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 language||English (US)|
|Number of pages||4|
|Journal||Journal of Glaucoma|
|State||Published - Apr 2005|
- Intraocular pressure
- Phosphene phenomenon tonometer
ASJC Scopus subject areas