title: Accuracy and performance of a commercially available Dosing Aid.
abstract: OBJECTIVE
  To evaluate the recently introduced Travatan Dosing Aid (TDA) for its accuracy in recording and dispensing eyedrops.
  
  
  METHODS
  The number of eyedrops dispensed with each lever depression and agreement of total number of drops dispensed with that recorded by the device was evaluated in a controlled setting.
  
  
  RESULTS
  The TDA correctly recorded a drop being dispensed 100% of the time with full TDA lever depression for <3 s. Under these conditions, agreement between numbers of drops dispensed and recorded was 99%. However, failure to fully depress the lever or prolonged lever depression for >4 s resulted in unreliable TDA recording.
  
  
  CONCLUSIONS
  Eyedrops were reliably recorded by the TDA after each full lever depression. However, patients need to be instructed about optimal technique so that evaluation of compliance is not confounded by mechanical factors.
authors.affiliation: UPMC Eye Center, University of Pittsburgh, 203 Lothrop Street, Suite 800, Pittsburgh, PA 15213, USA.
authors.forename: Tara H
authors.initials: TH
authors.lastname: Cronin
authors.forename: Malik Y
authors.initials: MY
authors.lastname: Kahook
authors.forename: Kira L
authors.initials: KL
authors.lastname: Lathrop
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Noecker
mesh_terms: D000959:Antihypertensive Agents / Q000008:administration & dosage*; D003008:Cloprostenol / Q000008:administration & dosage / Q000031:analogs & derivatives*; D004334:Drug Administration Schedule; D016503:Drug Delivery Systems / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D009883:Ophthalmic Solutions; D010349:Patient Compliance; D000069557:Travoprost
chemical_list: D000959:Antihypertensive Agents; D009883:Ophthalmic Solutions; D003008:Cloprostenol; D000069557:Travoprost