LG UB98 Series Owner's Manual page 16

SAFETY INSTRUCTIONS
16
Cautions when using the 3D glasses
Make sure to use LG 3D glasses. Otherwise, you may not be able to view
3D videos properly.
Do not use 3D glasses instead of your normal glasses, sunglasses or
protective goggles.
Using modified 3D glasses may cause eye strain or image distortion.
Do not keep your 3D glasses in extremely high or low temperatures. It will
cause deformation.
The 3D glasses are fragile and are easily scratched. Always use a soft,
clean piece of cloth when wiping the lenses. Do not scratch the lenses of the
3D glasses with sharp objects or clean/wipe them with chemicals.