TheLeicaFL800fluorescencemoduleenablesthesurgeontoobservebloodflow throughthe microscopeeyepiecesoronthevideomonitorinrealtime,withoutadditionalmeasuringapparatus.Itisafast,easymethodofcheckingduringsurgerywhethertheaneurysmhasbeenperfectlyclippedandwhetherbloodflowisproperlyflowingthroughthebypass.