Examination of between eye retinal oxygenation saturation in the peri‐papillary region.

Purpose To measure the inter‐ocular agreement of retinal vessel oxygen saturation in the peripapillary retina of healthy individuals. Methods Twelve otherwise healthy individuals (mean age 36.5 (SD 10.5)) underwent dual wavelength retinal oximetry (ImedosSystems, Germany), non‐contact tonometry (Keeler Pulsair, UK) and manual shygomanometry in both eyes on the same day. For analyses purposes the major branches of the central retinal artery and vein crossing through a circular segment located one half disc diameter (DD) away from the optic nerve head (ONH) and 1DD in width were selected from 3 consecutively taken images. Arterial and venular oxygen saturation was then used to calculate the arterio‐venous oxygen saturation difference. Results Arterio‐venous difference of peri‐papillary retinal vessel oxygen saturation showed good inter‐ocular agreement and no dependence on age, blood pressure or intraocular pressure (Right eye 37 (7)% and left eye 38 (5) %, r=0.71). Conclusion There is good inter‐ocular agreement of peri‐papillary retinal oxygenation parameters in healthy individuals. [ABSTRACT FROM AUTHOR]