Residence Time Evaluation of Systane Ultra Lubricant Eye Drops vs. Hialid and Saline

Inclusion Criteria: * Diagnosed with mild to moderate dry eye as defined in the protocol. * Able and willing to follow instructions. * Other protocol-defined inclusion criteria may apply. Exclusion Criteria: * Any medical condition that may affect the results of the study. * History or evidence of ocular or intraocular surgery within the past six months. * History of intolerance or hypersensitivity to any component of the study medications. * Use of concomitant topical ocular medications during the study period. * Ocular conditions that may preclude safe administration of the test article. * Unwilling to discontinue contact lens wear during the study period. * Participation in an investigational drug or device study within 30 days of enrollment. * Other protocol-defined exclusion criteria may apply.