia. * No evidence of lid abnormality or infection. * No clinically significant slit lamp findings * No other active ocular disease. * No previous ocular surgery. Exclusion Criteria: * Requires concurrent ocular medication. * Any systemic illness which would contraindicate lens wear or the medical treatment of which would affect vision or successful lens wear. * No Clinically significant (Grade 3 or 4) slit lamp findings including corneal edema, corneal vascularization, corneal staining, tarsal abnormalities, bulbar injection, or any other abnormality of the cornea that would contraindicate contact lens wear. * Diabetic. * Infectious disease (e.g., hepatitis, tuberculosis) or an immunosuppressive disease (e.g., HIV). * PMMA or RGP lens wear in the previous 8 weeks. * Has had refractive surgery. Has had eye injury/surgery within 8 weeks immediately prior to enrolment for this study. * Abnormal lacrimal secretions. * Pre-existing ocular irritation that would preclude contact lens fitting. * Keratoconus or other corneal irregularity. * Pregnancy, lactating or planning a pregnancy at the time of enrollment only. * Participation in any concurrent clinical trial. * Currently wearing B\&L PureVision, Ciba O2 Optix, Ciba Night \& Day, CooperVision Biofinity, Vistakon ACUVUE® OASYS, or Vistakon ACUVUE®2 on an EW basis * Has had previous adverse event(s) contraindicating EW e.g. MK or greater than 2 corneal scars which appear to be contact lens related (e.g. not trauma related). * Has had an eye injury or surgery within the last eight weeks.