Yes, it is illegal to use the night vision devices in Canada without the proper permission legal documents. Canada assists certain type of law about the usage and ownership of the night vision devices since the night vision devices are designed based on the different types of generation and the high advancement involved in the equipment.
Except gen 1 and gen 2, night vision equipment, the gen 3, night vision devices are illegal to use in Canada. The gen 1 and gen 2, night vision devices can be legally assessed in Canada stores for both selling and buying. According to the law of Canada, it is strictly restricted to use the night vision devices for firing a weapon for hunting animals at night.