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Central Retinal Artery and Vein Pressure in Eyes with Chronic Open-angle Glaucoma
Brambring D., Jonas J. B.,
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 in eyes with chronic open-angle glaucoma.
Methods: The prospective clinical study included 7 eyes of patients with chronic open-angle glaucoma (age, 73.2 ± 13.0 years), and 11 normal eyes (age, 69.7 ± 17.0 years). 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 glaucoma group, the diastolic collapse pressure of the central retinal artery measured 81.3 ± 10.1 mm Hg. It was not significantly (p=0.79) different from the value in the control group (84.4 ± 19.5 mm Hg). In the central retinal vein, the diastolic collapse pressure measured in the glaucoma group 25.3 ± 15.8 mm Hg. It was significantly (p=0.03) higher than the value in the control group (11.7 ± 6.6 mm Hg).
Conclusions: As measured by a new ophthalmodynamometer with direct visualization of the central retinal vessels during the examination, the central retinal vein collapse pressure measurements is significantly higher in eyes with chronic open-angle glaucoma than in non-glaucomatous eyes. It may reflect the higher frequency of retinal vein occlusions in eyes with glaucoma. The central retinal artery collapse pressure did not differ significantly between glaucomatous eyes and non-glaucomatous eyes.