Presbyopia
One drop in each eye once daily, with an optional second drop in each eye 3 to 6 hours later
Near vision improves within 15 minutes; the 3-line gain is no longer significant by hour 8.
Presbyopia after LASIK or PRK
One drop in each eye once daily, with an optional second drop in each eye 3 to 6 hours later
After prior LASIK or PRK, the near-vision gain holds only through about 3 hours.