The efficacy and safety of the Dorzolamide—timolol combination versus the concomitant administration of its components11Ms. Strohmaier and Drs. Snyder and Adamsons are employees of Merck & Co., Inc, the manufacturer of the dorzolamide-timolol combination. Dr. DuBiner has no proprietary interest in the dorzolamide-timolol combination or Merck.