原发性前房角关闭眼激光周边虹膜切开术后前房角形态学变化

目的 定量检测和评价原发性前房角关闭(PAC)眼行激光周边虹膜切开(LPI)术后前房角形态学变化.方法 临床病例系列研究.对入选的31例(54只眼)PAC患者于LPI术前、术后2周、6及12个月,进行眼科常规检查,定量检测超声活体显微镜(UBM)图像中前房角的各项参数.各随访时间点的UBM参数比较采用重复测量的方差分析,巩膜突前750μm与500 μm处各参数的比较采用配对t检验.结果 LPI术后前房深度较术前加深0.10 mm,但差异并无统计学意义(F=3.50,P＞0.05).LPI术前,巩膜突前750 μm处,前房角开放距离(66.2±51.6) μm,小梁网与虹膜间夹角5.0°±3.5°,前房角隐窝面积(0.025±0.017)mm2,小梁网与睫状突距离(571.0±97.2) μm;LPI术后2周、6及12个月,巩膜突前750 μm处,前房角开放距离分别为(165.0±70.3)、(185.8±68.5)及(196.1±77.7)μm,小梁网与虹膜间夹角分别为(11.9±4.9)、(13.3±4.8)及14.0°±5.4°,前房角隐窝面积分别为(0.058±0.024)、(0.065±0.023)及(0.068±0.026)mm2,小梁网与睫状突间距离分别为(647.1±113.0)、(701.8±93.4)及(670.1±95.4) μm,均较LPI术前增加,差异均有统计学意义(前房角开放距离:F =92.60,小梁网与虹膜间夹角:F=92.60,前房角隐窝面积:F=92.60,小梁网与睫状突间距离:F =34.00;P ＜0.05).术后前房角开放距离、小梁网与虹膜间夹角及前房角隐窝面积均较术前增加1倍以上.巩膜突前750 μm处检测参数的增加幅度均较巩膜突前500 μm处大(前房角开放距离:t=5.90,P＜0.05;小梁网与虹膜间夹角:t=2.70,P＜0.05;前房角隐窝面积:t=2.00;P =0.05).结论 LPI能显著增宽PAC眼的周边前房角,且随访观察1年期间前房角仍开放.巩膜突前750 μm处的参数比500μm处参数对评价周边前房角形态变化更为敏感.     

APAC对侧眼激光周边虹膜切除术后3min暗室激发试验的临床观察

目的:观察急性原发性房角关闭(acut primary angle colsure,APAC)对侧眼激光周边虹膜切除术(laser peripheral iridotomy,LPI)后3min超声生物显微镜(ultrsounic biomicroscopy,UBM)暗室激发试验的相关生物学参数,探讨可疑原发性房角关闭(primary angle closure suspect,PACS)患者LPI术后发生接触性房角关闭的风险因素.方法:选择78例 APAC 对侧眼(无周边虹膜前粘连)为研究对象,LPI术后进行3min UBM暗室激发试验,观察中央前房深度(ACD)、房角开放距离(AOD500)、周边虹膜厚度(IT)、虹膜膨隆度(IC)、虹膜根部附着位置、小梁网睫状突距离(TCPD)等各项眼前节结构参数及房角接触性关闭方位数(NPAC) 并进行统计学分析.结果:LPI术后暗室下UBM检查至少1个方位发生接触性房角关闭的有26眼(33%),其中3min UBM暗室激发试验阳性的有19眼(24%),暗室激发试验时眼压升高值与接触性房角关闭的方位数呈正相关(r=0.84,P<0.01).接触性房角关闭(+)组与接触性房角关闭(-)组暗室时与正常光线下比较AOD500、IT、IC变化值有显著统计学意义(均P<0.01).单因数Logistic回归分析表明,AOD500(P=0.003)、IT(P=0.012)、IC(P=0.043)、TPCD(P=0.015)、虹膜根部附着位置(P=0.024)是暗室下接触性房角关闭(+)的相关因素;多因素Logistic回归分析表明IT(P=0.011)、TPCD(P=0.009)和虹膜根部附着位置(P=0.02)是暗室下接触性房角关闭(+)的独立相关因素.结论:PACS患者行LPI术后仍有部分在暗室下发生接触性房角关闭,虹膜周边肥厚、睫状体前位、虹膜根部附着点前移是重要的风险因素,在LPI术后应当进行长期随访与干预治疗.     

