Pneumotonometry measurements in a patient with a right dural CCF reveal an ocular pulse amplitude of 6 mm Hg OD compared with 2 mm Hg OS. The difference in ocular pulse amplitude between the two eyes is 4 mm Hg, supporting the diagnosis of a CCF. | Henderson, A., Miller, N. Carotid-cavernous fistula: current concepts in aetiology, investigation, and management. Eye 32, 164–172 (2018). https://doi.org/10.1038/eye.2017.240

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