The effects of 100% oxygen and 10% carbon dioxide on the choroidal circulation were studied by the radioactive krypton desaturation technique in anesthetized cats. One hundred percent oxygen caused an increase in choroidal vascular resistance (CVR) and a decrease in mean arterial pressure (MAP), both of which resulted in a slight decrease in choroidal blood flow (CBF). Ten percent carbon dioxide caused a marked decrease in CVR, a variable change in MAP, with a new increase in CBF.
Friedman E, Chandra SR. Choroidal Blood FlowIII. Effects of Oxygen and Carbon Dioxide. Arch Ophthalmol. 1972;87(1):70-71. doi:10.1001/archopht.1972.01000020072015