简介：目的：通过对Q值调整非球面切削与标准化LASIK术后视觉质量的观察来分析Q值引导个性化切削技术的临床效果。方法：对2008-01/05等效球镜低于-12.00D的46例88眼进行非球面切削或标准化LASIK术后进行随访,按术前屈光度数将其分为A组（〈-6.00D）和B组（-6.00～-12.00D）两组,对比各组非球面切削与标准化LASIK术后1mo裸眼视力、Q值、夜间眩光、夜间视物质量及满意率（后3者采取问卷调查）。结果：A、B组内非球面切削与标准化LASIK术后裸眼视力差异无统计学意义（t=1.18,P〉0.05;t=0.62,P〉0.05）;A、B组内非球面切削与标准化LASIK术后Q值差异无统计学意义（t=-0.93,P〉0.05;t=-0.372,P〉0.05）;A组内非球面切削与标准化LASIK术后眩光、夜间视物质量差异无统计学意义（眩光：χ^2=2.397,P＆gt;0.05;夜间视物质量：χ2=1.263,P〉0.05）;B组内非球面切削与标准化LASIK术后眩光、夜间视物质量差异有统计学意义（眩光：χ^2=10.85,P〈0.01;夜间视物质量：χ^2=10.85,P〈0.01）;术后效果满意率达到98％。结论：非球面切削能明显改善-6．00D以上的术后主观视觉质量。

简介：AIM:Todescribethecharacteristicsofmodulationtransferfunction(MTF)ofanteriorcornealsurface,andobtainthethenormalreferencerangeofMTFatdifferentspatialfrequenciesandopticalzonesoftheanteriorcornealsurfaceinmyopes.·METHODS:Fourhundredeyesfrom200patientswereexaminedunderSIRIUScornealtopographysystem.PhoenisanalysissoftwarewasappliedtosimulatetheMTFcurvesofanteriorcornealsurfaceatverticalandhorizontalmeridiansatthe3,4,5,6,7mmopticalzonesofcornea.TheMTFvaluesatspatialfrequenciesof5,10,15,20,25,30,35,40,45,50,55and60cycles/degree(c/d)wereselected.·RESULTS:TheMTFcurveofanteriorcornealsurfacedecreasedrapidlyfromlowtointermediatefrequency(0-15cpd)atvariousopticalzonesofcornea,thevaluedecreasedto0slowlyathigherfrequency(>15cpd).Withtheincreaseoftheopticalzonesofcornea,MTFcurvedecreasedgradually.3)Intherangeof3mm-6mmopticalzonesofthecornea,theMTFvaluesmeasuredathorizontalmeridianweregreaterthanthecorrespondingvaluesathorizontalmeridianofeachspatialfrequency,thedifferencewasstatisticallysignificant(P<0.05).At7mmopticalzonesofcornea,theMTFvaluesmeasuredathorizontalmeridianwerelessthanthecorrespondingvaluesatverticalmeridianat10-60spatialfrequencies(cpd),andthedifferencewasstatisticallysignificantin25,30,35,40,45,50cpd(P<0.05).·CONCLUSION:MTFcanbeusedtodescribetheimagingqualityofopticalsystemsatanteriorcornealsurfaceobjectivelyindetail.

简介：超声乳化术已经成为了目前治疗老年性白内障的主要手术方式。随着超声乳化术的广泛应用，该种术式对于眼前节结构和功能影响的研究也层出不穷。本文回顾了近几年来国内外这方面的相关文献，阐述了超声乳化术对眼前节结构和功能的影响。

简介：AIM:Todefinetheultrasonographicstructureofnormallowereyelidanatomiccompartmentsandtheirspacialrelationshipindynamicmotion.METHODS:Highresolutionultrasound(15MHz)wasperformedonthelowereyelidsof7normalsubjects.Movementsofthelowereyelidanditscompartmentswerevisualizedwithultrasound.Inaddition,themaximalexcursionareaofthelowereyelidfatcompartmentsandretractormotionswasmeasuredbeforeandaftermotion.RESULTS:Theorbicularismusclecouldbeseenasanecholucentstructurebetweenthedermisandtheechodencefatpads.Lowereyelidfatpadseemstobedividedinto2compartmentsasrangeofmotionanddirectionofmovementofeachofthemvaries.Itseemsthatthesecompartmentshavealsodifferentbehavior.Themeasuredprofileareaofthevisiblenormallowereyelidfatpadsduringmovementofglobefromup-gazetodown-gazedecreasedby50%.Orderofmovementoflowereyelidstructuresseemstobeasfollows:afterglobemovementfistweseeretractormovement,anteriororbitalfatpad,thenskinandseptum,andfinallymovementofinferiorfatpad.CONCLUSION:Ultrasoundrepresentsanoninvasivetoolforthevisualizationoflowereyelidmorphology.Expandingitsapplicationcouldhelpusunderstandthecompartmentalchangesinphysiologicaleyelidmovement,inaginganddiseasedstudypopulations,aswellasassessoperativeoutcomes.

简介：为探讨迷路的老化过程,应用透射电镜观察了新生、青年、老年豚鼠的耳蜗和迷路血管系统的变化。发现老年豚鼠血浆成分有改变、听力呈下降倾向;毛细胞、迷路血管及螺旋神经和螺旋神经节细胞均可见一系列损害。作者推测在耳蜗老化过程中血管系统的变化非常重要,至少是耳蜗其他部位老年性改变的原因之一。

简介：目的：观察早期衰老大鼠视网膜色素上皮-光感受器细胞复合体超微结构的变化。方法：取3月龄及12月龄大鼠视网膜,制成半薄切片,透射电镜下观察视网膜色素上皮-光感受器细胞复合体超微结构的变化。结果：12月龄大鼠视网膜中出现视网膜色素上皮细胞（retinalpigmentepithelium,RPE）凋亡和RPE-光感受器细胞复合体的退行性改变。结论：视网膜色素上皮-光感受器细胞复合体的退行性改变是视网膜衰老的早期表现。