Key Inclusion Criteria:  Current wearer of a commercial spherical weekly/monthly soft contact lenses with at least 3 months of wearing experience, with a minimum wearing time of 5 days per week and 10 hours per day. Manifest cylinder less than or equal to 0.75 diopter in each eye. Best corrected distance visual acuity better than or equal to 20/25 Snellen in each eye. Other protocol-defined inclusion criteria may apply.  Key Exclusion Criteria:  Monovision or multifocal lens wearer. Habitual senofilcon contact lens wearer (for example, Acuvue Oasys, Acuvue Vita) or commercially available lehfilcon A contact lens wearer (TOTAL30). Routinely sleeps in habitual contact lenses. Other protocol-defined exclusion criteria may apply.