Samsung PL64E8000GFXZP - Manual (Page 251)

If you feel eye strain, stop viewing
3D TV, remove your 3D Active
Glasses and rest.
ΠA responsible adult should frequently
check on children who are using the
3D function. If there are any reports
of tired eyes, headaches, dizziness, or
nausea, have the child stop viewing
3D TV and rest.
ΠDo not use the 3D Active Glasses
for other purposes (such as general