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¹Harran Üniv.Tıp Fakültesi Göz Hastalıkları Ana Bilim Dalı, Şanlıurfa,
²Gazi Üniversitesi Tıp Fakültesi Göz Hastalıkları Ana Bilim Dalı, Ankara We performed a clinical study comparing the Tono-Pen with Goldmann tonometer in silicone oil-filled vitrectomized eyes. 39 eyes filled with silicon oil following vitrectomy of 35 patients [20 males, 15 females; the mean age±SD; 45.2±6.54 (ranged from 10 to 67)] were enrolled in the study. We measured intraocular pressure of same eyes with both the Tono-Pen and Goldmann tonometers. The mean intraocular pressure values were calculated and compared statistically. The mean intraocular pressure by Tono-Pen and Goldmann tonometers were measured to be 21.62±10.23 mm Hg and 22.78±11.61 mm Hg, respectively. Analysis of the data demonstrated that there was no significant difference between measurements obtained with two tonometers in all ranges of intraocular pressure (p=0.120). Also, the mean Tono-Pen and Goldmann tonometer pressures were respectively 29.86±8.62 and 32.33±9.68 mm Hg for intraocular pressures greater than 21 mm Hg, and there was no significant difference between both tonometers in this subgroup (p=0.095). There was a difference of 3 mm Hg in 23 eyes (71.9%) between two tonometers values. Tono-Pen tonometer overestimated more than 3 mm Hg in three (15.6%) of 32 the Goldmann intraocular pressure readings, and underestimated more than 3 mm Hg in seven (21.9%) of 32 the Goldmann intraocular pressure readings. The Tono-Pen may play a valuable role in measuring intraocular pressure of vitrectomized silicone-filled eyes in which accurate Goldmann applanation tonometry is not possible. Keywords : Goldmann applanation tonometer, Intraocular pressure, Silicone oil, Tono-Pen tonometer, Vitrectomy