Polimorphonuclear count at the center and periphery of corneas at day 7 after alkali-injury treated with PF-MC, SLPI or Buffer. A: Microscopic picture (40X). Black arrow indicates a PMN cell. B: Column chart of number of PMN in a 40X visual field at the center plus a field at the periphery. C: Statistic table of the PMN count at the center and periphery. D: Statistic table of PMN count at the center and periphery excluding the cases with stromal abscess.