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—During the time the intraocular pressure was 120 mm Hg in the right eye and 100 mm Hg in the left eye, the blood pressure was recorded as 132/74 mm Hg. A predicted value for retinal artery systolic pressure would be approximately 110 mm Hg. Considering Schiötz tonometry has some inherent inaccuracy at very low scale readings and high intraocular pressures, we find no real discrepancy in the data reported.Six months after the insult, ophthalmodynamometry was performed by two separate observers with a Bailliart instrument. The direct scale readings were converted to mm Hg using the instrument calibration curve after selecting the appropriate isopter.As Dr Schermer points out, these readings are remarkably low and are inconsistent with the assumed systolic retinal artery pressure during the acute stages. However, the carotid arteriography was obtained four days after the peak intraocular pressures. We speculate that the substantial narrowing
Friberg TR, Sogg R. Ophthalmodynamometry-Reply. Arch Ophthalmol. 1978;96(9):1700. doi:10.1001/archopht.1978.03910060306031