Patients with persistent corneal epithelial defects who have not responded to conventional therapy will be randomized to treatment with either amniotic membrane transplantation or autologous serum 20%. Outcome measures will be (1) presence or absence of complete re-epithelialization within 28 days and (2) retention of intact epithelium for at least 90 days.
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Corneal re-epithelialization (= initial success)
Persistent corneal re-epithelialization (= lasting success)