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(Investigative Ophthalmology and Visual Science. 1968;7:34-43.)
© 1968 by The Association for Research in Vision and Ophthalmology, Inc.

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Permeability of the Corneal Endothelium to Nonelectrolytes

SAIICHI MISHIMA 1 and STERLING M. TRENBERTH 1

1 Department of Ophthalmology, College of Physicians and Surgeons, Columbia University New York, N.Y.

The endothelial surface of the isolated rabbit cornea was perfused with modified KEI medium, according to the method reported previously. This in vitro cornea maintained its thickness within the normal range even after the epithelium was removed. The endothelial permeability of these in vitro corneas to tritiated water, 14C-labeled urea, sucrose, and inulin was determined. The reflection coefficients of the endothelium calculated according to the physical interpretation of Kedem and Katchalsky were in fair agreement with those determined previously from osmotic fluid flow across the endothelium. Perfusion of the corneal endothelium with calciumfree KEI medium resulted in a corneal swelling with an increased endothelial permeability. Perfusion with KEI medium containing ouabain (10-3and 10-5 moles per liter) induced a corneal swelling with normal endothelial permeability.

Note:

United States Public Health Service Ophthalmology Training Grant 5 TI NB 05164 from the National Institute of Neurological Diseases and Blindness. Present address: Jules Stein Eye Institute, UCLA Center for the Health Sciences, Los Angeles, Calif.






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