Abstract
BackgroundThe purpose of this study is to evaluate the use of Tono-Pen XL in measuring IOP during the application of a suction ring in rabbit eyes with manometrically controlled IOP.MethodsTono-Pen XL was calibrated against direct manometry in 10 rabbit eyes. A suction ring was then applied in 4 rabbit eyes and the IOP was determined manometrically during suction ring application at 350 mmHg vacuum pressure. Finally, in 6 catheterized rabbit eyes the IOP was measured with Tono-Pen XL during suction ring application at suction vacuum from 350 to 650 mmHg, while keeping actual IOP stable at 30 mmHg and 60 mmHg.ResultsLinear regression analysis revealed that the Tono-pen XL was reliable for IOPs between 10 and 70 mmHg (R2 = 0.9855). Direct manometry during suction ring application showed no statistically significant variation of Tono-Pen XL readings when the incanulation manometry intraocular pressure changed from 30 mmHg to 60 mmHg and no statistically significant correlation between suction vacuum and IOP measurements.ConclusionTono-Pen XL measurements are unreliable during the application of a suction ring on living rabbit eyes even when the actual IOP is forced to be within the validated range of Tono-Pen XL measurements. This inaccuracy is probably related to altered corneal and scleral geometry and stress.
Highlights
The purpose of this study is to evaluate the use of Tono-Pen XL in measuring IOP during the application of a suction ring in rabbit eyes with manometrically controlled IOP
The potential complications related to the IOP increase during suction ring application raise the necessity for accurate IOP measurements during operations performed
Even if complications related to IOP elevation during suction ring application in refractive surgery are rare, they raise the necessity for more knowledge about IOP changes during such procedures [2,1,8,9,10]
Summary
The purpose of this study is to evaluate the use of Tono-Pen XL in measuring IOP during the application of a suction ring in rabbit eyes with manometrically controlled IOP. In order to achieve suction, the eye's shape needs to conform to the suction ring's shape and as a result of their application-in the general case-the sclera and the cornea are deformed. This deformation results in increased intraocular pressure and increased corneal stress. The potential complications related to the IOP increase during suction ring application raise the necessity for accurate IOP measurements during operations performed (page number not for citation purposes)
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