原发性闭角型青光眼患者与可疑原发性房角关闭患者虹膜睫状体构型特征的比较分析

目的 比较原发性闭角型青光眼（PACG）患者与可疑原发性房角关闭（PACS）患者的房角生物学特征。设计 回顾性比较性病例系列。研究对象 2019年10月至2021年3月同济医院58例PACG及PACS患者。方法 回顾患者病例资料及超声生物显微镜（UBM）图像,测量其房角生物学参数,进行定量及定性分析。主要指标 中央前房深度（ACD）、500 μm房角开放距离（AOD500）、500 μm小梁虹膜夹角（TIA500）、500 μm小梁睫状突距离（TCPD500）、500 μm小梁睫状体夹角（TCA500）、虹膜根部厚度（IT500）、睫状突长度（CPL）、睫状体厚度（CBT）。结果 与PACS组（n=25）相比,PACG组（n=33）患者最佳矫正视力（BCVA）更低（0.4±0.35、0.2±0.17）,基线眼压更高（21.17±6.09、15.57±3.57 mmHg）,眼轴更短（22.17±1.22、22.74±0.88 mm）,ACD更浅（1.77±0.27、1.94±0.25 mm）,AOD500、TIA500、TCPD500、TCA500更小（0.04±0.04、0.10±0.05 mm;3.90±4.58、11.07±4.77°;0.51±0.10、0.58±0.10 mm;60.55±13.26、71.54±12.58°）,CPL更长（1.43±0.26、1.28±0.15 mm）。虹膜插入点位于睫状体基底部的比例（54.5%、20.0%）及睫状体前旋的比例（68.0%、39.4%）PACG组较PACS组更大（P均<0.05）。而IT500、CBT、虹膜成角和虹膜凸度在两组间未见差异。结论 PACG眼较PACS眼具有更短的眼轴和更浅的前房,长而前旋的睫状体构型更明显,虹膜插入点位于基底部的比例更高。（眼科,2022,31： 20-26）     

原发性闭角型青光眼激光周边虹膜切开术后前房角形态变化的一年观察

目的定量观察原发性闭角型青光眼(PACG)激光周边虹膜切开术(LPI)后前房角形态变化及周边虹膜前粘连(PAS)对LPI术后效果的影响。设计前瞻性病例系列。研究对象河北省邯郸市眼科医院连续的25例(39眼)PACG患者。方法患眼行LPI治疗。术前、术后2周、6个月、12个月时行眼科常规检查及超声生物显微镜(UBM)检查。根据末次随访时眼压情况分为眼压控制不良组(A组)及眼压控制良好组(B组)。各随访时间点的UBM参数进行重复测量的方差分析,组间比较采用配对t检验及Wilcoxon检验。主要指标UBM图像中测量的前房角参数。结果平均随访时间为(386.4±36.7)天。LPI术后2周、6个月及12个月的房角开放距离(AOD)、小梁虹膜夹角(TIA)、虹膜隐窝面积(ARA)较术前增加均有统计学意义(P均<0.001)。小梁睫状突距离(TCPD)术后12个月较术前增加具有统计学意义(P<0.001)。B组AOD500、TIA500、ARA500及TCPD均大于A组(P均<0.05),而PAS钟点范围少于A组(P=0.01)。结论 LPI能显著增宽PACG患者的周边前房角,但PAS的范围对LPI的效果起到明显的制约作用。     

PACG激光虹膜切开术前后前节OCT扫描各参数变化研究

目的：观察原发性闭角青光眼（primary angle closure glaucoma,PACG）行激光虹膜切开术前后前节OCT扫描参数变化。方法：原发性闭角型青光眼30例42眼1/2以上象限房角开放,进行自身对照研究,利用前节OCT于激光虹膜切开术前及术后4wk进行检查,主要指标包括：前房角开放距离、小梁网与虹膜间面积、中央前房深度。术前术后检测参数比较,服从正态分布采用配对t检验,不服从正态分布的采用秩和检验。结果：PACG患者30例42眼LPI术前距巩膜突500μm处,前房角开放距离0.172±0.078μm,小梁网与虹膜间面积0.066±0.025mm2;距巩膜突750μm处,前房角开放距离0.268±0.133μm,小梁网与虹膜间面积0.122±0.045mm2;LPI术后距巩膜突500μm处,前房角开放距离0.277±0.105μm,小梁网与虹膜间面积0.113±0.041mm2;距巩膜突750μm处,前房角开放距离0.388±0.154μm,小梁网与虹膜间面积0.194±0.063mm2（P〈0.05）差异有统计学意义,但前房深度无明显变化,差异无统计学意义（P=0.108）。结论：激光虹膜切开术可以解决瞳孔阻滞,使前房角开放距离、小梁网与虹膜间面积增加,但前房深度不变。     

