(1)objective: comparison of effect of topical ophthalmic drop tacrolimus 1% versus topical ophthalmic drop dexamethasone 1% in the treatment of patients with shield ulcer; (2)study design: Randomized, convenience sampling and dividing the patients into two groups based on the permutation blocks,double-blind for both groups of the study, controlled with medication, single-center, phase II trial; (3)study population: patients with diagnosis of shield ulcers; (4) main inclusion criteria: no history of any eye disease, eye trauma, eye surgery and lens usage, no use of concomitant other drugs, no usage of corticosteroids ten days before entering the study; (5)main exclusion criteria: simultaneous eye disease, eye trauma, surgery, smoking and steroid usage lens ten days before entering the study; (6)sample size:10 patients in each group and a total of 20; (6)interventions: administration of topical ophthalmic drop tacrolimus 1% in the first group and topical ophthalmic drop dexamethasone 1% in the second group for 3 months; (7)intervention time: at the time of diagnosis for 3 months; (8 )primary outcomes: reduced size of shield ulcer, corrected visual acuity, reepithialization.