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(Investigative Ophthalmology and Visual Science. 1973;12:140-144.)
© 1973 by The Association for Research in Vision and Ophthalmology, Inc.

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Effects of Corneal Environment on Oxygen Tension in the Anterior Chambers of Rabbits

RONALD E. BARR 1 and IAN A. SILVER 1

1 Departments of Ophthalmology and Radiology, Medical School, University of Missouri Columbia, Mo. 65201 Department of Pathology, Medical School, University Walk, University of Bristol Bristol, England

Oxygen tension in the aqueous of the anterior chamber of rabbit eyes was measured for a number of conditions at the corneal surface. The conditions were: (A) normal exposure to air with eyelids open, (B) a hard contact lens placed on the cornea, (C) a 15 µm thick piece of cellophane placed on the cornea, (D) eyelids held closed, and (E) gases--oxygen, air, and nitrogen played on the cornea. The technique employed in vivo measurements using needleshaped oxygen cathodes which were inserted into the eye from behind the limbus. The normal (Condition A) oxygen tension in the anterior chamber aqueous was 32 ± 9 mm. Hg. Oxygen tensions in the aqueous for conditions B, C, and D, and when nitrogen was played on the cornea were similar and equaled about 9 mm. Hg. Essentially no change was observed when air was played on the cornea and anterior chamber oxygen tension rose to 138 mm. Hg when oxygen was played on the cornea. The results indicate that oxygen tension levels through the cornea are dependent on environmental conditions at its anterior surface

Key Words: oxygen tension • cornea • corneal environment • oxygen cathode • aqueous humor

Submitted on July 28, 1972
Accepted on November 6, 1972






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