Stefánsson E
Duke University Medical Center, Department of Ophthalmology, Durham, North Carolina 27710.
Pediatr Res. 1988 Jan;23(1):5-8. doi: 10.1203/00006450-198801000-00002.
The oxygen tension at the inner retinal surface in rabbits was measured with intraocular polarographic electrodes. In the air breathing rabbit, the oxygen tension is 21 +/- 9 mm Hg (mean +/- 1 SD, n = 6) in 12 foot-candles white light at the cornea. The oxygen tension falls 6 +/- 2 mm Hg (mean +/- 1 SD, n = 4, p less than 0.02) in darkness. In bright white light (800 foot-candles), the retinal oxygen tension is about 6 mm Hg higher than at 12 foot-candles. The in vivo retinal oxygen consumption was calculated to be 2.4 ml O2/100 g/min in light and 2.6 ml O2/100 g/min in dark. The higher oxygen consumption is probably responsible for the lower oxygen tension of the retina in dark as compared to light. Breathing 100% oxygen elevates the preretinal oxygen tension to 190 +/- 72 mm Hg (mean +/- 1 SD, n = 4) in light.
用眼内极谱电极测量家兔视网膜内表面的氧张力。在空气呼吸的家兔中，角膜处12英尺烛光白光下的氧张力为21±9毫米汞柱（平均值±1标准差，n = 6）。在黑暗中，氧张力下降6±2毫米汞柱（平均值±1标准差，n = 4，p＜0.02）。在强光（800英尺烛光）下，视网膜氧张力比12英尺烛光时高约6毫米汞柱。计算得出活体视网膜在光照下的氧消耗量为2.4毫升O₂/100克/分钟，在黑暗中为2.6毫升O₂/100克/分钟。与光照相比，较高的氧消耗量可能是黑暗中视网膜氧张力较低的原因。吸入100%氧气可使光照下视网膜前氧张力升高至190±72毫米汞柱（平均值±1标准差，n = 4）。