可疑原发性房角关闭患者激光周边虹膜切除术后一年的房角生物测量分析

目的应用超声生物显微镜(UBM)测量评价可疑原发性房角关闭(PACS)患者激光周边虹膜切除术(LPI)后的房角生物学形态变化。设计前瞻性病例系列。研究对象河北省邯郸市眼科医院连续的55例PACS患者。方法每例患者随机选取一眼行LPI治疗。LPI术前及术后12个月进行眼科常规检查及UBM检查。主要指标UBM图像房角参数。结果 LPI术后12个月时AOD500、AOD750、TCPD500、TCPD750、TIA500、TIA750、ARA500及ARA750较术前均明显增加(P均<0.001)。AOD750、TIA750及ARA750术后12个月时较术前增加幅度均在1倍以上(1.08～1.14倍)。LPI术后,激光眼上方房角的变化幅度最大,颞侧的变化幅度最小,且巩膜突750μm前的参数的增幅均较巩膜突500μm的参数增幅大。与对侧眼相比,除IT750与IT500以外,术后12个月各项参数的测量值均明显增加,差异具有显著性(P均<0.01)。且巩膜突750μm前的参数增幅均较巩膜突500μm增幅大。结论一年的随访研究显示,LPI能显著增宽PACS者周边前房角。巩膜突750μm前的参数在评价周边前房角上更为敏感。     

激光周边虹膜切开术后的前房角变化

目的利用前节相干光断层扫描（OCT）对激光周边虹膜切开术（LPI）手术前后的前房角变化进行研究。方法 32例（34只眼）接受LPI治疗后分别在手术前及手术后1周检查前节OCT,测量房角开放距离（AOD）、小梁虹膜空间面积（TISA）、巩膜突与虹膜的夹角,部分眼睛同时检查了超声生物显微镜（UBM）。结果 OCT检查可以发现LPI术后的房角变宽,AOD、TISA、巩膜突与虹膜的夹角变大,但是UBM检查为非瞳孔阻滞型的OCT参数变化不明显。结论前节OCT有助于判断LPI手术的疗效。     

急性原发性房角关闭对侧眼激光周边虹膜切除术后接触性房角关闭的研究

目的了解急性原发性房角关闭（APAC）对侧眼激光周边虹膜切除术（LPI）后接触性房角关闭的发生率和眼部解剖特征。方法前瞻性研究。选择54例APAC对侧眼没有虹膜前黏连（PAS）的患者作为研究对象,平均年龄（67．1±7．2）岁（54—83岁）。采用超声生物显微镜（UBM）在暗环境下观察LPI后是否发生接触性房角关闭．并比较发生接触性房角关闭与不发生接触性房角关闭患眼的眼压、房角及各项UBM参数,包括房角开放距离。（AOD跏）、房角隐窝面积,。（ARA750）、小梁虹膜夹角（T—I角）、小梁睫状体距离（TCPD）、周边虹膜厚度（IT1）、虹膜悬韧带距离（IZD）、虹膜根部附着位置、中央前房深度（ACD）。对两组数据采用独立样本t检验及两样本秩和检验进行分析。结果LPI后暗环境下UBM检查至少一个象限发生接触性房角关闭的有20例,占37％。反映房角开放程度的指标（AOD500、ARA750、T-I角）和反映睫状体位置的指标（TCPD）：接触性房角关闭（＋）组小于（-）组（t=11．741、11．089、12．175、4．349,P均〈0．01）;反映虹膜形态和位置的指标IT1：接触性房角关闭（＋）组大于（-）组（t=-3．300,P=0．002）;IZD、虹膜根部附着位置及ACD比较,两组差异无统计学意义（t=-1．880,P=0．066;Z=-1．423,P=0．155;t=0．072,P=0．942）。结论APAC对侧眼LPI后在暗环境下仍有一定比例发生接触性房角关闭,房角窄、睫状体前位、周边虹膜厚是LPI后发生接触性房角关闭的解剖学特点,提示LPI后具有这些解剖特点的APAC患者有可能进展为慢性房角关闭。     

