Pseudophakic Malignant Glaucoma Treatment Assisted with Anterior Segment Optical Coherence Tomography: A Case Report

PSEUDOPHAKIC malignant glaucoma is diagnosedbased on the presence of a shallow or flat centraland peripheral anterior chamber in the presenceof patent iridectomy, with intraocular pressure（IOP） of 22 mm Hg or more after lens extraction andintraocular lens implantation.1 Pseudophakic malignantglaucoma is one of the most challenging complicationsfaced by surgeons. Initial medication includes topicalcycloplegics, osmotic agents.

Comparison of Anterior Segment Optical Coherence Tomography and Ultrasound Biomicroscopy for Iris Parameter Measurements in Patients with Primary Angle Closure Glaucoma

Purpose: To compare the repeatability and consistency of anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM) in measuring iris parameters in patients with primary angle closure glaucoma. Methods: Twenty-two patients (38 eyes) with primary angle closure glaucoma,including 5 eyes with acute angle closure glaucoma,10 fellow eyes of acute angle closure glaucoma, and 23 eyes with chronic angle closure glaucoma, were recruited consecutively in our hospital. All subjects underwent anterior scanning by AS-OCT and UBM. Peripheral iris thickness (PIT) and iris curvature (IC) in the anterior segment image obtained by AS-OCT and UBM were measured twice. The reproducibility of these two scans was evaluated by the intraclass correlation coefficient (ICC). A paired t-test was used to compare the difference between the two scans and the 95% limits of agreement (LoA) were calculated. Results:The ICCs of PIT and IC measured by UBM were 0.892 and 0.936 respectively, while for AS-OCT these values were 0.629 and 0.859, respectively. UBM had a higher reproducibility in both PIT and IC measurements as compared with AS-OCT.Differences in PIT measurement between AS-OCT and UBM(P=0.331).were not statistically significant, the 95% LoA (-0.178～0.156) mm was 36.1～41.2% of the mean. The IC was 0.053 mm smaller when measured by UBM than by AS-OCT (P=0.017), with the 95% LoA (-0.100～0.206) mm, or 36.2～74.6% of the mean.Conclusion:UBM had a higher reproducibility in measuring iris parameters than AS-OCT. The consistency between AS- OCT and UBM in measuring iris parameters was low in primary angle closure glaucoma patients. (Eye Science 2013; 28:1-6)

Anterior segment optical coherence tomography for identifying muscle status in strabismus surgery

Anterior segment optical coherence tomography （AS-OCT） finds very few indications in the domain of strabismus surgery. Current applications remain restricted to determining limbus-muscle insertion distance and anterior segment changes after strabismus surgery. We discuss two cases of operated strabismus surgery where AS-OCT imaging helped in identifying the operated eye and/or extra ocular muscles （EOM） and thus proved instrumental in planning and management.

Lens thickness assessment : anterior segment optical coherence tomography versus A-scan ultrasonography

AIMTo assess lens thickness measurements with anterior segment-optical coherence tomography (AS-OCT) in comparison with A-scan ultrasonography (A-scan US).METHODSThere were 218 adult subjects (218 eyes) aged 59.2±9.2y enrolled in this prospective cross-sectional study. Forty-three eyes had open angles and 175 eyes had narrow angles. Routine ophthalmic exam was performed and nuclear opacity was graded using the Lens Opacities Classification System III (LOCS III). Lens thickness was measured by AS-OCT (Visante OCT, Carl Zeiss Meditec, Dublin, CA, USA). The highest quality image was selected for each eye and lens thickness was calculated using ImageJ software. Lens thickness was also measured by A-scan US.RESULTSInterclass correlations showed a value of 99.7% for intra-visit measurements and 95.3% for inter-visit measurements. The mean lens thickness measured by AS-OCT was not significantly different from that of A-scan US (4.861±0.404 vs 4.866±0.351 mm, P=0.74). Lens thickness values obtained from the two instruments were highly correlated overall (Pearson correlation coefficient=0.81, P<0.001), and in all LOCS III specific subgroups except in grade 5 of nuclear opacity. Bland-Altman analysis revealed a 95% limit of agreement from -0.45 to 0.46 mm. Lens thickness difference between the two instruments became smaller as the lens thickness increased and AS-OCT yielded smaller values than A-scan US in thicker lens (β=-0.29, P<0.001)CONCLUSIONAS-OCT-derived lens thickness measurement is valid and comparable to the results obtained by A-scan US. It can be used as a reliable noncontact method for measuring lens thickness in adults with or without significant cataract.

