RT Journal Article SR Electronic T1 Predictive value of tonometry with Tono-pen® XL in primary care JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 653 OP 654 VO 57 IS 541 A1 Pedro Beneyto A1 Miguel A Barajas A1 Francisa Garcia-de-Blas A1 Isabel del Cura A1 Teresa Sanz A1 Rocio Vello A1 Carmela Salvador YR 2007 UL http://bjgp.org/content/57/541/653.abstract AB This is a descriptive study designed to assess the predictive value of intraocular pressure (IOP) measurement in GPs' offices in an urban healthcare site using Tono-pen® XL. A total of 2044 patients, aged ≥40 years, were enrolled by consecutive sampling from patients visiting the GP. Those participants who had IOP ≥21 mmHg were referred to the ophthalmologist. Of the 226 then tested, ocular hypertension was confirmed in 100 participants (4.89%, 95% CI [confidence interval] = 3.93 to 5.85%). Predictive value was 44.2%. These results suggest the validity of using Tono-pen XL in the GP's office to detect ocular hypertension.