title: Oculab Tono-Pen, Goldmann applanation tonometry, and pneumatic tonometry for intraocular pressure assessment in gas-filled eyes.
abstract: We performed 84 intraocular pressure measurements with the Oculab Tono-Pen, Goldmann applanation tonometer, and pneumatic tonometer in 47 eyes that had undergone pars plana vitrectomy and gas-fluid exchange. Measurements made by using the Tono-Pen were accurate when compared to those made by Goldmann tonometry (mean difference, 0.74 mm Hg). In a subset of eyes with increased intraocular pressure (greater than or equal to 25 mm Hg), the Tono-Pen provided measurements similar to those made by Goldmann applanation tonometry (P greater than .60), with only three of 39 readings (8%) underestimating the Goldmann pressure by more than 3 mm Hg. Pneumatic tonometry significantly underestimated the intraocular pressure in eyes with increased pressure (P less than .001), with 20 of 39 readings (51%) underestimating the Goldmann pressure by 5 mm Hg or more.
authors.affiliation: Texas Retina Associates, Dallas 75231.
authors.forename: M W
authors.initials: MW
authors.lastname: Hines
authors.forename: B F
authors.initials: BF
authors.lastname: Jost
authors.forename: K L
authors.initials: KL
authors.lastname: Fogelman
mesh_terms: D005069:Evaluation Studies as Topic; D005123:Eye; D005740:Gases / Q000008:administration & dosage*; D006801:Humans; D007429:Intraocular Pressure; D011184:Postoperative Period; D014065:Tonometry, Ocular / Q000295:instrumentation / Q000379:methods*; D014821:Vitrectomy / Q000379:methods*
chemical_list: D005740:Gases