On Visit IB, subjects will have VA and biomicroscopy performed. A basal tear sample of approximately 5 µL will be collected via capillary tubes from the outer canthus of each eye and stored on dry ice then placed in a -80c ± 10°C freezer for storage. Photographic assessments of the ocular surface may be taken. After waiting 5 minutes for the tear film to stabilize, tear osmolarity may be measured in each eye.