Fig. 2

Immobilization of the guinea pig and the images of opened eye and closed eye captured from video recording data. a Plexiglass device. b Immobilization of guinea pigs and blowing air with a syringe. c Image of an opened eye and a closed eye. d The degree of eyelid closure defined as “(x − y)/x”. A greater degree of eyelid closure suggests a better recovery from facial nerve palsy