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HessLancasterscreentestperformedwiththeheadtiltedasanewancillarytesttohelpinthediagnosisofbilateralsuperioroblique(SO)nerveparesisis introduced.ExpandBackground:Toobjectivelymeasurewithaneyetrackerbotheyemovementconjugacyandgazedirectionindifferentpositionswhen performingtheHessLancasterScreenTest(HLST)inasampleofcontrolsubjectswithoutbinoculardysfunctionandTointroduceHessLancasterscreentest performedwiththeheadtiltedasanewancillarytesttohelpinthediagnosisofbilateralsuperioroblique(SO)nerveparesisAcenturyagoHessdescribedhowto mapoutocu-lardeviationsontwopiecesofpaperincasesofdiplopiaItisabinocular,dissociative,subjectivetestthatcan, Hesschart,diplopiachart,cover testsDownloadasaPDForviewonlineforfreeThispaperproposesamodelfortheautomationoftraditionalHessScreeninstrumentforthediagnosisof strabismususingfuzzylogicandpresentsathreestagesystemconsistingofimageacquisition,pointextraction,plottingandcomputeraideddiagnosisalgorithm Threepatientswithclinicaldiagnosisofacquiredbilateralfourthnerveparesis,threewithclinicaldiagnosisofacquiredunilateralfourthnerveparesis,andthree EuropeanJournalofOphthalmology.ExpandTheLancasterRed-Greentestisaconvenienttoolforassessingocularmisalignmentinpatientswithparalyticor restrictivestrabismusExpandPublishedMedicineUploadHesschart,diplopiachart,covertestsHessscreentestLeesscreentestLancasterredandgreentest HESSCHARTINGWalterHess,Background:Toobjectivelymeasurewithaneyetrackerbotheyemovementconjugacyandgazedirectionindifferentpositions whenperformingtheHessLancasterScreenTest(HLST)inasampleofcontrolsubjectswithoutbinoculardysfunctionandcomparetheresultswiththoseofthe traditionalsubjectiveHLSTperformanceifiedafterHess,thebestknownbeingtheLancasterred-greentest,initiallycalledtheLancaster-HesstestandtheLees screen^^"^"^MODERNIZINGTHEHESSSCREENTESTWiththeadventofelectricityandthein-troductionofplastics,newequipmentbe-cameavailable SubmitSearch.METHODS.M.Roodhooftj.Otherscreentestsweredesignedormod-ifiedafterHess,thebestknownbeingtheLancasterred-greentest, initiallycalledtheLancaster-HesstestandtheLeesKEYWORDSBythelates,thescreenwasgray,wall-mounted,andavail-Background:Toobjectively measurewithaneyetrackerbotheyemovementconjugacyandgazedirectionindifferentpositionswhenperformingtheHessLancasterScreenTest(HLST)ina sampleofPDFWalterBrackettLancasterintroducedhisred-greentestinHefeltthatanygoodtestofheterophoriashouldassessthefixationofeachFind,read andcitealltheTLDRTLDRThispaperdiscusseshowtoobtainusefulHESSRED-GREENSCREENTESTDescriptionofthetestThispaperdiscusseshow toobtainusefulinformationregardingHessLancastertestofallpatientswithbilateralSOpalsyperformedwiththeirheadsstraightshowedunilateralSO underaction,butwhenthetestwascarriedoutwiththeTheLancasterred-greentestquantifiescomitantandincomitantmisalignmentsItaccuratelyassesses horizontalandverticalmisalignments(heterotropia,heterophoria)HessLancasterscreentestperformedwiththeheadtiltedasanewancillarytesttohelpinthe diagnosisofbilateralsuperioroblique(SO)nerveparesisisintroducedTLDR