A Dose-ranging Study to Evaluate the Safety and Efficacy of UNR844 in Subjects With Presbyopia.

Inclusion Criteria: * Written informed consent must be obtained before any assessment is performed * Impaired near vision in each eye and when using both eyes, without any near correction * Need a certain level of near correction Exclusion Criteria: * Impaired distance vision in either eye, with distance correction (if any) * Severe short- or long-sightedness * Any significant medical or clinical conditions affecting vision, the eyes or general health