/956 -Digital video-based combined pupil/corneal reflection ■Remote sensor a ASL EYELINK 1000 ■Head mounted 口ASL501 o SMI iView X EYELINK 2000 Digital video-based combined pupil/corneal reflection  Remote sensor  ASL  EYELINK 1000  Head mounted  ASL 501  SMI iView X  EYELINK 2000