Evaluation of the iop-lowering effect of a multi-pressure dial at different negative pressure settings

Russell J. Swan, Tanner J. Ferguson, Manjool Shah, Kelly W. Muir, Thomas W. Samuelson, Iqbal Ike K. Ahmed, Richard L. Lindstrom, Nathan M. Radcliffe, John P. Berdahl

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Purpose: To evaluate the intraocular pressure (IOP)-lowering effect of a multi-pressure dial (MPD) at targeted negative pressure settings. Methods: Prospective, intrasubject controlled study of 65 healthy subjects randomized to receive no negative pressure for 60 minutes or negative pressure application at designated levels of 25%, 50%, and 75% of baseline IOP for 20 minutes each. The main outcome measure was mean IOP with application of negative pressure. Results: In the study eye group, from a baseline IOP of 15.8 ± 3.6 mm Hg, the mean IOP was 13.5 ± 3.4, 11.5 ± 3.1, and 10.2 ± 2.7 mm Hg with negative pressure settings of 25%, 50% and 75%, respectively. In the control eye group, from a baseline IOP of 15.5 ± 3.0 mm Hg, the mean IOP values at the same time points, without negative pressure, were 15.6 ± 3.0, 15.5 ± 2.5 and 15.3 ± 2.4 mm Hg. The difference between the mean IOPs of the two groups was significantly different at all negative pressure settings (P < 0.001) in comparison with baseline. There was one minor adverse event, a corneal abrasion, that was unrelated to device wear. Conclusions: Negative pressure application to the periocular space with a multi-pressure dial can produce titratable IOP reduction while the device is worn with active negative pressure. To our knowledge, this technology represents the first nonpharma-cologic, nonlaser, nonsurgical method for IOP reduction. Translational Relevance: This represents the first study demonstrating the IOP-lowering ability of the multi-pressure dial, a device that uses a novel IOP-lowering strat-egy by delivering negative pressure to the periocular region.

Original languageEnglish
Article number19
Pages (from-to)1-9
Number of pages9
JournalTranslational Vision Science and Technology
Issue number12
StatePublished - Nov 2020
Externally publishedYes


  • CSF pressure
  • MPD
  • Multi-pressure dial
  • Multi-pressure glaucoma management
  • Normal tension glaucoma
  • Open-angle glaucoma
  • Severe open-angle glaucoma


Dive into the research topics of 'Evaluation of the iop-lowering effect of a multi-pressure dial at different negative pressure settings'. Together they form a unique fingerprint.

Cite this