Application of Tear Meniscus Measurement by Anterior Segment Optical Coherence Tomography in the Diagnosis of Dry Eye

Dry eye,one of the most frequent ocular surface diseases, is caused by complex ocular function and mechanism disorders. Currently, no uniform standard diagnosis of dry eye has been established. Traditional clinical examinations provide inaccurate measurement and poor reproducibility due to various factors.Anterior segment optical coherence tomography (OCT) is applicable in the diagnosis of dry eye due to its high resolution, non-invasiveness, good accuracy, and repeatability.

Comparison of Intraoperative Ultrasound Pachymetry and Postoperative Optical Coherence Tomography of Anterior Segment in the Measurement of Flap Thickness in Eyes Receiving Laser in situ Keratomileusis

Purpose:To compare the measurement of flap thickness using intraoperative ultrasound pachymetry and postoperative visante anterior segment optical coherence tomography (Visante-OCT) in eyes receiving laser in situ keratomileusis (LASIK). Methods: Seventeen patients (34 eyes) received LASIK using a Technolas-217Z100 laser and AMADEUSⅡ mechanical microkeratome(140 μm head). Flap thickness was assessed with an ultrasound pachymeter intraoperatively and a Visante-OCT postoperatively at 1 week and 1 month. Results: The intraoperative mean flap thickness by ultrasound pachymetry was (124±13.9) μm (range: 96.5 to 160 μm), and mean flap thickness by Visante-OCT was (145±7.13) μm (range: 130 to 158 μm) and (143±5.32) μm (range: 132 to 155 μm) postoperatively at 1 week and 1 month respectively (F=63.52,P<0.01). Intraoperative subtraction pachymetry underestimated flap thickness compared with postoperative Visante-OCT.(P<0.01)..There was no significant difference between postoperative Visante-OCT measurements at 1 week and 1 month after LASIK.(P=0.16). The 95% limit of agreement.(LoA).of flap thickness between ultrasound Visante-OCT and pachymetry was -5.40 to 42.10 μm. Conclusion: OCT overestimates flap thickness compared with intraoperative ultrasound pachymetry when using the AMADEUSⅡ mechanical microkeratome.

Evaluation of the iridocorneal angle with accommodation using optical coherence tomography

The changes in the iridocorneal angle structure during accommodation are assessed by means of anterior segment optical coherence tomography.Thirteen right eyes were included in the study.The device used for the measurement was the Visante？omni system.The stimuli were set up at different vergences（0.0 D,-1.5 D,and-3.0 D）.The angle opening distance 500 and 750,the trabecular iris space area 500 and 750,and the scleral spur angle parameters were assessed at the nasal and temporal regions.The results in the iridotrabecular angle comparing the three accommodative states of the eye did not yield any statistically significant difference at nasal or temporal angle sections.In light of our results and in the conditions of our study,the structures of the iridocorneal angle are not significantly changed with accommodation.

