Comparison of the Tono-Pen to the Goldmann Applanation Tonometer

Frenkel, Ronald E. P.; Hong, Young Jae; Shin, Dong Ho

doi:10.1001/archopht.1988.01060130820030

Cited by 152 publications

(82 citation statements)

References 9 publications

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“…The Tono-Pen XL ® tonometer has been used for more than 3 decades, and although it is the most popular tonometer in veterinary medicine, its accuracy has always been questioned in human medicine (FRENKEL et al, 1988;IESTER et al, 2001;ANDRADA MÁRQUES et al, 2003;KALESNYKAS & UUSITALO, 2007). In addition, its high cost has restricted its use to specialized veterinary ophthalmology centers.…”

Section: Discussionsupporting

confidence: 41%

Intraocular pressure measurements with the Tono-Pen XL® and Perkins® applanation tonometers in horses and cattle

et al. 2013

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Section: Discussionsupporting

confidence: 41%

Intraocular pressure measurements with the Tono-Pen XL® and Perkins® applanation tonometers in horses and cattle

et al. 2013

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“…A raised IOP in upgaze should alert the examiner of likely muscle restriction, rather than using subjective forced duction testing. 33,35 We had no direct surgical complications in this study, although we did observe persistent new-onset diplopia at 6 months post decompression in 2 (6.1%) patients, which is similar to other reports. [36][37][38][39][40] This audit was of a prospective design but not blinded and this should be recognised, along with the limitations that this carries.…”

Section: Discussionmentioning

confidence: 46%

The effect of orbital decompression surgery on refraction and intraocular pressure in patients with thyroid orbitopathy

Norris

Ross

Kazim

et al. 2012

Eye

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Purpose To investigate the effect of orbital decompression surgery in thyroid orbitopathy (TO) on both refractive status and intraocular pressure (IOP). Patients and methods A prospective, multicentre, consecutive audit of patients undergoing thyroid decompression surgery. Indications for surgery included cosmetically unacceptable proptosis or corneal exposure. Exclusion criteria included the following: previous orbital surgery, glaucoma, corneal disease, steroid use in the preceding 12 months, or an acute optic neuropathy. Automated refraction, keratometry, pachymetry, Hertel exophthalmometry, and IOP were recorded at 1 month pre-and 3 months postoperatively. IOP using the Tono-Pen (mean of three readings) was measured in the primary, upgaze, and downgaze positions. Results Data were collected from 52 orbits of 33 patients (East Grinstead, New York, and Adelaide). There was no significant difference between pre-and postoperative data for sphere, cylinder, or central corneal thickness (CCT). The mean spherical equivalent was À0.43±1.49 D pre-operatively and À0.28±1.52 D postoperatively. The steepest meridian of corneal curvature was 93.1 degrees pre-and 94.2 degrees postoperatively, with no significant difference. Mean IOP significantly decreased when measuring by Goldmann applanation tonometry (GAT) (2.28 mm Hg, *P ¼ 0.001) and Tono-Pen (3.06 mm Hg, *P ¼ o0.0001). IOP measured in upgaze was significantly greater than that in the primary position. Regression analysis between change in IOP and either Hertel exophthalmometry or the number of orbital walls decompressed was non-significant (*Student's t-test). Conclusion Patients with TO undergoing orbital decompression had, on average, with-the-rule astigmatism not affected by orbital decompression surgery. IOP was significantly reduced by decompression surgery although no relationship between IOP and the degree of decompression was observed.

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“…After penetrating keratoplasty, Viestenz found that DCT yielded reproducible IOP values that were higher in comparison to those for GAT, and were disturbed by postoperative intrastromal sutures [19]. The Tono-Pen ® XL (TP) is a handheld tonometer operating on the same principle as the Mackay-Marg tonometer [12]. The accuracy of the TP is still a matter of discussion.…”

Section: Discussionsupporting

confidence: 42%

“…The Tono-Pen ® XL (TP; the way it works has been detailed elsewhere [12]) performs four independent IOP readings and provides a reliability index for each single measurement. Measurements were only used if the scatter index was below 5%.…”

Section: Methodsmentioning

confidence: 43%

Dynamic Contour Tonometry, Tono-Pen XL<sup>®</sup>, and Goldmann Applanation Tonometry in Comparison to Intracameral Intraocular Pressure (IOP) Measurements in Patients with Corneal Pathologies

Neuburger¹,

Grosswendt²,

Lautebach³

et al. 2014

OJOph

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Purpose: The accuracy of Goldmann applanation tonometry (GAT) has been shown to depend on several biomechanical properties of the cornea. Newer tonometry devices (e.g., the Dynamic Contour Tonometer PASCAL ® [DCT] and the Tono-Pen ® XL [TP]) have been designed to accurately measure intraocular pressure (IOP) independent of corneal thickness (CCT) and pathology. This study investigates the influence of corneal pathologies on the accuracy of these IOP measuring devices, and compares this accuracy to that of direct intracameral IOP measurement. Methods: 8 eyes of 8 patients suffering from corneal pathologies scheduled for penetrating keratoplasty, and 10 eyes of 10 patients scheduled for cataract surgery (control group) were examined. Before surgery, the anterior chamber was cannulated at the temporal corneal limbus. In a closed system, the intraocular pressure (IOP) was directly set to 10, 20, and 30 mmHg with a manometric water column. Intraocular pressure measurements taken by GAT, DCT, and TP were compared to intracameral measurements obtained by a precision reference pressure sensor. Results: Control group: All three methods showed good agreement with the intracameral readings (mean deviation of all three devices, −0.9 mmHg). Group with corneal pathologies: The TP yielded the most exact IOP values in the group with corneal pathologies when taking all diagnoses into account. The mean deviations from the intracameral IOP measurements were −0.9 mmHg ± 3.2 mmHg (mean ± SD) for TP, −2.9 mmHg ± 3.3 mmHg for GAT, and −5.0 mmHg ± 7.9 mmHg for DCT. For bullous keratopathy, the most exact IOP readings were obtained by the TP (mean deviation −0.2 mmHg ± 3.5

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Comparison of the Tono-Pen to the Goldmann Applanation Tonometer

Cited by 152 publications

References 9 publications

Intraocular pressure measurements with the Tono-Pen XL® and Perkins® applanation tonometers in horses and cattle

Intraocular pressure measurements with the Tono-Pen XL® and Perkins® applanation tonometers in horses and cattle

The effect of orbital decompression surgery on refraction and intraocular pressure in patients with thyroid orbitopathy

Dynamic Contour Tonometry, Tono-Pen XL<sup>®</sup>, and Goldmann Applanation Tonometry in Comparison to Intracameral Intraocular Pressure (IOP) Measurements in Patients with Corneal Pathologies

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Comparison of the Tono-Pen to the Goldmann Applanation Tonometer

Cited by 152 publications

References 9 publications

Intraocular pressure measurements with the Tono-Pen XL® and Perkins® applanation tonometers in horses and cattle

Intraocular pressure measurements with the Tono-Pen XL® and Perkins® applanation tonometers in horses and cattle

The effect of orbital decompression surgery on refraction and intraocular pressure in patients with thyroid orbitopathy

Dynamic Contour Tonometry, Tono-Pen XL&lt;sup&gt;&#174;&lt;/sup&gt;, and Goldmann Applanation Tonometry in Comparison to Intracameral Intraocular Pressure (IOP) Measurements in Patients with Corneal Pathologies

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Dynamic Contour Tonometry, Tono-Pen XL<sup>®</sup>, and Goldmann Applanation Tonometry in Comparison to Intracameral Intraocular Pressure (IOP) Measurements in Patients with Corneal Pathologies