Canada
Practice Relating to Rule 86. Blinding Laser Weapons
Section B. Laser systems incidentally causing blindness
Canada’s LOAC Manual (1999) states:
Blinding as an incidental or collateral effect of the legitimate military employment of laser systems is not covered by the prohibition [on blinding laser weapons]. For example, the legitimate use of a laser targeting system in a tank is lawful even if one of its collateral effects may be to cause blindness. However, such a laser targeting system could not be deliberately used to blind enemy combatants.
Canada’s LOAC Manual (2001) states in its chapter entitled “Restrictions on the use of weapons”:
Blinding as an incidental or collateral effect of the legitimate military employment of laser systems is not covered by the prohibition [on blinding laser weapons]. For example, the legitimate use of a laser targeting system in a tank is lawful even if one of its collateral effects may be to cause blindness. However, such a laser targeting system could not be deliberately used to blind enemy combatants.