房角关闭机制指导下可疑原发性房角关闭患者激光干预的疗效评价

目的 根据房角关闭的不同机制,对可疑原发性房角关闭（PACS）患者行激光周边虹膜切除（LPI）术或LPI联合激光周边虹膜成形（LPIP）术,通过超声生物显微镜（UBM）评估PACS患者激光早期干预的疗效。设计 前瞻性病例系列。 研究对象2016年1月-11月在河北省邯郸市眼科医院连续就诊的PACS患者50例（65眼）。方法 根据房角关闭的不同机制,通过UBM评估患眼,对所有入选患眼均首先行LPI治疗,术后第3天复查UBM,检查提示仍存在至少一个象限房角呈接触性关闭的患者再进一步联合LPIP治疗。术后3天复查UBM,根据测量的相关参数的前后变化评价治疗效果。主要指标 UBM图像中的中央前房深度（ACD）,巩膜突前500 μm处的房角开放距离（AOD）、小梁虹膜夹角（TIA）、房角隐窝面积（ARA）、小梁睫状体距离（TCPD）、虹膜厚度（IT）。结果 65眼中,47眼（72.3%）行LPI治疗后3天UBM检查未发现存在至少一个象限的房角接触性关闭,术后AOD、TIA、TCPD、ARA较术前均明显增加（P均<0.01）,IT较术前无明显变化（P=0.465）;18眼（27.7%）行LPI术后3天,UBM提示存在至少一个象限的房角接触性关闭,联合LPIP治疗后AOD、TIA、TCPD、ARA较术前均明显增加（P均<0.01）,IT较LPI术后减少更明显（P<0.01）。结论 LPI后UBM可用于判断房角关闭的机制,并据此考虑是否联合LPIP,可进一步改善非单纯性瞳孔阻滞机制的可疑房角关闭患者的疗效。     

原发性前房角关闭激光周边虹膜切除术后前房角的改变

目的 利用超声生物显微镜(UBM)筛查原发性前房角关闭(PAC)眼,进行预防性激光周边虹膜切除术(LPI),比较LPI前后前房角形态变化,探索阻止PAC向原发性闭角型青光眼(PACG)进展的方法.方法 应用前瞻性干预性病例研究.对2009年12月至2011年3月遵义医学院眼科门诊的PAC患者(经UBM检查有1个位点以上虹膜小梁网暂时性接触者)进行LPI治疗,术后2周复查UBM.结果 (1)暗光线LPI前、后PAC发生率分别为96.43％ (27/28)、32.14％ (9/28),明光线下分别为67.86％ (19/28)、7.14％ (2/28),LPI后PAC发生率降低,差异有统计学意义(P＜0.05).(2) UBM参数变化情况:明、暗光线下AOD500、TIA术后较术前均增大差异有统计学意义(P ＜0.001),LPI后房角宽度增加;明、暗光线下ILCD术后较术前增大、ILA术后较术前减小差异有统计学意义(P ＜0.001),LPI后瞳孔L阻滞力降低;LPI后暗光线下ICPD术后较术前减小差异有统计学意义(P＜0.05),TCPD明光线下术后较术前增大差异有统计学意义(P＜0.05),提示LPI后有虹膜后陷、睫状体后移;暗光线下比较IT1,术后上方位点变薄差异有统计学意义(P＜0.05).结论 对尚未发生房角粘连的PAC行LPI治疗,能使PAC房角增宽,瞳孔阻滞力下降,阻止部分PAC向PACG进展,降低PACG的发生率.     

