This study investigates the Lacrimal Equilibration Time (LET) test, a procedure proposed in 1994 by Lavaux and Keller to aid in the diagnosis of dry eye. The test evaluates the time required for a patient to regain his or her habitual monocular distance visual acuity after the instillation of a Celluvisc lubricating drop. In this study, the LET test is compared to rose bengal staining and to a dry eye patient questionnaire. No statistically significant relationship was found between any of these variables for the 58 subjects. In addition, the LET test was found to be highly variable within subjects.
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