To the Editor.
—Ophthalmodynamometry is mentioned in the article on cavernous sinus thrombosis by Friberg and Sogg that appeared in the March issue of the Archives (96:453-456, 1978).The report states that readings of 55/20 mm Hg and 52/20 mm Hg were obtained for the right and left eyes. The blood pressure was 112/78 mm Hg. These low readings might be due to the confusion of scale units on the ophthalmodynamometer with mm Hg. Evans et al1 have outlined the proper method of making this conversion.Furthermore, six months prior to these readings the patient had pathophysiologic central retinal artery pulsations in both eyes. Shiötz tonometry was in the range of 120 mm Hg in the right eye and 100 mm Hg in the left eye. The brachial blood pressure at the time of these observations is not reported.Stepanik has found that ophthalmic artery blood pressure in normal
Schermer M. Ophthalmodynamometry. Arch Ophthalmol. 1978;96(9):1700. doi:10.1001/archopht.1978.03910060306030