Anterior and posterior segment structural features of acute primary angle-closure eyes:date based on AS-OCT and SS-OCT

Background:To measure the anterior and posterior segment structural features of acute primary angle-closure(APAC)eyes.Methods:A total of 36 subjects with unilateral APAC were recruited in this study.The ocular biometric characteristics were measured by anterior segment optical coherence tomography(AS-OCT)and swept source optical coherence tomography(SS-OCT),respectively at baseline,2 weeks,and 1 month after surgical intervention.Results:At baseline,when compared with the fellow eyes,APAC-affected eyes showed significantly greater corneal thickness(P=0.004),shallower anterior chamber depth(ACD)(P<0.001),smaller anterior chamber area(ACA)(P=0.013),angle opening distance at 750μm from the scleral spur(AOD750)(P=0.002),trabecular-iris space area at 750μm from the scleral spur(TISA750)(P=0.033),angle recess area(ARA)(P=0.014),and iris area(IARE)(P=0.003),less iris curvature(ICURVE)(P=0.003),and larger lens vault(LV)(P=0.030).After intervention,the corneal thickness was significantly decreased at 1 month(P<0.001),while ACD,ACA,and AOD750 were significantly increased at 2 weeks and 1 month(all P<0.017).Changes in ACD were correlated with decreasing LV(P<0.05).The posterior segment parameters did not change over the 4-week period.Conclusions:When compared with the fellow eyes,APAC-affected eyes had greater corneal thickness,shallower anterior chamber,narrower angle,less ICURVE,and larger LV.After intervention,the corneal thickness was decreased,while the shallower anterior chamber was relieved to some extent.

Measurement of anterior chamber volume with rotating scheimpflug camera and anterior segment optical coherence tomography

Background Measurement of anterior segment parameters plays an important role in diagnosis and treatment of glaucoma. The objective of this study was to evaluate the repeatability and reproducibility of anterior chamber volume （ACV） measurements with rotating scheimpflug camera （RSC） and to examine agreement with anterior segment optical coherence tomography （AS-OCT）. Methods Thirty nine healthy normal subjects were recruited from the Eye Center of Tongren Hospital. ACV was measured using RSC and AS-OCT in a randomly selected eye for each subject. For RSC measurements, both automatic and manual ACV measurements and 2 independent operators＇ ACV measurements were obtained. All subjects were invited for 3 visits within a week to evaluate repeatability and reproducibility of ACV measurement by RSC. Agreement was evaluated between RSC and AS-OCT. Results Good repeatability and reproducibility were found for both automatic and manual ACV measurements obtained by RSC. For intrasession repeatability, coefficient of variation （CVw） and intraclass correlation coefficient （ICC） values for automatic were 3.52% and 0.98; the values for manual were 3.44% and 0.97, respectively. For intersession reproducibility, the respective CVw and ICC values were 3.96% and 0.96. Good agreement was also found in 2 operators for both automatic and manual ACV measurements; nevertheless, poor agreement was found between RSC and AS-OCT （95% confidence interval （CO for agreement of automatic RSC measurement versus AS-OCT were -96.3 to 72.8 pl and 95% CI for agreement of manual RSC measurement versus AS-OCT were between 41.7 to 10.1 #1 ）. Conclusions Both RSC automatic and manual ACV measurements showed good repeatability and reproducibility, and showed comparable agreement between 2 independent operators, but poor agreement was found between RSC and AS-OCT.

Optical coherence tomography angiography for the anterior segment

Optical coherence tomography angiography(OCTA)is a rapid and non-invasive technique for imaging vasculature in the eye.As OCTA can produce high-resolution cross-sectional images and allow depth-resolved analysis for accurate localization of pathology of interest,it has become a promising method for anterior segment imaging.Furthermore,OCTA offers a more patient-friendly alternative to the conventional invasive dye-based fluorescent angiography.However,conventional OCTA systems are typically designed and optimized for the posterior segment of the eye,and thus using OCTA for anterior segment imaging can present several difficulties and limitations.In this review,we summarized the recent developments and clinical applications in anterior segment OCTA(AS-OCTA)imaging,such as for the cornea,iris,sclera and conjunctiva.We also compared commercially available OCTA systems,discussed the limitations of adapting current OCTA technology for the anterior segment imaging,and proposed possible future directions for AS-OCTA systems.AS-OCTA provides potential for future clinical applications such as diagnosis of corneal and iris pathologies,pre-operative surgical planning,assessment of new antiangiogenic therapeutics or evaluation of limbal stem cell deficiency.With further development,OCTA for anterior segment imaging in the clinics may become common in the near future.

