简介：目的：探讨获得性免疫缺陷综合征（acquredimmunodeficiencysyndrome，AIDS，简称艾滋病）发生视乳头病变的类型及其与CD4^＋T淋巴细胞的关系。方法：回顾分析107例（214眼）艾滋病患者经眼底彩照及眼底荧光血管造影（fluoresceinangiography，FFA）检查确诊的视乳头病变患者，统计AIDS性视乳头病变的发生率及病变类型以及与CD^＋T淋巴细胞数之间的关系。结果：107例（214跟）AIDS患者发生视乳头病变71眼，占33．2％；其中，前段缺血性视神经病变30眼，占42．2％（30／71）；视盘水肿12眼，占16．9％（12／71）；无体征性视神经病变29眼，占40．8％（29／71）。CD4^＋T淋巴细胞≤50个／μ发生视乳头病变59眼，未发生视乳头病变75眼，发病率44．0％（59／134）；CD^4＋T淋巴细胞≥51个／μL发生视乳头病变12眼，未发生视乳头病变68眼，发病率15．0％（12／80）。经双侧检测统计：χ^2=19．042，P=0．000。说明组间具有显著差异性。结论：AIDS视乳头病变的类型呈多样性，且CD^4＋T淋巴细胞数越少，发生视乳头病变的几率越大。

简介：AIM:Todeterminethenormativevaluesofwhite-towhitecornealdiameterwithOrbscanIITopographySystemandtocomparerightandlefteyesdatainthenormalyoungpopulation.METHODS:Atotalof1001healthyparticipantsaged18-45yparticipatedinthisobservationalcross-sectionalstudy.Thestudypopulationconsistedof616femaleand385malesubjects.ThecornealdiameterwasmeasuredwiththeOrbscanII.Thedifferencesbetweengenders,betweenrightandlefteyesandage-relatedchangeswereevaluated.StatisticalanalyseswereperformedusingStudent’st-test.RESULTS:Theaveragewhite-to-whitedistanceinourstudypopulationwasrecordedas11.65±0.36mm(median:11.60mm,mode:11.70mm,minimum:10.50mmandmaximum:13.60mm).Thewhite-to-whitedistancewas11.60±0.35mminmalesand11.71±0.36mminfemaleswhichwasstatisticallydifferentbetweengenders(P<0.01).However,white-to-whitedistancewasnotstatisticallydifferentbetweenrightandlefteyes.Inaddition,thisparameterdecreasedwithincreasingage.Considering95%confidenceinterval,cornealdiameterlessthan10.93mmandgreaterthan12.34mmwouldbeconsideredasmicrocorneaandmegalocornea,respectivelybasedonthisstudypopulation,usingtheOrbscanIItopography.CONCLUSION:DetaileddescriptionandanalysisofcornealdiameterwithOrbscandemonstratethattheobtainedaveragevalueofhorizontalwhite-to-whiteishigherinmalethanfemaleanddecreasesslightlywithincreasingage.Ourdataalsosuggeststhecutoffvaluesfordefinitionofmicrocorneaandmegalocornea,whichcanbeemployedwiththispopulation.