Figure 2From: Evaluation of the cytotoxic effects of ophthalmic solutions containing benzalkonium chloride on corneal epithelium using an organotypic 3-D model The effects of the ophthalmic solutions on 3-D human corneal epithelial cell viability reported as mean percent (± standard deviation) of saline control. Methanol (70%) and saponin (5%) were positive controls and saline was a negative control. *p < 0.05 versus saline control. †p < 0.05 versus travoprost.Back to article page