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Efstathios T Detorakis, Spiros Fradelos, Aliki Limnopoulou; Scleral rebound tonometry in glaucomatous and non-glaucomatous eyes. Invest. Ophthalmol. Vis. Sci. 2016;57(12):6437.
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© ARVO (1962-2015); The Authors (2016-present)
Current tonometric methodologies, such as the Goldmann applanation tonometry (GAT), may not provide accurate readings in cases with extensive corneal scarring or conjunctivalization of the corneal surface as well as following corneal refractive surgery. This study examines the feasibility of scleral rebound tonometry (SRT) with the iCare rebound tonometer (Finland Oy, Espoo, Finland) as an alternative method of assessing the intraocular pressure (IOP).
SRT was performed on the right eye of 40 glaucomatous patients (14 males), aged (mean±SD) 73.55±15.3years and 40 non-glaucomatous patients (20 males), aged 68.55±8.3years. Patients were consecutively recruited from the Department of Ophthalmology of Tzaneion General Hospital in Piraeus, Greece. Patients with previous ocular trauma of surgery were excluded. SRT was performed as per manufacturer instructions at the inferior-temporal scleral quadrant. Correlations of findings with Axial Length (AXL), central corneal thickness (CCT), GAT and corneal rebound tonometry (CRT), the latter also performed with the iCare, were examined with Pearson’s bivariate correlation coefficient (r) using SPSS 8.0 (SPSS Inc. Chicago, IL, USA).
SRT was significantly correlated with GAT (r= 0.366, p = 0.02) in non-glaucomatous eyes. The respective correlation in glaucomatous eyes was statistically not significant. Correlations between SRT and other parameters examined were also statistically not significant.
SRT may prove to be a valid alternative tonometric method, although parameters affecting its accuracy should be further examined. The lack of a statistically significant correlation between SRT and GAT in glaucomatous eyes may reflect alterations in scleral rigidity due to the use of anti-glaucomatous medications, such as prostaglandin analogues.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
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