Differences in Corneal Structure and Function in Patients With Sjogrens vs. Non-Sjogrens Dry Eye

Inclusion Criteria: * Male or female aged 18 or older * Capacity to give informed consent * Self-reported literacy * Best corrected visual acuity at distance 20/40 in each eye * Signed Institutional Review Board (IRB)-approved consent agreeing to the terms of the study For Sjogren's-related dry eye, the below inclusion criteria will be required * a previous diagnosis of dry eye made by an eye care specialist * a previous diagnosis of Sjogren's made according to the 2016 revised Sjogren's classification criteria Exclusion Criteria: * ● Age less than 18 years * Physical or mental issues, illiteracy, or language problems that might possibly interfere with reading ability or other condition that would preclude successful participation in this study * Contact lens wear within 10 days of enrollment * Any intraocular surgery (including cataract surgery) within the last 3 months * Any minor ocular surgery including tear duct cauterization or plugs within the last 30 days * Any history of corneal surgery (including LASIK/PRK) or cosmetic lid surgery in the past 12 months * Any history of glaucoma surgery (e.g., trabeculectomy or a tube shunt) * Best corrected vision worse than 20/40 * Known history of severe ocular surface disease that might cause corneal haze and interfere with corneal staining score including but not limited to graft-versus-host disease, mucous membrane pemphigoid, atopic keratoconjunctivitis * Presence of keratoconus * Concurrent epithe…