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Relationship between subbasal nerve fiber bundle density and time after penetrating keratoplasty (PK). Cross-sectional analysis of 94 clear penetrating grafts suggested that subbasal nerve fiber bundle density increased with time after PK (r = 0.36, P < .001). The increase was not clinically significant because density remained decreased compared to subbasal nerve density in normal corneas (median, 7,025 μm/mm2, n = 76).
