Level of disagreement between Proview™ phosphene tonometer and Goldmann applanation tonometer intraocular pressure readings

Sushma Rai, Marlene R. Moster, Muge Kesen, Joann Fontanarosa, George L. Spaeth, William C. Steinmann, Richard Wilson, Jonathan Myers, Jeffrey Henderer

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Purpose: To evaluate the agreement of intraocular pressure (IOP) readings obtained with the Preview™ phosphene tonometer and those obtained by Goldmann applanation tonometry as well as the effect of regular use of the Preview™ on patients' anxiety about their glaucoma. Methods: One hundred thirty-five consecutive patients with glaucoma, 35 designated as controls, were enrolled in a 10-month randomized prospective clinical trial. The study patients but not the controls used the Preview™ outside the office. At office visits IOP was measured by an ophthalmologist with the Goldmann applanation tonometer (GAT) as well as by examiners and patients using the Preview™. Patients in the treatment group (n = 100) were asked to measure and record their IOP at home as well. Using ANOVA, we examined the relationship between demographic variables and the level of agreement between the Preview™ readings and those measured by GAT at the final office visit. All participants also were asked to complete a questionnaire regarding their anxiety about their IOP at the baseline and final office visits. The primary outcome measure was the level of agreement of the Preview™ measurements with those obtained by GAT. Secondary outcome measures included patients' anxiety about their glaucoma. Results: The absolute mean difference between GAT and Preview™ readings at the final visit was 3.5 ± 2.9 mm Hg (median, 2.8 mm Hg). The treatment group reported significantly less anxiety about their glaucoma after 4 to 6 weeks of using the Preview™ (P = .024). Conclusions: There was considerable discrepancy between Preview™ and GAT readings. However, regular use of the PreviewA™ tonometer significantly reduced patients' anxiety about their glaucoma.

Original languageEnglish (US)
Pages (from-to)120-123
Number of pages4
JournalJournal of Glaucoma
Issue number2
StatePublished - Apr 2005


  • Intraocular pressure
  • Phosphene phenomenon tonometer

ASJC Scopus subject areas

  • Ophthalmology

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