Conjunctival impression cytology and tear-film changes in cases with vitamin D deficiency

Purpose To evaluate conjunctival surface cells and tear-film functions in cases with vitamin D deficiency. Methods Thirty-six patients with serum vitamin D deficiency and 27 control subjects with normal serum vitamin D levels were included in this prospective study. The tear break-up time (TBUT), Schirmer II test, and conjunctival impression cytology tests were performed to all participants. Results The mean serum vitamin D levels were 10.5 ± 5.0 µl in the study group and 33.9 ± 11.7 µl in the control group ( p