- Participants will receive the study eye drops at the initial visit. The drops must be used three or four times a day for 2 weeks. They must be stored in a cool place (like a refrigerator). The doses will follow an escalation schedule with the first participant receiving 2 drops three times a day and the last participant receiving 4 drops four times a day. To maximize safety, the most-recently enrolled participant will complete Week 4 before the next participant can enroll (e.g., the second enrolled participant will not be enrolled until the first has completed the Week 4 visit).