Figure 1: Effects of the various drugs on the corneal epithelial barrier function. Fluorescein penetration was used as a marker for the viability of the epithelial barrier during the experiments. The corneas were exposed to eye drops containing 0.9% NaCl; 0.05% fluorescein; and 0.02% Lavasept, 0.02% Cosmocil, 0.02% chlorhexidine digluconate, or 0.01% benzalkonium chloride for 6 hours. The control corneas with intact epithelium or with mechanically removed epithelium were treated with eye drops containing 0.9% NaCl and 0.05% fluorescein