“…Several authors have already claimed that the release of a collagenolytic enzyme from damaged epithelial cells is of considerable importance in the pathogenesis of corneal stromal ulceration (Slansky, Freeman and Itoi, 1968;Brown, Akiya and Weller, 1969;Itoi et al, 1969;Slansky et al, 1969). Brown et al have shown that the corneal ulcers and perforations, which inevitably occur with severe alkali burns, can be prevented by the use of collagenase inhibitors, and that though some degree of neovascularisation occurred in the cornea of control animals there was none in the inhibitor-treated corneas.…”