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Jeffery C. Hinson, Jr.; Comparison of Intraocular Pressure by Tonopen vs Palpation after Cataract Extraction. Invest. Ophthalmol. Vis. Sci. 2012;53(14):6671.
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© ARVO (1962-2015); The Authors (2016-present)
The purpose of this study is to demonstrate the accuracy cataract surgeons exhibit when determining intraocular pressure after performing phacoemulsification with intraocular lens implantation by comparing their estimation of pressure with direct palpation versus the use of a tonopen.
The methods performed in the study included two cataract surgeons, one attending and one senior resident, who would estimate the intraocular pressure after cataract surgery with phacoemulsification with intraocular lens implantation via direct palpation; a 30 gauge cannula, attached to a TB syringe with pressure placed on the sclera after incision sites were hydrated and found to be water tight, was used. Next, a tonopen, Reichert XI model, was calibrated and used to determine the intraocular pressure with a +-5% error. The results were recorded by an OR nurse and were not shared with the individual cataract surgeons.
Based upon the data collected, there was no signficant difference between the comparison of intraocular pressure determination between the resident estimation and tonopen measurements. There was also no statistical difference between the comparison of intraocular pressure determination between attending estimation and tonopen measurements. However, there was a statistical difference between the resident's and the attending's intraocular pressure estimations. Results were determined using a paired t-test with a p value = <.05 and a n=50.
Based upon this study, cataract surgeons are accurate in determining intraocular pressure via palpation with a 30 gauge cannula on a TB syringe when compared to the use of a tonopen.
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