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Changes in DED severity: pain score (a), SPEED score (b) corneal staining score (c), and DEWS score (d) and an illustrative example of fluorescein staining before (e) and after (f) PKS treatment. Significant decrease in pain score, SPEED questionnaire score, and symptoms in the study group (solid lines) from baseline to 3 months (p ≤ 0.001), while remained relatively unchanged in the control group (dash lines). ∗ denotes p ≤ 0.05.