Evaluation of dry eye disease in newly diagnosed anxiety and depression patients using anterior segment optical coherence tomography

Background:We aimed to evaluate dry eye diseases(DED)in patients with newly diagnosed depression and anxiety patients.Methods:Forty newly diagnosed depression,35 anxiety patients,and 37 controls without any history of taking psychiatric drugs(or before the beginning of psychiatric medication)and topical ophthalmic drop use,were included in the study.All depression and anxiety diagnoses were performed by an experienced psychiatrist.Beck depression and anxiety tests were used to measure disease severity.Tear film break up time(TBUT),Schirmer’s test,Oxford scores and ocular surface disease index(OSDI)were admiinistered to participants.Anterior segment optical coherence tomography was used to measure tear meniscus heights(TMH),tear meniscus depths(TMD)and tear meniscus areas(TMA).Results:In anxiety and depression groups,Schirmer’s test(mm)(7.24±6.02,6.58±4.9 and 18.79±4.9 respectively,p<0.05)and TBUT(s)(5.62±3.1,5.6±3.5 and 13.37±1.7 respectively,p<0.05)were significantly lower than control group.In addition,OSDI and Oxford scores were significantly higher than controls.OSDI scores were 28.01±19,30.43±18.49,14.38±8.14 respectively(p=0.002)and Oxford scores were 1.9±0.7,2.1±0.6 and 0.7±0.4 respectively(p=0.001).TMD,TMH and TMA values were significantly lower in anxiety and depression groups compared with control groups.Correlations between disease inventory scores and dry eye tests were detected.Conclusions:This study showed a relation between DED and newly diagnosed anxiety and depression patients with no history of psychiatric drug use.The presence of correlation between dry eye tests and disease inventory scores strengthens this association.This is an important knowledge that need to be evaluated in these patients before starting psychiatric medication.

Fast segmentation of anterior segment optical coherence tomography images using graph cut

Background:Optical coherence tomography(OCT)is a non-invasive imaging system that can be used to obtain images of the anterior segment.Automatic segmentation of these images will enable them to be used to construct patient specific biomechanical models of the human eye.These models could be used to help with treatment planning and diagnosis of patients.Methods:A novel graph cut technique using regional and shape terms was developed.It was evaluated by segmenting 39 OCT images of the anterior segment.The results of this were compared with manual segmentation and a previously reported level set segmentation technique.Three different comparison techniques were used:Dice’s similarity coefficient(DSC),mean unsigned surface positioning error(MSPE),and 95%Hausdorff distance(HD).A paired t-test was used to compare the results of different segmentation techniques.Results:When comparison with manual segmentation was performed,a mean DSC value of 0.943±0.020 was achieved,outperforming other previously published techniques.A substantial reduction in processing time was also achieved using this method.Conclusions:We have developed a new segmentation technique that is both fast and accurate.This has the potential to be used to aid diagnostics and treatment planning.

The use of high resolution anterior segment optical coherence tomography for the characterization of conjunctival lymphoma, conjunctival amyloidosis and benign reactive lymphoid hyperplasia

