The primary outcome was the proportion of participants experiencing a ≥ 50% reduction in the combined score of the modified Oxford punctate keratopathy grading and the National Institutes of Health (NIH)/National Eye Institute (NEI) visual analogue scale in the study eye from baseline to Month 3. A ≥ 50% reduction in the combined score is considered a treatment success. While the design is a crossover study, the primary outcome was assessed after the first period at Month 3. Secondary outcomes included changes in the combined score of the modified Oxford punctate keratopathy grading and the NIH/NEI visual analogue scale in both eyes from baseline to the end of each period, changes in the chronic ocular GVHD Composite Assessment Scale (CAS) score, objective testing, subjective testing and global chronic GVHD assessments in both eyes. Safety outcomes were the number and severity of systemic and ocular toxicities and adverse events. The number of participants withdrawn from the study treatment due to vision loss, adverse events or treatment failure also contributed to the assessment of safety.