Axial Length and IOP Changes With Application of the IntraLase and Moria M2 Suction Rings

Abstract

Abstract: : Purpose: To determine how the axial length and the intraocular pressure changes when the IntraLase suction ring interface and the Moria M2 suction ring are placed on the human eye. Methods: Ten fresh human cadaver eyes (five pairs) and six eyes (three pairs) of living volunteers were studied. Intraocular pressures and axial lengths were obtained both prior to and during application of an IntraLase suction ring to one of a pair of the eyes. Similar measurements were obtained with application of a Moria M2 suction ring. Results: Intraocular pressures increased with both suction rings to between 71 to 84 mmHg during application of suction in both living and cadaver eyes. Axial lengths either remained unchanged or shortened during suction application in both IntraLase and Moria M2 cadaver or living human eyes. The average decrease in axial lengths was 0.47mm for IntraLase cadaver eyes and 82mm for Moria cadaver eyes. In three pairs of living volunteer eyes the axial length shortened on the average of 0.19mm for IntraLase eyes and 0.12mm for Moria M2 eyes. Conclusions: The intraocular pressure is raised significantly when either the IntraLase or the Moria M2 suction ring is applied to the human eye. Contrary to recent reports of elongation of axial length with the Moria M2 suction ring (Flaxel et al, Ophth 111:24–27;2004), we found that the axial length decreases (instead of increases) when either type of suction ring is applied to living or cadaver human eyes.

Keywords: anterior chamber • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • refractive surgery: LASIK