Comparison of three methods of tonometry in normal subjects: Goldmann applanation tonometer, non-contact airpuff tonometer, and Tono-Pen XL

Yılmaz, İhsan; Altan, Çiğdem; Aygıt, Ebru Demet; Alagöz, Cengiz; Baz, Ökkeş; Ahmet, Sibel; Urvasizoglu, Semih; Yaşa, Dilek; Demirok, Ahmet

doi:10.2147/opth.s63915

Cited by 50 publications

(41 citation statements)

References 19 publications

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“…Non-contact tonometry has been shown to overestimate IOP relative to applanation tonometry in some studies, 26,27 while others have reported similar results between the two methods. 28,29 A number of studies have noted better intra-and interoperative reproducibility of IOP measurements with Goldman applanation tonometry and dynamic contour tonometry (DCT) compared with non-contact methods. [30][31][32] The influence of central corneal thickness and corneal curvature on IOP readings has also been reported to differ among individual measurement techniques.…”

Section: Discussionmentioning

confidence: 99%

Loteprednol Etabonate 0.5%/Tobramycin 0.3% Compared with Dexamethasone 0.1%/Tobramycin 0.3% for the Treatment of Blepharitis

Comstock¹,

DeCory²

2016

Ocular Immunology and Inflammation

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Section: Discussionmentioning

confidence: 99%

Loteprednol Etabonate 0.5%/Tobramycin 0.3% Compared with Dexamethasone 0.1%/Tobramycin 0.3% for the Treatment of Blepharitis

Comstock¹,

DeCory²

2016

Ocular Immunology and Inflammation

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“…This device is particularly useful with corneal scars or edema. 121,123,172,192 Because it is portable, it is useful in the office setting as well as during an EUA ( Fig. 5).…”

Section: Tono-pen Applanation Tonometrymentioning

confidence: 99%

Pediatric intraocular pressure measurements: Tonometers, central corneal thickness, and anesthesia

Fayed

Chen

2019

Survey of Ophthalmology

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Measuring intraocular pressure (IOP) is the cornerstone of a comprehensive glaucoma examination. In babies or small children, however, IOP measurements are problematic, cannot often be performed at the slit lamp, and sometimes require general anesthesia. Therefore, it is essential for an ophthalmologist who examines a pediatric patient to be aware of the different tonometers used in children, as well as the effects of central corneal thickness and anesthesia on IOP measurements. Goldmann applanation tonometry is the gold standard for IOP assessment. Most alternative tonometers tend to give higher IOP readings than the Goldmann applanation tonometer, and readings between different tonometers are often not interchangeable. Similar to Goldmann tonometry, many of these alternative tonometers are affected by central corneal thickness, with thicker corneas having artifactually high IOP readings and thinner corneas having artifactually lower IOP readings. Although various machines can be used to compensate for corneal factors (e.g., the dynamic contour tonometer and ocular response analyzer), it is important to be aware that certain ocular diseases can be associated with abnormal central corneal thickness values and that their IOP readings need to be interpreted accordingly. Because induction and anesthetics can affect IOP, office IOPs taken in awake patients are always the most accurate.

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“…Some research suggested that IOP NCT had good repeatability and precision. 20 This tonometer records three readings and then calculates the average value automatically.…”

Section: Noncontact Tonometermentioning

confidence: 99%

Intraocular Pressure Changes and Relationship With Corneal Biomechanics After SMILE and FS-LASIK

Wang

Dou

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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Citation: Li H, Wang Y, Dou R, et al. Intraocular pressure changes and relationship with corneal biomechanics after SMILE and FS-LASIK. Invest Ophthalmol Vis Sci. 2016;57:4180-4186. DOI:10.1167/iovs.16-19615 PURPOSE. The purpose of this article was to evaluate intraocular pressure (IOP) changes and investigate the relationship with corneal biomechanics after small-incision lenticule extraction (SMILE) and femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK). METHODS.A total of 193 eyes of 193 patients who underwent SMILE and FS-LASIK procedures were included in this retrospective study. Data were collected preoperatively and postoperatively, including Goldmann-correlated IOP (IOPg), corneal-compensated IOP (IOPcc), corneal hysteresis (CH), and corneal resistance factor (CRF) by ocular response analyzer, noncontact intraocular pressure (IOP NCT ) by noncontact tonometer, and Ehlers, Shah, Dresden, Kohlhaas, Orssengo/Pye by the Pentacam corrected system. Changes in both groups and differences between groups were evaluated. Multiple linear regression models were constructed to explore factors influencing IOP changes.RESULTS. In SMILE, the IOPg, IOPcc, IOP NCT , and Kohlhaas decreased significantly at 1 month postoperatively (P < 0.01), whereas with the Ehlers formula they significantly increased (P < 0.01). IOPs decreased at 3 and 6 months compared with all preoperative values except Ehlers values (P < 0.01), but there was no significant difference between 3 and 6 months (P > 0.05). In FS-LASIK, the IOPg, IOPcc, and IOP NCT decreased significantly at 1 month (P < 0.01), whereas in the Ehlers and Shah formulas they significantly increased (P < 0.01). Compared with preoperative values, the IOPs decreased at 3 and 6 months except in the Ehlers and Shah formulas (P < 0.01). Only IOPg and IOPcc differed between 3 and 6 months (P < 0.05). The Ehlers and Shah formulas were closer to the preoperative IOP for both groups, with variation approximately 1 mm Hg at 6 months postoperatively. Preoperative IOP, postoperative corneal resistance factor, corneal hysteresis, and flat keratometry were enrolled into the regression equations.CONCLUSIONS. IOP underestimation after SMILE or FS-LASIK was related to corneal biomechanics as well as preoperative IOP and flat keratometry. IOP after SMILE seem to remain more stable. Accordingly, the Ehlers and Shah formulas were closer to the preoperative IOP. It may be useful to estimate future IOP with the best-fit models after surgery.

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Comparison of three methods of tonometry in normal subjects: Goldmann applanation tonometer, non-contact airpuff tonometer, and Tono-Pen XL

Cited by 50 publications

References 19 publications

Loteprednol Etabonate 0.5%/Tobramycin 0.3% Compared with Dexamethasone 0.1%/Tobramycin 0.3% for the Treatment of Blepharitis

Loteprednol Etabonate 0.5%/Tobramycin 0.3% Compared with Dexamethasone 0.1%/Tobramycin 0.3% for the Treatment of Blepharitis

Pediatric intraocular pressure measurements: Tonometers, central corneal thickness, and anesthesia

Intraocular Pressure Changes and Relationship With Corneal Biomechanics After SMILE and FS-LASIK

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