Comparison of ultrasound biomicroscopy and spectral-domain anterior segment optical coherence tomography in evaluation of anterior segment after laser peripheral iridotomy

AIM: To quantitatively assess narrow anterior chamber angle using spectral-domain anterior segment optical coherence tomography (SD-AS-OCT) and ultrasound biomicroscopy (UBM), and to evaluate the correlations and consistency between SD-AS-OCT and UBM. METHODS: Fifty-five eyes from 40 patients were examined. Patients were diagnosed with primary angle-closure glaucoma (PACG) remission (11 eyes from 8 patients), primary angle closure (PAC, 20 eyes from 20 patients) and PAC suspect (24 eyes from 12 patients). Each eye was examined by SD-AS-OCT and UBM after laser peripheral iridotomy (LPI). The measurements of SD-AS-OCT were angle open distance (AOD), anterior chamber angle (ACA), trabecular iris angle (TIA), and trabecular iris space area (TISA). UBM measurements were AOD and TIA. Correlations of AOD500 and TIA500 between UBM and AS-OCT were assessed. All parameters were analysed by SPSS 16.0 and MedCalc. RESULTS: ACA, TIA and AOD measured by SD-AS-OCT reached a maximum at the temporal quadrant and minimum at the nasal quadrant. TISA reached the maximum at the inferior and minimum at the superior quadrant. Group parameters of AOD500 and AOD750 showed a linear positive correlation, and AOD750 had less variability. UBM outcomes of AOD500 and TIA500 were significantly smaller than those of SD-AS-OCT. The results of the two techniques were correlated at the superior, nasal and inferior quadrants. CONCLUSION: Both UBM and SD-AS-OCT are efficient tools for follow-up during the course of PACG. We recommended using parameters at 750 µm anterior to the sclera spur for the screening and follow-up of PACG and PAC. The two methods might be alternatives to each other.     

A prospective ultrasound biomicroscopy evaluation of changes in anterior segment morphology after laser iridotomy in Asian eyes

PURPOSE: To prospectively quantify changes in anterior segment morphology after laser iridotomy using gonioscopy and ultrasound biomicroscopy (UBM). DESIGN: Prospective comparative observational case series. PARTICIPANTS: Fifty-five fellow eyes of patients presenting with acute primary angle closure (APAC). METHODS: The fellow eyes of patients presenting with APAC were examined with UBM, A-scan ultrasonography, and optical pachymetry at presentation and 2 weeks after sequential argon/neodymium yttrium-aluminum-garnet laser peripheral iridotomy (LPI). UBM images were analyzed using UBM Pro 2000 software. Baseline measurements were made both under standard lighting conditions and in darkness to look for changes in anterior segment findings. MAIN OUTCOME MEASURES: The degree of angle opening was measured using the angle-opening distance (AOD) at 250 and 500 microm from the scleral spur (AOD250 and AOD500, respectively) and angle recess area (ARA). RESULTS: Fifty-five Asian patients were examined; AOD250, AOD500, and ARA all significantly increased after sequential laser iridotomy (P < 0.002). Gonioscopic grading of the angle opening significantly increased in all 4 quadrants (P < 0.001). The Van Herick grade of limbal anterior chamber depth increased (P < 0.001), whereas the number of eyes classified as occludable decreased (73%-33%, P < 0.001). Anterior chamber depth did not change significantly (2.41 mm +/- 0.28 mm vs. 2.42 mm +/- 0.30 mm, P = 0.43) as measured with optical pachymetry. Increased illumination increased the angle-opening measures, but induced a different alteration in peripheral iris morphology. Illumination-induced changes were greater after iridotomy than before laser treatment. CONCLUSIONS: In Asian eyes at high risk of developing APAC, sequential LPI produced a significant widening of the anterior chamber angle without deepening the anterior chamber centrally. LPI produces changes in iris morphology that are different from those caused by an increase in illumination, indicating that different mechanisms account for angle opening under these 2 conditions.     

Comparison of ultrasound biomicroscopic parameters after laser iridotomy in eyes with primary angle closure and primary angle closure glaucoma

