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Ophthalmo-dynamometric Assessment of the Central Retinal Artery and Vein Blood Pressure in Normal Eyes
Libera T.,
Ruprecht-Karls-Universität Heidelberg, Fakultät für klinische Medizin Mannheim, Augenklinik (Mannheim)
Purpose: Using a new Goldmann lens associated ophthalmodynamometric device, it was the purpose of the present study was to determine the central retinal vessel collapse pressure as indirect measure of the blood pressure in the central retinal artery and vein of normal eyes.
Method: The prospective clinical study included 14 normal eyes (5 right eyes; age: 69.4 ± 15.8 years) which were examined due to cataract or refractive problems. With topical anesthesia, a Goldmann contact lens fitted with a pressure sensor was put onto the cornea. Pressure was asserted onto the globe by pressing the contact lens, and the pressure value at the time when the central retinal artery and vein started pulsating or showed stop of perfusion were noted. Additionally, we measured the brachial blood pressure.
Results: In the central retinal artery, diastolic collapse pressure measured 80.9 ± 20.0 mm Hg. It was significantly correlated with the diastolic blood pressure (correlation coefficient r=0.89; p=0.001) and the systolic arterial blood pressure (r=0,84; r=0.005). It was statistically independent of age (r=0.85). In the central retinal vein, diastolic collapse pressure measured 11.8 ± 5.9 mm Hg. It was significantly correlated with the systolic arterial blood pressure (r=0.85; p=0.03) and the central retinal artery collapse pressure (r=0.74; p=0.009). It was statistically independent of age (p=0.53).
Conclusions: As measured by a new ophthalmodynamometer with direct visualization of the central retinal vessels during the examination, the central retinal artery and vein collapse pressure measurements are closely related with each other and with arterial blood pressure measurements in normal subjects.