Tru-Vu Omniscreen Eyeset with Viewholes - This lightframe is the same as the Tru-Vu Omniscreen Eyeset, but with viewholes cut in them so you can see while running a session. This accessory is popular for athletes who can train while enjoying audio-visual entrainment, and for students for studying and reading. Only for PAL and ALERT light and sound systems.