A Rapid Pneumatic Applanation Tonometer

Comparison of Aqueous Outflow Facility Measurement by Pneumatonography and Digital Schiøtz Tonography

“…Friedenwald used applanation tonometry on seated patients as a means of checking the indentation calibration scale, based on the assumption that the mean IOP of normal eyes increased by 1 mm Hg upon lying down, owing to an identical pressure increment in the episcleral vein. 31 However, subsequent studies 32–39 report that this postural effect exceeds 1 mm Hg and is between 1.8 and 5 mm Hg. These studies suggest that the Schiøtz values may be significantly low, with the Schiøtz calibration in error by as much as 3 to 5 mm Hg.…”

Comparison of Aqueous Outflow Facility Measurement by Pneumatonography and Digital Schiøtz Tonography

“…Friedenwald used applanation tonometry on seated patients as a means of checking the indentation calibration scale, based on the assumption that the mean IOP of normal eyes increased by 1 mm Hg upon lying down, owing to an identical pressure increment in the episcleral vein. 31 However, subsequent studies 32–39 report that this postural effect exceeds 1 mm Hg and is between 1.8 and 5 mm Hg. These studies suggest that the Schiøtz values may be significantly low, with the Schiøtz calibration in error by as much as 3 to 5 mm Hg.…”

The relationship between intraocular pressure and glaucoma: An evolving concept

“…The probe is placed on the cornea and the pressure within the central tube increases to match the force generated by the IOP. 191 , 192 The probe is placed perpendicularly on the central cornea after anesthetization to obtain an accurate reading. Measurements can be obtained in the upright, lateral, and supine positions.…”

Tonometrie: Rückblick und Ausblick (Teil 2)

“…Pneumotonometer verwenden ebenfalls einen elektronischen Sensor zur IOD-Bestimmung und verwenden eine Messdüse, die aus einer mit Luft gefüllten Membran besteht und die Hornhaut berührt [12,13] (▶ Abb. 2).…”

Comparison of Aqueous Outflow Facility Measurement by Pneumatonography and Digital Schiøtz Tonography

“…Friedenwald used applanation tonometry on seated patients as a means of checking the indentation calibration scale, based on the assumption that the mean IOP of normal eyes increased by 1 mm Hg upon lying down, owing to an identical pressure increment in the episcleral vein. 31 However, subsequent studies 32–39 report that this postural effect exceeds 1 mm Hg and is between 1.8 and 5 mm Hg. These studies suggest that the Schiøtz values may be significantly low, with the Schiøtz calibration in error by as much as 3 to 5 mm Hg.…”

The relationship between intraocular pressure and glaucoma: An evolving concept

“…The probe is placed on the cornea and the pressure within the central tube increases to match the force generated by the IOP. 191 , 192 The probe is placed perpendicularly on the central cornea after anesthetization to obtain an accurate reading. Measurements can be obtained in the upright, lateral, and supine positions.…”

Tonometrie: Rückblick und Ausblick (Teil 2)

“…Pneumotonometer verwenden ebenfalls einen elektronischen Sensor zur IOD-Bestimmung und verwenden eine Messdüse, die aus einer mit Luft gefüllten Membran besteht und die Hornhaut berührt [12,13] (▶ Abb. 2).…”

Comparison of Aqueous Outflow Facility Measurement by Pneumatonography and Digital Schiøtz Tonography

“…Friedenwald used applanation tonometry on seated patients as a means of checking the indentation calibration scale, based on the assumption that the mean IOP of normal eyes increased by 1 mm Hg upon lying down, owing to an identical pressure increment in the episcleral vein. 31 However, subsequent studies 32–39 report that this postural effect exceeds 1 mm Hg and is between 1.8 and 5 mm Hg. These studies suggest that the Schiøtz values may be significantly low, with the Schiøtz calibration in error by as much as 3 to 5 mm Hg.…”

The relationship between intraocular pressure and glaucoma: An evolving concept

“…The probe is placed on the cornea and the pressure within the central tube increases to match the force generated by the IOP. 191 , 192 The probe is placed perpendicularly on the central cornea after anesthetization to obtain an accurate reading. Measurements can be obtained in the upright, lateral, and supine positions.…”

Tonometrie: Rückblick und Ausblick (Teil 2)

“…Pneumotonometer verwenden ebenfalls einen elektronischen Sensor zur IOD-Bestimmung und verwenden eine Messdüse, die aus einer mit Luft gefüllten Membran besteht und die Hornhaut berührt [12,13] (▶ Abb. 2).…”