Thanks guys it seems mouse lasers are Class 1 and not dangerous, but I'll avoid looking at them anyway..
PS- I read an article some years ago in Reader's Digest (I think it was), in which the crew of a US Coastguard helicopter were watching a Russian trawler some distance off when they were briefly hit by a flash of light from it. "I think we just got lased" said one of them, and although there were no immediate effects, their eyes felt sore when they got back to base, and recovered with no apparent ill effects.
PPS- In the Falklands War of 1982 the Brit Navy were using lasers to dazzle incoming enemy pilots, at least one warship was fitted with one and it was known as a "flasher" but I don't know if it was ever used in action. I later read up on the subject and I gather lasers have generally been dropped by the world's armed forces because "they can easily be countered".
The subject is still a bit hush-hush but perhaps a special coating on the perspex cockpit canopy or on the pilots goggles can deflect lasers.
Also, I suppose the military thought "Why hit a plane with a laser when you might just as well hit it with a missile or gunfire?"..;)