Establishing the Calibration Curve of a Compressive Ophthalmodynamometry Device

The relationship between externally applied force and intraocular pressure was determined using an ex-vivo porcine eye model (N=9). Eyes were indented through the sclera with a convex ophthalmodynamometry head (ODM). Intraocular pressure and ophthalmodynamometric force were simultaneously recorded to establish a calibration curve of this indenter head. A calibration coefficient of 0.140 +/- 0.009 mmHg/mN was established and was shown to be highly linear (r = 0.998 +/- 0.002). Repeat application of ODM resulted in a 0.010 +/- 0.002 mmHg/mN increase to the calibration coefficient.