Age 18 years or older

Ability to provide written informed consent

For rheumatologic patients: Confirmed clinical diagnosis of one of the following autoimmune diseases:

Rheumatoid Arthritis (2010 ACR/EULAR classification criteria)

Systemic Lupus Erythematosus (2019 EULAR/ACR classification criteria)

Sjogren's Syndrome (2016 ACR/EULAR classification criteria)

Ankylosing Spondylitis (modified New York criteria)

Psoriatic Arthritis (CASPAR criteria)

For healthy controls: Age- and sex-matched individuals with no systemic autoimmune disease and no current ocular surface complaints

Ocular Surface Changes and Meibomian Gland Dysfunction in Rheumatologic Patients