They can be restricted based on power or class. A Class 2 laser pointer used for presentations or a laser rangefinder aren't going to be powerful enough to both

They can be restricted based on power or class. A Class 2 laser pointer used for presentations or a laser rangefinder aren't going to be powerful enough to bother aircraft, nor in most cases to damage eyesight. Currently there is a voluntary code to not sell lasers over 1mW to the general public, but this isn't a legal requirement.