2008
DOI: 10.3921/joptom.2008.59
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Accuracy of Schiotz Tonometry in Measuring the Intraocular Pressure After Corneal Refractive Surgery

Abstract: PURPOSE:To test the accuracy of Schiotz tonometry (ST) in patients that underwent photorefractive keratectomy (PRK). METHODS: 175 eyes previously treated with PRK for myopia, myopic astigmatism or mixed astigmatism, with a mean preoperative spherical equivalent (SE) of -4.27±2.83 diopters (range: -13 to -0.25 diopters), had their intraocular pressure (IOP) measured, at least 3 months after PRK, with Goldmann applanation tonometry (GAT) and ST with both 5.5-g and 10-g load and also utilizing the Friedenwald nom… Show more

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Cited by 8 publications
(6 citation statements)
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“…28,29 Schioetz tonometry is known to be more dependent on biomechanical factors, such as ocular rigidity, 15,30 suffers from a high variability even in normal corneas, and can give false high IOP values in eyes with corneal scars, PK, or after superficial keratectomy. 28,[31][32][33] Grant 34 showed that glaucomatous eyes typically have a reduced trabecular meshwork outflow facility and this was confirmed for eyes after PK too. 35,36 After DSEK we did at no time measure a pathologic outflow facility (C-value).…”
Section: Discussionmentioning
confidence: 77%
“…28,29 Schioetz tonometry is known to be more dependent on biomechanical factors, such as ocular rigidity, 15,30 suffers from a high variability even in normal corneas, and can give false high IOP values in eyes with corneal scars, PK, or after superficial keratectomy. 28,[31][32][33] Grant 34 showed that glaucomatous eyes typically have a reduced trabecular meshwork outflow facility and this was confirmed for eyes after PK too. 35,36 After DSEK we did at no time measure a pathologic outflow facility (C-value).…”
Section: Discussionmentioning
confidence: 77%
“…Basically, the result of both theirs [1] and our paper [2] is similar, i.e., Schiotz indentation tonometry (ST) is less affected by previous surface ablation when evaluating the IOP than Goldmann tonometry (GAT).…”
mentioning
confidence: 60%
“…Another major difference between the paper by Rosa et al [1] and ours [2] is that we did include normal eyes that were evaluated by the same examiner and using the same three tonometers that were used in the operated eyes, while Rosa et al only performed GAT tonometry in the preoperative exam. By doing so, they have missed the chance to compare GAT and ST readings in normal, unoperated corneas.…”
mentioning
confidence: 99%
“…8,9 These methods have disadvantages similar to those for the GAT and show a higher measurement uncertainty than the GAT. 8,9 The iCare rebound tonometer (iCare Finland Oy, Vantaa, Finland), which shoots a small plastic-covered metal pin onto the cornea from a short distance and measures the rebound velocity, is also contact based but does not require an anesthetic. The measurement uncertainty is higher in comparison to the GAT, with a confidence interval of ±6.6 mm Hg (k p = 2) within the physiological normal pressure range.…”
Section: Introductionmentioning
confidence: 99%