PURPOSE: To investigate the correlation between the Ocular Surface Disease Index (OSDI) Questionnaire and noninvasive tear breakup times (NITBUTs) obtained by the Keratograph 4 (Oculus, Wetzlar, Germany) device. METHODS: A prospective sequential study of subjects (N = 99) unmatched for sex and without a significant difference in age by sex was performed. Testing included administration of OSDI, followed by Keratograph 4 measurements of the first NITBUT (NITBUT(f)) and average NITBUT (NITBUT(av)). RESULTS: The NITBUT(f) was significantly shorter than NITBUT(av), as tested by Mann-Whitney statistic (U = 7331.5, <0.0001). The NITBUT(f) and NITBUT(av) demonstrated identical statistically significant Spearman correlations with OSDI (r(s) = -0.20, p = 0.05). CONCLUSIONS: Ocular Surface Disease Index and NITBUT testing by Keratograph 4 device demonstrate a weak, but statistically significant, negative correlation.
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Fuller et al. (2013) studied this question.
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