Article Text

Download PDFPDF
Accuracy and performance of a commercially available Dosing Aid
  1. Tara H Cronin,
  2. Malik Y Kahook,
  3. Kira L Lathrop,
  4. Robert J Noecker
  1. UPMC Eye Center, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
  1. Correspondence to: Dr Robert J Noecker University of Pittsburgh, 203 Lothrop Street, Suite 800, Pittsburgh, PA 15213, USA; noeckerrj{at}


Aim: 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.

Conclusion: 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.

  • TDA, Travatan Dosing Aid

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.


  • Published Online First 17 August 2006

  • Competing interests: RJN and MYK have received speaking fees from Alcon.