NonInvasive Break-Up Time
conjunctival redness
The tear film noninvasive break up time was measured using the Oculus Keratography Topography unit (Oculus, Inc., Arlington, WA, USA). Noninvasive break-up time measurements were made in addition to the bulbar conjunctival redness, and tear film meniscus height in each eye. All measurements were made using the manufacturer's instructions at 13 of the 27 clinical centers that had an Oculus Keratography Topography unit.