简介：AIM:Toinvestigatethediffusioncharacteristicsofwaterofopticnerveandopticradiationinhealthyadultsanditsrelatedfactorsbydiffusiontensorimaging（DTI）at3T.METHODS:Atotalof107healthyvolunteersperformedheadconventionalMRIandbilateralopticnerveandopticradiationDTI.TheprimarydataofDTIwasprocessedbypost-processingsoftwareofDTIstudio2.3,obtainingfractionalanisotropyvalue,meandiffusivityvalue,principalenginevalue,orthogonalenginevaluebymeasuring,andanalyzedbytheSPSS13.0statisticalsoftware.RESULTS:Thebilateralopticnerveandopticradiationfiberspresentedgreencolorindirectionalencodedcolor（DEC）mapsandpresentedhighsignalinfractionalanisotropy（FA）maps.TheFAvalueoftheleftopticnervewas0.598±0.069andtherightwas0.593±0.065;themeandiffusivity（MD）valueoftheleftopticnervewas（1.324±0.349）×10-3mm2/sandtherightwas（1.312±0.350）x10-3mm2/s;theprincipalenginevalue(λ?)oftheleftopticnervewas（2.297±0.522）×10-4mm2/sandtherightwas（2.277±0.526）×10-3mm2/s;theorthogonalenginevalue（λ⊥）oftheleftopticnervewas（0.838±0.285）×10-3mm2/sandtherightwas（0.830±0.280）×10-3mm2/s;theFAvalueoftheleftopticradiationwas0.636±0.057andtherightwas0.628±0.056;themeandiffusivity（MD）valueoftheleftopticradiationwas（0.907±0.103）×10-3mm2/sandtherightwas（0.889±0.125）×10-3mm2/s;theprincipaleigenvalue(λⅡ)oftheleftopticradiationwas（1.655±0.210）×10-3mm2/sandtherightwas（1.614±0.171）×10-3mn2/s;theorthogonalenginvalue（λ⊥）oftheleftopticradiationwas（0.531±0.103）×10-3mm2/sandtherightwas（0.524±0.152）×10-3m

简介：目的观察球后注射山莨菪碱联合高压氧治疗非动脉炎性前部缺血性视神经病变的疗效。方法选取2015年6月-2016年6月我院收治的60例非动脉炎性前部缺血性视神经病变患者,随机分为2组：治疗组和对照组,2组均给予皮质激素、血管扩张剂、营养神经类药物等治疗。治疗组在此基础上给予山莨菪碱球后注射联合高压氧,15天后除了停止球后注射山莨菪碱,其余治疗不变,30天后比较2组治疗前后视力、视野的改变。结果视力治疗组治愈13眼,显效4眼,有效10眼,无效3眼。对照组治愈6眼,显效12眼,有效8眼,无效4眼。两组对比经ridit分析Z=-3.074,P=0.002。视野治疗组治愈15眼,显效9眼,有效3眼,无效3眼。对照组治愈3眼,显效8眼,有效14眼,无效5眼,两组经ridit分析Z=-3.504,P=0.000。结论球后注射山莨菪碱联合高压氧治疗缺血性视神经病变疗效较好。

简介：AIM:Toassesstheeffectofmyopiaonthethicknessofretinalnervefiberlayer(RNFL)measuredby3Dopticalcoherencetomography(3D-OCT)inagroupofnonglaucomatousChinesesubjects.METHODS:Twohundredandfifty-eighteyesof258healthyChinesemyopicindividualswererecruitedandfourgroupswereclassifiedaccordingtotheirsphericalequivalent(SE):lowmyopia(n=42,-0.50

简介：目的：利用频域三维相干光学断层扫描（threedimensionalfrequencydomaincoherentopticaltomography,3D-OCT）评估准分子激光原位角膜磨镶术（laserinsitukeratomileusis,LASIK）对视网膜神经纤维层厚度（retinalnervefibrelayerthickness,RNFLT）的影响。方法：对83例83右眼接受LASIK治疗的受试者分别于术前及术后1d;1wk;1,3mo行3D-OCT检查,测量视乳头上方、下方、鼻侧、颞侧及12个钟点位RNFLT,利用重复测量方差分析及配对t检验对术前及术后的数据统计学处理。结果：术前及术后各时间点行重复测量方差分析显示,视乳头下方、颞侧、5：00～11：00位RNFLT均值无显著差异（P〉0.05）,而视乳头上方、鼻侧、1：00～4：00位、12：00位RNFLT有显著差异（P〈0.05）;进一步对术前及术后各时间点视乳头上方、鼻侧、1：00～4：00位、12：00位RNFLT分别行配对t检验得出,术后1d时视乳头上方、鼻侧及1：00～4：00位、12：00位RNFLT较术前变薄,差异有统计学意义（P〈0.05）,术后1wk;1,3mo时以上各方位RNFLT较术前比较均无统计学差异（P〉0.05）。同时表明RNFLT变薄与屈光度及激光时间成正相关。结论：LASIK术后早期上方及鼻侧RNFLT变薄,但术后1wk恢复至正常水平,LASIK手术对RNFLT无长远影响。

简介：AIM:Toevaluatetheaccuracyofsphericalequivalent(SE)estimatesofadouble-passsystemandtocompareitwithretinoscopy,subjectiverefractionandatablemountedautorefractor.METHODS:Non-cycloplegicrefractionwasperformedon125eyesof65healthyadults(age23.5±3.0years)fromOctober2010toJanuary2011usingretinoscopy,subjectiverefraction,autorefraction(AutokeratorefractometerTOPCONKR-8100,Japan)andadoublepasssystem(OpticalQualityAnalysisSystem,OQAS,VisiometricsS.L.,Spain).Nineconsecutivemeasurementswiththedouble-passsystemwereperformedonasubgroupof22eyestoassessrepeatability.ToevaluatethetruenessoftheOQASinstrument,theSElaboratorybiasbetweenthedoublepasssystemandtheothertechniqueswascalculated.RESULTS:TheSEmeancoefficientofrepeatabilityobtainedwas0.22D.SignificantcorrelationscouldbeestablishedbetweentheOQASandtheSEobtainedwithretinoscopy(r=0.956,P<0.001),subjectiverefraction(r=0.955,P<0.001)andautorefraction(r=0.957,P<0.001).ThedifferencesinSEbetweenthedouble-passsystemandtheothertechniquesweresignificant(P<0.001),butlackedclinicalrelevanceexceptforretinoscopy;Retinoscopygavemorehyperopicvaluesthanthedouble-passsystem-0.51±0.50Daswellasthesubjectiverefraction-0.23±0.50D;Moremyopicvalueswereachievedbymeansofautorefraction0.24±0.49D.CONCLUSION:Thedouble-passsystemprovidesaccurateandreliableestimatesoftheSEthatcanbeusedforclinicalstudies.Thistechniquecandeterminethecorrectfocuspositiontoassesstheocularopticalquality.However,ithasarelativelysmallmeasuringrangeincomparisonwithautorefractors(-8.00to+5.00D),andrequirespriorinformationontherefractivestateofthepatient.