Key Inclusion Criteria:  Currently wearing any commercial spherical soft contact lenses with at least 3 months wearing experience. Willing to wear the study lenses for a minimum of 5 days per week and 8 hours per day. Willing to NOT use rewetting/lubricating drops at any time during the study. Other protocol-defined inclusion criteria may apply.  Exclusion Criteria:  Participation in a clinical trial within the previous 14 days or currently enrolled in any clinical trial. Habitual AOHP contact lens wearers (in the past 3 months). Monovision wear during the study. Other protocol-defined exclusion criteria may apply.