Retinal oxygen tension is higher in light than dark

Einar Stefánsson

doi:10.1203/00006450-198801000-00002

Retinal oxygen tension is higher in light than dark

Einar Stefánsson^*

^*Corresponding author for this work

University of Iceland, Iceland, Landspitali - The National University Hospital of Iceland

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

The oxygen tension at the inner retinal surface in rabbits was measured with intraocular polaro-graphic 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 < 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.

Original language	English
Pages (from-to)	5-8
Number of pages	4
Journal	Pediatric Research
Volume	23
Issue number	1
DOIs	https://doi.org/10.1203/00006450-198801000-00002
Publication status	Published - Jan 1988

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title = "Retinal oxygen tension is higher in light than dark",

abstract = "The oxygen tension at the inner retinal surface in rabbits was measured with intraocular polaro-graphic 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 < 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.",

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N2 - The oxygen tension at the inner retinal surface in rabbits was measured with intraocular polaro-graphic 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 < 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.

AB - The oxygen tension at the inner retinal surface in rabbits was measured with intraocular polaro-graphic 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 < 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.

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Retinal oxygen tension is higher in light than dark

Abstract

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