What was found
(CAN) PILOT WAS MOVING HIS VISOR BACK FROM EXTREME RT SIDE OF VISOR RAIL TO LT, WHEN VISOR FELL OFF RAIL ONTO THROTTLE QUADRANT. LT ENGINE RUN SWITCH ON QUADRANT WAS INADVERTENTLY MOVED TO OFF POSITION BY VISOR IMPACT AND ENGINE STARTED TO SHUT DOWN. PILOT DESCENDED TO FL410 TO KEEP SPEED UP, SELECTED ENGINE RUN SWITCH BACK TO RUN POSITION. SUCCESSFUL RELIGHT OF ENGINE OCCURRED AND A/C WAS BROUGHT BACK TO FL450 AND TRIP CONTINUED WITHOUT FURTHER INCIDENT. MAINT CREW RAN ENGINES ON GROUND TO VERIFY THROTTLE QUADRANT AND ENGINE RUN SWITCHES FUNCTIONALITY OF ENGINE RUN SWITCH CONFIRMED. ENGINE GROUND RUNS PERFORMED BEFORE AIRCRAFT RETURNED TO SERVICE. NO FURTHER CONCERNS WERE IDENTIFIED.