Keratoconus is a common disease in which the central or paracentral cornea undergoes progressive thinning, resulting in a cone-shaped cornea. It has been associated with many systemic disorders such as Down syndrome, osteogenesis imper-fecta, and joint hypermobility. Herein, temporomandibular joint dislocation under general anesthesia during supraglottic airway device placement before deep anterior lamellar keratoplasty procedure in a keratoconus patient is reported.