CORNEAL SENSITIVITY IN A PREVIOUSLY DIAGNOSED MILD DRY EYE DISEASE POPULATION COMPARED TO NON-DRY EYE CONTROLS

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Scott Hauswirth
Alexandra S. Homann
Whitney Hauser
Scott Schachter

Abstract

Background and Objective
To identify whether a measurable difference in corneal sensitivity exists between patients previously diagnosed with mild dry eye disease and non-dry eye controls using a novel in-office esthesiometry kit.


Material and Methods
This was a consecutive, single-visit, single-center, comparative observational study. Forty patients (20 dry eye patients and 20 non-dry eye controls) were screened for study inclusion. Thirty-six were included in the analysis set (17 dry eye, 19 non-dry eye). Patients completed a dry eye symptom questionnaire (OSDI), tear film break-up time (TBUT) evaluation, Schirmer’s I test, and vital dye staining for corneal and conjunctival integrity, and corneal sensitivity measurements in the central and inferior cornea.


Results
Comparison between the two groups revealed statistically significant differences in age, TBUT, conjuncti-val and corneal staining scores, and central corneal and inferior corneal sensitivity. There were no differ-ences in OSDI score and Schirmer’s I score between the two groups. Corneal staining score was inversely correlated with a decrease in central (−0.78) and inferior (−0.77) corneal sensitivity. Corneal sensitivity measurements were more strongly correlated to corneal staining score than age (−0.58; z = −2.20).


Conclusion
Patients with a previous diagnosis of mild dry eye disease exhibited higher corneal and conjunctival staining scores, which correlated with reduced corneal sensitivity in both central and inferior regions compared to non-dry eye controls. A stronger correlation existed between reduced sensitivity to corneal staining and age in this study. This demonstrates a decrease in the neurosensory function in the presence of reduced

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