LG 55LM670T User Manual page 169

✎ Do not drop Dual Play glasses or allow them to come into contact with other
objects. This can result in damage to the product.
✎ The lenses of Dual Play glasses (polarizing film) are easily scratched. Use
a soft clean cloth when cleaning them. Foreign particles on the cloth may
cause scratches.
✎ Do not scratch the surface of the Dual Play glasses' lenses with sharp objects
or wipe them with chemicals. If the lenses get scratched, images may not
look normal when viewing 3D.