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Nicola Ungaro, Giovan Battista Scazzi, Maria Francesca Giacosa, Maria Grazia Tardini, Giacomo Bacchi, Stefano Gandolfi; INTRAOCULAR PRESSURE CHANGES BY CONTINOUS RECORDING THROUGH TRIGGERFISH CONTACT LENS APPLICATION IN PATIENTS UNDERGOING WATER DRINKING TEST: CORRELATION WITH GOLDMANN READINGS IN CONTROLATERAL EYE. Invest. Ophthalmol. Vis. Sci. 2013;54(15):5653.
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To evaluate the changes of intraocular pressure (IOP) through Triggerfish contact lenses (LAC) after water drinking test (WDT) and their correlations with IOP changes recorded with Goldmann Tonometry (GAT)
Retrospective analysis of ten healthy glaucoma suspect subjects. First, The IOP was recorded in both eyes with standard GAT, then the Triggerfish LAC, which is able to measure changes in corneal curvature that are related to IOP, was applied into a random eye. Hereinafter was administred the WDT: 10 mL/kg of water in 5 min. After 15 min we started to measure IOP with GAT in the fellow eye, every 15 min for 90 min, while LAC recorded data every 5 min during all this period of time; the changes in IOP were compared to baseline recorded before the WDT. Similarly the records obtained in the two eyes with the two methods were compared with each other
Data are shown in Table 1. The t test analysis of changes in IOP recorded with GAT was significant in four points compared to baseline (tab. 1). IOP changes measured with LAC were significant in two points compared to baseline (tab. 1). The comparison of the pressure recordings obtained with the two methods was carried out with the Pearson coefficient. To reduce the individual variability was considered the mean of values measured from both the Goldmann and the Triggerfish in all the timepoints of the curve. It was found a good correlation between the two methods (P = 0989)
Both methods showed a significant change in IOP after the WDT. The analysis of the means of values in all timepoints of the two instruments showed a good correlation proving that there is a relationship between the changes in IOP measured by Goldmann and changes in corneal curvature measured by Triggerfish LAC. Further studies are needed to eventually establish an algorithm that exactly correlates the corneal curvature changes recorded with Triggerfish LAC with IOP changes measured with GAT
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