A new instrument to measure episcleral venous pressure was described. The episcleral venous pressure of human eyes was measured by determining the pressure necessary to arrest blood flow with a modified force-displacement transducer. The mean episcleral venous pressure of 39 normal eyes was 9.0 ±1.4 mm Hg (standard deviation) and of 27 eyes with primary open-angle glaucoma was 8.6 ± 1.4 mm Hg. There was no significant difference between these values. The results were compared to those in the literature.
Podos SM, Minas TF, Macri FJ. A New Instrument to Measure Episcleral Venous PressureComparison of Normal Eyes and Eyes With Primary Open-Angle Glaucoma. Arch Ophthalmol. 1968;80(2):209-213. doi:10.1001/archopht.1968.00980050211011