The SANDE uses a 100 mm visual analog scale (VAS) and asks the subject to score frequency and severity of their ocular discomfort over the past 24 hours by putting a vertical mark on two separate horizontal scoring lines. The frequency scoring line utilizes the anchors of 'Rarely' to 'All the Time', while the severity scoring line utilizes the anchors of 'Very Mildly' to 'Very Severely uncomfortable'. The SANDE questionnaire was completed through an electronic diary by the subject at the Screening Visit(s) of Part 1, and thereafter every evening before bedtime during the study. The overall SANDE score was calculated by taking the square root of the product of the frequency of symptoms score and the severity of symptoms score. The SANDE scale ranged from 0 to 100 with 100 being the maximal amount of dry eye symptoms and 0 being the minimal amount of dry eye symptoms. Negative change from baseline indicates improvement.

The degree of staining was based on the Corneal Fluorescein Modified NEI Scale. Each of the five regions (central (C), superior (S), inferior (I), temporal (T), and nasal (N)) were graded based on a scale of 0 to 4, with higher scores suggestive of higher degrees of corneal staining. After entry of the scores per region, the total or composite (sum) score for each eye was automatically calculated (maximum score = 20/eye). A (+1) was added to the sum score for any eye with the presence of filaments.