Patients with either suspected or confirmed diagnosis of Sjogren's disease will be recruited to participate. Participation will involve the completion of a brief survey (the OSDI), corneal evaluation with an aesthesiometer, corneal staining with fluorescein and lissamine green, and finally measurement of tear-film breakup time. In addition, participants will have their corneal nerve morphology evaluated with the Heidelberg confocal microscope and finally they will have a blood draw performed to assess vitamin D level.