Bell's palsy was a medical condition in which the nerves of the facial muscles become paralyzed. This results in the inability to control any of those muscles, which can often include the muscles which control the blinking of the eyes. This sometimes requires those with this condition to wear an eyepatch to protect the eye.

Captain James Deakins had this condition in 2005. (CI: No Exit)

Jamey Sheridan had this condition in reality, so it was written into his character.