Background:Conjunctival lymphoma,conjunctival amyloidosis and benign reactive lymphoid hyperplasia(BRLH)are conditions that often have a similar appearance on the ocular surface.The use of high resolution anterior segment optical coherence tomography(HR-OCT)enables clinicians to evaluate distinctive differences in tissue morphology and cellular patterns in various ocular surface conditions.In this study,we characterize the morphological differences seen in conjunctival lymphoma,conjunctival amyloidosis and BRLH on HR-OCT imaging.Methods:A retrospective chart review was performed of patients with biopsy proven conjunctival lymphoma,conjunctival amyloidosis and BRLH between 2012 and 2019 at the Bascom Palmer Eye Institute.Patients were excluded if HR-OCT imaging was not performed on initial presentation.Results:Thirty-four total eyes of 27 patients were identified.Twenty eyes had conjunctival lymphoma(16 patients),8 eyes had conjunctival amyloidosis(6 patients)and 6 eyes had BRLH(5 patients).All conditions appeared clinically as pink,red or yellow subepithelial lesions but had different features on HR-OCT.In lymphoma,HR-OCT images typically showed homogenous,dark subepithelial lesions with smooth borders,containing monomorphic dot-like infiltrates.HR-OCT images of amyloidosis typically showed heterogeneous,dark lesions with irregular borders,often containing hyperreflective linear infiltrates.HR-OCT images of BRLH showed variable infiltration of the subepithelial tissue,at times with homogenous lesions containing dot-like infiltrates like lymphoma and other times with more hyperreflective,subepithelial tissue.Flow cytometry and gene rearrangement was needed for final differentiation between BRLH and lymphoma lesions.Conclusions:Distinctive features on HR-OCT of conjunctival lymphoma,conjunctival amyloidosis and BRLH can help characterize these lesions beyond what is apparent with the clinical examination.Future studies can further validate this technology’s use with more subtle and challenging lesions.

基于AS-OCT图像的核性白内障多级排序分类算法研究

目的探讨基于眼前节光学相干断层扫描(AS-OCT)图像的核性白内障智能辅助分级算法对白内障分级的诊断价值。方法采用诊断试验研究方法,收集2020年11月至2021年9月间同济大学附属第十人民医院电子病例系统中核性白内障患者939例1608眼的AS-OCT图像资料,所有资料均符合临床阅片清晰度要求。其中男398例664眼,女541例944眼,年龄18~94岁,平均年龄(65.7±18.6)岁。由3名经验丰富的临床医生基于晶状体混浊分类系统(LOCSⅢ分级系统),对所收集的AS-OCT图像进行1~6级人工标注。构建一种基于多级排序的全局-局部白内障分级算法,该算法包含5个基本的二元分类全局-局部网络(GL-Net),每个GL-Net聚合白内障核区域、原始图像等多尺度信息进行核性白内障分级。基于消融实验和模型对比试验,采用准确率、精确率、灵敏度、F1指标及Kappa系数对模型性能进行评价,且所有结果均通过五折交叉验证。结果模型在核性白内障数据集上的准确率、精确率、灵敏度、F1、Kappa分别为87.81%、88.88%、88.33%、88.51%、85.22%。消融实验结果表明,ResNet18结合局部特征和全局特征进行多级排序分类,模型在准确率、精确率、灵敏度、F1、Kappa指标上均有提升。与ResNet34、VGG16、Ranking-CNN、MRF-Net模型比较,本研究模型各性能指标均有提升。结论基于深度学习的AS-OCT核性白内障图像多级排序分类算法对白内障分级具有较高的准确度,有望辅助提高眼科医生对核性白内障的诊断精度以及效率。

光学相干断层扫描血管成像在眼前节疾病中的研究现状

光学相干断层扫描血管成像(OCTA)是一种新型非侵入性快速成像技术,与当前的眼前节成像技术相比,OCTA具有快速、无创、无染料等优势。此外,与频域OCTA相比,最新的扫频OCTA信噪比更强、穿透力更高、波长更长,能够检测更深层次的血管结构,获得更高分辨率的精准血流成像。OCTA主要应用于视网膜血管成像,进行眼前节成像时需要安装眼前节适配器透镜。近年来,OCTA应用于眼前节疾病的研究日益增多,本文将对OCTA在结膜、巩膜、角膜及虹膜等眼前节疾病中的应用进行综述。同时比较频域OCTA和扫频OCTA在眼前节疾病中的应用,并对其局限性进行讨论。

