Daytime Corneal Swelling During Wear of Narafilcon B Lenses

Inclusion Criteria: * Be of legal age (i.e. ≥ 18 years). * Be mentally competent, willing and able to sign a written informed consent form. * Have contact lens distance sphere requirement in the range -1.00D to -6.00D. * Have spectacle astigmatism \<1.25D in each eye. * Currently wear soft contact lenses (for at least 6 months prior to the trial) with documentation of current prescription. * Have normal eyes with no evidence of abnormality or disease. For the purpose of this study a normal eye is defined as one having: i) no evidence of lid abnormality or infection; ii) no conjunctival abnormality or infection; iii) no clinically significant slit lamp findings (i.e, edema, staining, scarring, vascularization, infiltrates or abnormal opacities); iv) no other active ocular disease. Exclusion Criteria: * Required concurrent ocular medication. * Any systemic illness which would contra-indicate lens wear or the medical treatment of which would affect vision or successful lens wear. * Eye injury or surgery within eight weeks immediately prior to enrollment 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. * Participation in any concurrent clinical trial.