PURPOSE: To study changes in anterior segment morphology after laser peripheral iridotomy (LPI) in primary angle closure (PAC) and primary angle closure glaucoma (PACG) using ultrasound biomicroscopy (UBM). METHODS: Ninety-three eyes of 93 patients underwent anterior segment evaluation including gonioscopy, disc evaluation with + 90D lens, applanation intraocular pressure, and standard achromatic perimetry. UBM was performed before and 2 weeks after Nd:YAG LPI to measure the trabecular-iris angle (TIA), the angle-opening distance (AOD 250/500), and the central anterior chamber depth (ACD). RESULTS: The superior TIA widened from a mean of 7.54+/-3.15 to 15.66+/-6.69 degrees (P=0.0001), the inferior TIA increased from a mean of 9.0+/-4.7 to 15.9+/-6.8 degrees (P=0.0001) after LPI in PAC. In PACG, the mean superior angle changed from 4.55+/-2.5 to 6.12+/-3.8 degrees (P=0.4) and the inferior angle increased from 4.75+/-2.0 to 7.9+/-3.7 degrees (P=0.1). The mean ACD increased from 2.19+/-0.36 to 2.30+/-0.36 mm in PAC group (P=0.0003), with no significant change seen in the PACG group (1.79+/-0.32 vs 1.82+/-0.33 mm, P=0.13). CONCLUSION: LPI leads to a widening of the anterior chamber angle and a deepening of the anterior chamber in eyes with PAC. It does not significantly change any anterior segment parameters in eyes with PACG.     

Ultrasound biomicroscopic quantification of the change in anterior chamber angle following laser peripheral iridotomy in early chronic primary angle closure glaucoma

AIMS: To prospectively evaluate by ultrasound biomicroscopy (UBM) and gonioscopy the anterior chamber angle widening following laser peripheral iridotomy (LPI) in eyes with early chronic primary angle closure glaucoma (CACG). METHODS: A total of 55 eyes of 55 patients with CACG presenting with less than 180 degrees peripheral anterior synechiae (PAS) were enrolled in the study. Angles were assessed by gonioscopy (Shaffer's grading) and UBM, before and 4 weeks after LPI. The angle opening distance at 250 and 500 microm from the scleral spur (AOD 250 and AOD 500) was computed. Results were analysed using the Wilcoxon signed-rank test. RESULTS: In the quadrant with LPI, the mean gonioscopy grade increased significantly from 0.45 to 1.45 (P<0.001) and the mean AOD 250 and AOD 500 increased from 38.5+/-25.9 to 83.5+/-48.4 microm (P<0.001) and 110.2+/-80.9 to 170.6+/-83.4 microm (P<0.001), respectively. The angles widened significantly in the opposite quadrant on UBM (AOD 250: 48.8+/-31.5-82.7+/-43.9 microm, P<0.001; AOD 500:117.2+/-65.5-172.2+/-81.7 microm; P<0.001), but the median gonioscopy grade remained unchanged. CONCLUSIONS: LPI significantly widened the anterior chamber angle in the quadrant with LPI and the quadrant furthest away in patients of CACG with established glaucomatous damage. This change was much better appreciated by the UBM than gonioscopy.     

超声生物显微镜在青光眼白内障联合手术中的应用

目的:利用超声生物显微镜(ultrasound biomicroscope,UBM)检查的结果来指导青光眼合并白内障患者术前手术方法的选择,观察患者术后房角及其相关结构的改变。方法:对合并白内障的原发性闭角型青光眼(primary angle closure glaucoma,PACG)患者30例(30眼)行小梁切除术联合白内障小切口手法碎核晶状体摘除及人工晶状体植入。术前及术后1mo常规行视力、裂隙灯、用UBM测量前房深度(anterior chamber distance,ACD)、小梁虹膜角(tra-becular iris angle,TIA)、房角开放距离500(angle opening dis-tance,AOD500)、小梁睫状体距离(trabecular ciliary proces-ses distance,TCPD)和虹膜厚度1(iris distance,ID1)的检查,同时记录眼压的变化并进行分析。结果:术后眼压较术前明显降低。ACD、TIA、AOD500、TCPD术前术后比较均有显著性差异(P<0.05)。ID1术前术后比较无显著性差异。结论:青光眼白内障联合手术可明显加深前房,增宽房角,重新开放小梁网。远期效果待于更多样本、更长时间的术后观察。     

Ultrasound biomicroscopic study of anterior segment changes after phacoemulsification and foldable intraocular lens implantation

