Evaluation of Daytime Corneal Swelling During Wear of Galyfilcon A Lenses

Inclusion Criteria: * Be of legal age (i.e. 18 years) * Be of Asian descent and have -Asian eye‖ identifying features (see Appendix A) * 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 3 months prior to the trial ) without experiencing difficulties or contact lens related complications * Have had an oculo-visual examination within the previous 12 months. * 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 evidence of lid abnormality or infection * No conjunctival abnormality or infection * No clinically significant slit lamp findings (i.e. edema, staining, scarring, vascularization, infiltrates or abnormal opacities) * No other active ocular disease Exclusion Criteria: * Requires concurrent ocular medication. * Clinically significant (Grade 3 or 4) corneal staining (FDA scale), corneal stromal haze, corneal vascularization, tarsal abnormalities, bulbar hyperemia, limbal hyperemia, or any other abnormality of the cornea that would contraindicate contact lens wear. * Has had refractive surgery. * Has had any anterior ocular surgery. Has had any other ocular surgery or injury within 8 weeks immediately prior to enrolment for this study. * History of abnormal lachrymal secretions. * Pre-existing ocular irritation that would preclude contact lens fitting. * Keratoconus or other corneal irregularity. * Extended lens wear in last 3 months. * PMMA, hybrid or RGP lens wear in the previous 8 weeks * Any systemic illness which would contraindicate lens wear or the medical treatment of which would affect vision or successful lens wear. * Has diabetes * Known/reported infectious disease (e.g., hepatitis, tuberculosis) or an immunosuppressive disease (e.g., HIV). * History of chronic eye disease (e.g. glaucoma or ARMD). * Pregnancy, lactating, or planning a pregnancy at the time of enrolment. * Participation in any concurrent clinical trial or in last 30 days. * Family member or employee of the clinical site, investigator or other study staff. * Currently wears habitual contact lenses on an EW basis.