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Abstract #52370 Published in IGR 15-1
The Difference in Intraocular Pressure Readings Between 3 Applanation Tonometers is Independent of Central Corneal Thickness, in Glaucomatous and Nonglaucomatous Eyes
Baily C; Dooley I; Collins N; Hickey-Dwyer MJournal of Glaucoma 2014; 23: 620-623
PURPOSE: To look at tonometry differences between 3 tonometers and to correlate this difference with central corneal thickness (CCT) in glaucomatous and nonglaucomatous eyes. METHODS: A total of 145 patients were recruited (39 with glaucoma). Intraocular pressure (IOP) was carried out using the Tonosafe (TS), Tono-Pen XL (TP), and Goldmann applanation tonometer (GAT). CCT was also performed using a digital pachymeter. RESULTS: The TS underestimated IOP when compared with the GAT by a mean (±SD) of 1.03±2.14 mm Hg (P<0.001). The TP when compared to the GAT overestimated IOP by a mean (±SD) of +1.09±6.38 mm Hg (P=0.071). We found only 31% of TP readings to be within ±2 mm Hg of the GAT readings and only 60% to be within ±4 mm Hg of the GAT readings. Correlation was poor (F=0.247) between the GAT and TP with the coefficient of determination being 0.061. The difference in IOP was independent of CCT and a diagnosis of glaucoma. CONCLUSIONS: The TS, when compared with the GAT, underestimates IOP with a tendency for this to increase in the higher range of IOP readings. The TP is poorly correlated with the GAT.
*Department of Ophthalmology, Mid-Western Regional Hospital, Dooradoyle, Limerick †Department of Ophthalmology, Cork University Hospital, Cork, Ireland.
Full articleClassification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
2.2 Cornea (Part of: 2 Anatomical structures in glaucoma)
