MORPHOLOGY, HISTOLOGY, AND ULTRASTRUCTURE OF HUMAN C31 ORGAN-CULTUREDCORNEAS

Our objective was to evaluate corneal structural modifications induced by corneal preservation in a C31 organ culture medium. Twenty-four po stmortem human corneas preserved in C31 medium (CRTS, Besancon, France ) for 2-21 days and 12 fresh postmortem human corneas were studied and evaluated by means of light microscopy, morphometry, and transmission electron microscopy (TEM). Endothelial cell loss during preservation averaged 9.2% (+/-7.2%). Endothelial morphology displayed significantl y more moderate alterations in the group of fresh corneas than in the group of preserved corneas. Endothelial morphometry resulted in a high er coefficient of variation (p = 0.002) in the preserved group but sho wed no difference for the average figure coefficient and average cell area. The histological study showed corneal swelling and epithelial sl oughing in the preserved group. TEM displayed moderate preservation in juries, such as numerous vacuoles, mitochondrial swelling, and increas ed cell thickness. These results are consistent with previous findings that indicated that C31 medium induces moderate preservation injuries .