Scansys、Pentacam、CASIA和Arcscan测量近视眼ICL植入术后拱高比较

目的评估国产三维眼前节分析系统Scansys、Pentacam三维眼前节全景分析仪、频域眼前节光学相干断层扫描仪(CASIA SS-1000)和新型超高频数字超声扫描系统(Arcscan Insight100)测量近视眼有晶状体眼后房型人工晶状体(ICL)植入术后中央拱高的差异及一致性。方法采用诊断试验研究方法,纳入2019年6—12月于河南省人民医院眼科行ICL V4c植入术的近视患者56例56眼,术后同时应用Scansys、Pentacam、CASIA和Arcsan测量中央拱高。比较4种仪器拱高测量值的差异;4种仪器拱高测量值的相关性采用Pearson相关性分析,一致性比较采用Bland-Altman法分析。结果Scansys、Pentacam、CASIA和Arcscan拱高测量值分别为(481.8±191.6)、(476.4±190.6)、(619.3±207.5)和(534.0±221.2)μm,总体比较差异有统计学意义(F=143.301,P<0.001),其中Scansys和Pentacam拱高测量值明显低于CASIA和Arcscan,Arcscan拱高测量值低于CASIA,差异均有统计学意义(均P<0.001)。Arcscan-CASIA、Arcscan-Pentacam、Arcscan-Scansys、CASIA-Pentacam、CASIA-Scansys、Pentacam-Scansys拱高测量值均呈强正相关(r=0.982、0.933、0.931、0.942、0.941、0.989,均P<0.001)。Scansys、Pentacam、CASIA和Arcscan拱高测量值组内相关系数分别为0.985、0.975、0.998、0.992;CASIA和Arcscan、CASIA和Scansys、CASIA和Pantacam、Arcscan和Scansys、Arcscan和Pantacam拱高测量值差值95%一致性界限分别为-170~0、0~280、0~280、-110~210、-100~220μm,差值的绝对值最大值超出临床的可接受范围,一致性欠佳;Scansys和Pentacam拱高测量值差值95%一致性界限为-60~50μm,一致性良好。结论4种仪器测量近视眼ICL V4c植入术后拱高重复性均良好,其中,Scansys和Pentacam的拱高测量值偏小,两者一致性良好,结果可以互相替代;而CASIA拱高测量值最大,其次为Arcscan,彼此差异较大,测量结果不能相互替代,在临床工作中应结合实际情况综合分析。

Advances in swept-source optical coherence tomography and optical coherence tomography angiography

Background:The fast development of swept-source optical coherence tomography(SS-OCT)and swept-source optical coherence tomography angiography(SS-OCTA)enables both anterior and posterior imaging of the eye.These techniques have evolved from a research tool to an essential clinical imaging modality.Main text:The longer wavelength and faster speed of SS-OCT and SS-OCTA facilitate better visualization of structure and vasculature below pigmented tissue with a larger field of view of the posterior segment and 360-degree visualization of the anterior segment.In the past 10 years,algorithms dealing with OCT and OCTA data also vastly improved the image quality and enabled the automated quantification of OCT-and OCTA-derived metrics.This technology has enriched our current understanding of healthy and diseased eyes.Even though the high cost of the systems currently limited the widespread use of SS-OCT and SS-OCTA at the first beginning,the gap between research and clinic practice got obviously shortened in the past few years.Conclusions:SS-OCT and SS-OCTA will continue to evolve rapidly,contributing to a paradigm shift toward more widespread adoption of new imaging technology in clinical practice.

面向白内障识别的临床特征校准注意力网络

近年来,卷积神经网络(convolutional neural network,CNN)模型已经被广泛用于年龄相关性白内障自动分类任务,然而,鲜有研究工作将年龄相关性白内障的临床先验知识注入卷积神经网络架构设计中,以此来提高年龄相关性白内障的分类效果和改善模型决策过程的可解释性。提出了一种临床特征校准注意力网络(clinical feature recalibration attention network,CFANet)模型用于自动识别年龄相关性白内障严重级别。在CFANet中,设计了一个简单且有效的临床特征校准注意力模块(clinical feature recalibration attention block,CFA),其不仅能对不同临床特征类型进行自适应地加权融合,还通过门控操作符来突出重要通道和抑制不重要通道。在一个核性白内障的眼前节光学相干断层成像影像(anterior segment optical coherence tomography,AS-OCT)数据集和一个公开眼科影像数据集上进行了充分实验,实验结果表明,相较于squeeze-and-excitation network(SENet)、efficient channel network(ECANet)、style-based recalibration module(SRM),CFANet在AS-OCT数据集上的分类准确率至少提升了3.54个百分点,同时在公开的眼科影像数据集上的分类结果比先进的神经网络模型和已发表的研究工作提升了1个百分点以上。此外,还通过可视化方法分析临床特征的权重分布和通道的注意力权重分布来提高该文模型决策过程的可解释性。

