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XLM, A. and A. BILL. The oxygen suppb to the retina, II. Efects of high intraocular pressure and of increased arterial carbon dioxide tension on uueal and retinal bloodfZow in cats. A study with radioactiueEq' labelled microspheres including flow determinations in brain avid some other tissues. Acta physiol. scand. 1972. 84. 306-319. 1. 5 p and 35 p microspheres labelled with aSSr and 169Yb were used to determine the rate of blood Row through various intraocular tissues, optic nerve, brain, kidney cortex and small intestine in cats at normal and increased P,co,. One eye had its spontaneous intraocular pressure, the other eye had its pressure stabilized at a higher level. At normal Pacer a reduction in perfusion pressure rrsulted in decreased vascular resistance in the iris, the ciliary body and the retina, but not in the choroid. In the retina the eye with reduced perfusion pressure had a significantly higher blood flow than the control eye. Increased Pace, resulted in increased blood flow in all ocular tissues and all rxtraocular tissues studied except thr kidney cortex. Reductions in perfusion pressure at high