Table 1.
Within-subject changes in visual acuity (Snellen best-corrected visual acuity) and the sum staining score
| Time |
Systane® Ultra (n = 46 eyes) |
Sensitive Eyes® (n = 44 eyes) |
P-value1 | ||
|---|---|---|---|---|---|
| Mean (SD) | Range | Mean (SD) | Range | ||
| Baseline | |||||
| Visual acuity | 21.20 (2.40) | 20–30 | 22.27 (3.32) | 20–30 | 0.0826 |
| Sum staining score | 0.33 (0.63) | 0–2 | 0.43 (0.76) | 0–2 | 0.4746 |
| Follow-up | |||||
| Visual acuity | 21.30 (2.46) | 20–30 | 20.57 (1.61) | 20–25 | 0.0951 |
| Sum staining score | 0.33 (0.67) | 0–3 | 0.55 (1.02) | 0–5 | 0.2342 |
Notes: P-values of Student’s t-test for between-group comparison. Per paired t-test, no statistically significant within-subject changes were detected for the Systane® Ultra group for visual acuity (P = 0.7667) or sum staining scores (P = 1.0000). For the Sensitive Eyes group, the changes in visual acuity were statistically significant (P = 0.0011, mean difference = 1.70 ± 3.22 SD), but not the sum staining score (P = 0.5413). Clinically, a change of 1.70 in visual acuity is not considered clinically relevant.