Hypothesis: The trial will demonstrate whether a new technique, transplantation of LSCs expanded from limbal tissue of the uninjured eye, can improve the visual function of patients with unilateral corneal ocular surface disease. In addition, it will show whether there is more rapid recovery and improved visual outcomes following PRK if expanded LSCs are used to cover the cornea. The study will also compare the incidence of complications and characterize visual outcomes in patients treated with the new technique versus the control technique.