Eye dryness score was scored on a Visual Analogue Scale (VAS) ranges from 0-100 (0=no discomfort; 100=maximal discomfort).

Corneal staining was performed to grade the degree of corneal epithelial cell injury as measured by fluorescence using slit-lamp examination. The corneal surface is divided into three regions: superior, central and inferior. The scores for each of these 3 regions ranged from 0 to 4 (0=no staining; 1=few/rare punctate lesions; 2=discrete and countable lesions; 3=lesions too numerous to count, but not coalescent; 4=coalescent) with 0.5 point increments, and lower scores indicate improvement. Inferior corneal fluorescein staining scores from the study eye only were reported. Study eye is the 'worse eye', defined as the eye with worse (higher) score at baseline.

Eye dryness score was assessed on a visual analogue scale (a 7-item \[burning/stinging, itching, foreign body sensation, eye discomfort, eye dryness, photophobia, and pain\], participant-reported, symptom index) with scores ranging from 0 to 100 (0=no discomfort; 100=maximal discomfort) and lower scores indicate a better outcome.