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To determine the possible association between serum vitamin D levels and dry eye symptoms, and the impact of an oral vitamin D supplement.Three linked studies were performed. (i) 29 older adult participants, (ii) 29 dry eyed participants, and (iii) 2-month vitamin D supplementation for 32 dry eyed/low serum vitamin D levelled participants. All participants were assessed by the Ocular Surface Diseases...
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