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Differences in dry eye signs and symptoms between the following groups: healthy control (N=9), DM with mild/no DPN (N=16) and DM with severe DPN (N=9) in A: Mean tear osmolarity (p=0.007); B: Mean corneal nerve fiber length (p=0.004); C: Mean Schirmer's test values (p=0.019); D: Mean total OSDI score (p=0.260). Abbreviations: DPN, Diabetic Peripheral Neuropathy; DM, Diabetes Mellitus; OSDI, Ocular Surface Disease Index.
