Ocular surface disease, especially dry eye and scleritis, commonly affects patients with autoimmune diseases. Ocular surface immune cells are increased in autoimmune disease; however the full subset of immune cells activated is unknown. Recent experimental studies show that dendritic cells and T cells in the cornea are critically associated with corneal nerve innervation. Corneal confocal microscopy (CCM) allows rapid non-invasive in vivo imaging of dendritic cells and corneal nerves. The investigators propose to investigate how ocular surface health, conjunctival immune cells and corneal nerve/dendritic cell morphology interact in 3 rheumatological conditions: Sjogren's syndrome (SS), Rheumatoid arthritis (RA), Systemic lupus erythematosus (SLE).