Règle correspondante
United States of America
Practice Relating to Rule 86. Blinding Laser Weapons
Section B. Laser systems incidentally causing blindness
The Annotated Supplement to the US Naval Handbook (1997) states:
While blinding as an incidental effect of “legitimate military employment” of range finding or target acquisition lasers is not prohibited by [the 1995 Protocol IV to the Convention on Certain Conventional Weapons], parties thereto are obligated “to take all feasible precautions” to avoid such injuries. 
United States, Annotated Supplement to the Commander’s Handbook on the Law of Naval Operations, prepared by the Oceans Law and Policy Department, Center for Naval Warfare Studies, Naval War College, Newport, Rhode Island, November 1997, § 9.8, footnote 45.
The US Naval Handbook (2007) states:
Directed-energy devices, such as laser … are not proscribed by the law of armed conflict. Lasers may be employed as a rangefinder or for target acquisition, despite the possibility of incidental injury to enemy personnel. Laser “dazzlers” designed to temporarily disorient may also be employed. 
United States, The Commander’s Handbook on the Law of Naval Operations, NWP 1-14M/MCWP 5-12.1/COMDTPUB P5800.7, issued by the Department of the Navy, Office of the Chief of Naval Operations and Headquarters, US Marine Corps, and Department of Homeland Security, US Coast Guard, July 2007, § 9.8.
In 1995, in a US Department of Defense policy statement on blinding lasers, the need for some restrictions, aside from the prohibition of deliberate blinding, was explained thus:
Laser systems are absolutely vital to our modern military. Among other things, they are currently used for detection, targeting, range-finding, communications and target destruction. They provide a critical technological edge to US forces and allow our forces to fight, win and survive on an increasingly lethal battlefield. In addition, lasers provide significant humanitarian benefits. They allow weapons systems to be increasingly discriminate, thereby reducing collateral damage to civilian lives and property. The Department of Defense recognizes that accidental or incidental eye injuries may occur on the battlefield as the result of the use of legitimate laser systems. Therefore we continue to strive, through training and doctrine, to minimize these injuries. 
United States, Defenselink News Release, Reference Number: 482-95, 1 September 1995.