KeratoScoop (Rebecca's blog)

Hm.

The stated purpose of this study is to compare unpreserved artificial tears to artificial tears preserved with Purite (one of the so-called dissipating or "preservative-free in the eye" preservatives). They induce epithelial defects in mice and then compare treating them with Hylo Comod (an unpreserved sodium hyaluronate drop) vs Optive (the version preserved with Purite).

Both drops did their job as regards healing but the Optive caused superficial "stippling" ...