PURPOSE: To report quantitative changes in the anterior segment configuration after clear corneal incision phacoemulsification and foldable intraocular lens (IOL) implantation by means of ultrasound biomicroscopy (UBM). DESIGN: Prospective, nonrandomized, comparative (self-controlled) trial. PARTICIPANTS: Twenty-one eyes of 19 patients with senile or presenile cataracts and no other ocular illness. METHODS: Patients were examined with UBM before and 1 and 3 months after surgery. At each UBM examination, axial images of the anterior chamber and radial sections of the angle at the superior, lateral, inferior, and medial quadrants were obtained. MAIN OUTCOME MEASURES: Central anterior chamber depth (ACD), iris-lens contact distance, iris-lens angle (ILA), angle opening distance at points 250 (AOD250) and 500 microm (AOD500) from the scleral spur, trabecular-iris angle (TIA), iris thickness 500 microm from the scleral spur (IT), trabecular-ciliary process distance (TCPD), iris-ciliary process distance (ICPD), iris-zonule distance, iris-sclera angle (ISA), and ciliary process-sclera angle (CPSA). After surgery, central anterior chamber depth was also measured from the cornea to the IOL (ACD) and from the cornea to the pupillary plane (ACD2). Each variable was measured twice in different days by the same observer. RESULTS: The variables IT, TCPD, ICPD, IZD, and CPSA did not significantly change after surgery (P > 0.01). Central anterior chamber depth increased approximately 30% after surgery (approximately 850 microm; P < 0.001), by both measurement methods used (ACD x ACD and ACD x ACD2). Anterior chamber angle significantly increased, by approximately 50% of the initial value, by the three measurement methods used: AOD250 (P 相似文献   

房角狭窄和虹膜参数的相关性

目的　定量分析虹膜参数与房角狭窄的相关关系。方法　本研究是以医院人群为基础的横断面研究,分为房角狭窄组和正常对照组。所有入选研究对象均进行超声生物显微镜（ｕｌｔｒａｓｏｕｎｄｂｉｏｍｉｃｒｏｓｃｏｐｙ,ＵＢＭ）检查,将采集到的ＵＢＭ图像存储并做进一步定量分析。测量的参数包括:中央前房深度（ｃｅｎｔｒａｌａｎｔｅｒｉｏｒｃｈａｍｂｅｒｄｅｐｔｈ,ＡＣＤ）、前房宽度（ａｎｔｅｒｉｏｒｃｈａｍｂｅｒｗｉｄｔｈ,ＡＣＷ）、房角开放距离（ａｎｇｌｅｏｐｅｎｄｉｓｔａｎｃｅ,ＡＯＤ）、虹膜膨隆度（ｉｒｉｓｃｕｒｖａｔｕｒｅ,ＩｒｉｓＣ）、虹膜厚度５００（ｉｒｉｓｔｈｉｃｋｎｅｓｓ５００,ＩＴ５００）、虹膜厚度１５００（ｉｒｉｓｔｈｉｃｋｎｅｓｓ１５００,ＩＴ１５００）、虹膜根部附着点距离（ｉｒｉｓｒｏｏｔｄｉｓｔａｎｃｅ,ＩｒｉｓＤ）。结果　共纳入研究对象１８７例,包括房角狭窄眼１０２例（５４．５％）和正常对照８５例（４５．５％）。房角狭窄组的ＡＣＤ、ＡＣＷ、ＡＯＤ和ＩｒｉｓＤ分别为（２．０９±０．２３）ｍｍ、（１１．２８±０．４１）ｍｍ、（０．０８６±０．０８３）ｍｍ、（０．０８６±０．０９３）ｍｍ,均较正常对照组的（２．６９±０．３２）ｍｍ、（１１．４９±０．３８）ｍｍ、（０．２７９±０．１３４）ｍｍ、（０．１８５±０．１０５）ｍｍ小,差异均有统计学意义（均为Ｐ＜０．０１）;而房角狭窄组的ＩｒｉｓＣ、ＩＴ５００和ＩＴ１５００分别为（０．３６５±０．１２４）ｍｍ、（０．４９２±０．０９７）ｍｍ、（０．５３２±０．０８１）ｍｍ,均较正常对照组的（０．２５６±０．１０９）ｍｍ、（０．４５３±０．０８２）ｍｍ、（０．４９４±０．０７９）ｍｍ大,差异均有统计学意义（均为Ｐ＜０．０１）。相关性分析和多元逐步回归分析显示ＡＣＤ、ＡＣＷ、ＩｒｉｓＣ、ＩＴ５００和ＩｒｉｓＤ与ＡＯＤ有显著的相关关系。结论　房角狭窄眼与ＩｒｉｓＣ高、周边虹膜肥厚和虹膜根部附着点靠前相关。