Assessment of anterior chamber angle changes after phacoemulsification with swept-source OCT

AIM:To assess the changes of anterior chamber angle in patients with shallow anterior chamber after phacoemulsification combined with intraocular lens(IOL)implantation,based on anterior segment swept-source optical coherence tomography(AS-SS-OCT)measurements.METHODS:This was a prospective case control study;sixty eyes of sixty case were scheduled for cataract surgery with normal intraocular pressure(IOP).Based on anterior chamber depth(ACD)and gonioscopy findings,the eyes were divided into two groups:group of shallow anterior chamber and narrow angle(SAC group,30 eyes);and group of normal anterior chamber group with wide angle(NAC group,30 eyes).Measurements of ACD,anterior chamber volume(ACV),iris volume(IV),lens vault(LV),angle opening distance(AOD),angle recess area(ARA),trabecular iris space area(TISA),and trabecular iris angle(TIA)were conducted in each group before and 3mo after surgery.RESULTS:There was no significant difference in age,axial length(AL),corneal curvature,corneal diameter,intraocular pressure,and IV between two groups before surgery,except for the LV(P=0.000).ACD and ACV were prominently larger in the NAC group than the SAC group 3mo after operation(3.69±0.38 vs 3.85±0.39 mm,P=0.025;161.37±19.47 vs 178.26±20.30 mm3,P=0.002).AOD750,ARA750 in nasal and inferior quadrants,TISA750 in all quadrants except temporal,and TIA750 in all quadrants in SAC group were significantly smaller than those in NAC group after operation(all P<0.05).CONCLUSION:Cataract surgery can deepen anterior chamber and increase the width of anterior chamber angle in Chinese subjects,but the angle related parameters including AOD750,ARA750,TISA750,TIA,TISA750,and ACV in patients with shallow anterior chamber and narrow angle do not reach the normal level.

基于SS-OCT分析眼轴长度与眼前节参数的相关性

目的:利用扫频源光相干断层扫描成像(SS-OCT)观察与探讨眼轴长度(AL)与眼前节相关参数的相关性。方法:横断面临床研究,纳入2022-01-01/03-31在郑州大学第一附属医院眼科门诊招募的不同程度近视的成人志愿者109例,依据AL将受检者分为4组:A组(AL≤24.0mm)、B组(24.0mm26.0mm)。SS-OCT(视微影像)进行眼前节检查,对中央角膜厚度(CCT)、晶状体厚度(LT),前房参数:中央前房深度(ACD)、前房宽度(ACW)、房角开放距离(AOD500)、房角隐窝面积(ARA500)、小梁网-虹膜间面积(TISA500)、小梁虹膜夹角(TIA500),晶状体矢高(CLR)进行记录,并分析其与AL、等效球镜度数(SE)的关系。结果:四组CCT比较无差异(P>0.05)。四组SE、LT、ACD、ACW、AOD500、ARA500、TISA500、TIA500、CLR比较有差异(均P<0.01)。SE、LT与AL呈负相关(r=-0.75、-0.41,均P<0.01);ACD、ACW、CLR与AL呈正相关(r=0.58、0.45、0.54,均P<0.01);AOD500、ARA500、TISA500、TIA500(颞侧及鼻侧)与AL呈正相关(均P<0.01)。ACD、CLR与SE呈负相关(r=-0.21、-0.25,均P<0.01),LT与SE呈正相关(r=0.21,P<0.05)。结论:随着AL的增加CCT无明显改变,ACD、ACW及房角开放程度则增加,晶状体位置后移,LT变薄。