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Generaldiscussionandfutureperspectives20912acombinationinvolvingbothenvironmentsForexamplefuturedevelopmentsofARarefocusingtoshiftmoretothe ‘virtualside’ofthisspectrumbyimprovingtheFOVetcAtthesametime VRapplicationsareaimingtoslidetothe ‘realside’byaddingrealisticuserinput(suchashapticfeedbackgloves)intheirenclosedenvironment The MagicLeap AR device is an interesting example The stereoscopicopticalsee-troughdisplaysoftheMagicLeaphavealargeFOV(40°x30°versus30°x175°oftheHoloLens)ahigherresolution(1280x960versus1268x720oftheHoloLens)andeyetrackingcapabilitiesthatmakevirtualcontentmorerealisticRemarkablyMagicLeapalsousesdarksee-throughglasses(probablytoincreasethecontrastbetweentherealworldandvirtualcontent)whichhastheundesirableconsequenceofmaking theblendingof the virtualand therealworldpoorer ThereforeMagicLeap glasses aremoreuseful for applications on the virtualsidethanistheHoloLensFutureARdeviceswillhavedifferentpositionsinthisspectrumLocatingthe“sweetspot”dependsonapplication-specificdemandsbutwefirmlybelievethatthemostoptimallocationisattherightsideofthespectrumSubsequentlythiswillalsofacilitateasmoothtransitiontothetransferphase(fromPart2toPart3)PART3–SURGERYIMPROVE THESURGICAL WORKFLOWImprovementsmoreresearchandgreateracceptancewillensurethatinthefuturetheimplementationofARduringsurgeryisguaranteedAsstatedearlier,thesuccessofsurgicalimplementationalsodependsontheimplementationofARinotherpartsoftheclinicalprocessIngeneraltherearefourimportantreasonswhyandhowARwillchangethesurgicalworkflowReason1-3DvisualizationWhenARbecomesthestandardforsurgicalplanning(Part2)surgeonswillbemorewillingtouseARduringsurgeryAtthismomentARvisualizationisfacingachicken or egg causality dilemmaaplanningisconvertedto2Dbecausethereareno3Ddisplaysthatcanbeusedduringsurgerybutatthesametimetheurgetouse3Ddisplaysislowbecauseevery3Dplanningisdegradedtosimple2DmeasuresFortunatelyitisobviouswhatneedtobedonetosolvethisdilemma