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  • Title: Dry eye in vitamin D deficiency: more than an incidental association.
    Author: Yildirim P, Garip Y, Karci AA, Guler T.
    Journal: Int J Rheum Dis; 2016 Jan; 19(1):49-54. PubMed ID: 26269110.
    Abstract:
    AIM: The aim of this article is two-fold: (i) to demonstrate the relation between vitamin D deficiency and dry eye and impaired tear function; and (ii) to investigate the possible associations among clinical parameters of hypovitaminosis D with dry eye parameters. METHOD: Fifty premenopausal women with vitamin D deficiency (serum vitamin D levels < 20 ng/mL) and 48 controls were included. Participants were assessed by Schirmer's test, tear break-up time test (TBUT), ocular surface disease index (OSDI), Stanford Health Assessment Questionnaire (HAQ), fatigue severity scale (FSS), and visual analogue scale-pain (VAS-pain). RESULTS: Lower scores in Schirmer's test and TBUT, and higher in OSDI were detected in patients with vitamin D deficiency than in controls (P < 0.05). FSS was negatively correlated with Schirmer's test (r = -0,29; P = 0.038) and TBUT scores (r = -0,43; P = 0.002); VAS-pain was negatively correlated with TBUT scores (r = -0.32; P = 0.023). HAQ scores showed no significant correlation with dry eye parameters (P > 0.05). Vitamin D level was negatively correlated with OSDI (r = -0.49; P < 0.001), and positively with Schirmer's test (r = 0.45; P = 0.001) and TBUT scores (r = 0.30; P = 0.029). CONCLUSION: Dry eye and impaired tear function in patients with vitamin D deficiency may indicate a protective role of vitamin D in the development of dry eye, probably by enhancing tear film parameters and reducing ocular surface inflammation. Patients with vitamin D deficiency should be evaluated for dry eye syndromes.
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