Analysis of bleb morphology after trabeculectomy with Visante anterior segment optical coherence tomography

BACKGROUND: To describe the use of anterior segment optical coherence tomography (OCT) in imaging intrableb morphology after trabeculectomy. METHODS: 14 post-trabeculectomy eyes from 11 primary open angle glaucoma and 3 primary angle closure glaucoma subjects were studied. The blebs were classified with reference to slit lamp morphology and bleb function. They included diffuse filtering (n = 7), cystic (n = 2), encapsulated (n = 2) and flattened (n = 3) bleb types. One eye in each patient was imaged with the Visante anterior segment OCT. A vertical scan line of 10 mm consisting of 512 A-scans was positioned at the centre of the bleb. The images were then analysed by built-in software. Intrableb morphologies and structures, including bleb wall thickness, subconjunctival fluid collections, suprascleral fluid space, scleral flap thickness, intrableb intensity (low, medium or high) and the route under the scleral flap were characterised and measured. RESULTS: Diffuse filtering blebs were found by subconjunctival fluid collections. Suprascleral fluid space and the route under the scleral flap were identified in four of the seven cases. Cystic blebs were composed of a large hyporeflective space with multiloculated fluid collections covered by a thin layer of conjunctiva. Encapsulated blebs had a thick bleb wall with high reflectivity and an enclosed fluid filled space. Flattened blebs demonstrated high scleral reflectivity and no bleb elevation. CONCLUSIONS: Visante anterior segment OCT can be used for bleb imaging. The different patterns of intrableb morphology identified by OCT were related to slit lamp appearance and bleb function. This information may be useful to study the different surgical outcomes and the process of wound healing in trabeculectomised eyes.     

Optical coherence tomography and scleral contact lenses: clinical and research applications

Anterior segment optical coherence tomography (OCT) provides a wealth of opportunities for modern contact lens practice. OCT imaging has numerous clinical and research applications related to the tear film, cornea, conjunctiva, sclera and ocular adnexae, in addition to soft, rigid, and hybrid contact lenses. This review summarises the potential use of OCT imaging in modern scleral contact lens practice including initial lens selection, assessing the scleral contact lens fit with respect to the cornea and sclera, and accurately quantifying the ocular response to lens wear. Recent advances in the understanding of anterior segment metrics including scleral thickness, curvature, toricity, and the anatomy of the corneoscleral limbal junction are also discussed.     

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。     

1310 nm傅里叶域眼前节OCT的成像特点及与其他两种OCT的对比分析

目的 探讨1310 nm傅里叶域实时眼前节光学相干断层扫描(OCT)的成像特点及与RTV-ue100 OCT,Visante OCT对眼前节重要结构的成像能力的对比.方法 横断面研究.选择受试者6例(12眼,24个方位),运用1310 nm傅里叶域实时眼前节OCT,RTV-ue100 OCT与Visante OCT进行房角成像,对巩膜突、Schlemm's管、房角隐窝及Schwalbe线进行定义,测量前房角角度(TIA500)、500 μm前房角开放距离(AOD500)、500 μm小梁虹膜面积(TISA500)、Schlemn's管长径以及面积.运用Fisher's确切概率法对比3台仪器对房角重要结构的定义能力,并采用独立样本t检验研究三者生物学测量结果的差异.结果 傅里叶域实时眼前节OCT可在8眼(67％)13方位(54％)、12眼(100％)22方位(92％)、12 眼(100％)24方位(100％)及6眼(50％)9方位(38％)分别定义巩膜突、Schlemm's管、房角隐窝及Schwalbe线.RTV-ue100 OCT可于8眼(67％)8方位(33％)定义Schlemm's管,10眼(83％)19方位(79％)定义Schwalbe线,不能定义巩膜突与房角隐窝.Visante OCT于12眼(100％)21方位(88％)定义巩膜突,12眼(100％)24方位(100％)定义房角隐窝,不能定义Schlemm's管与Schwalbe线.3种OCT对巩膜突、Schlemm's管、房角隐窝、Schwalbe线定义能力差异有统计学意义(F=24.30、25.20、28.22、17.10,P＜0.01).傅里叶域实时眼前节OCT与Visante OCT测量TIA500、AOD500、TISA500的差异无统计学意义.傅里叶域实时眼前节OCT与RTV-ue100 OCT测量Schlemm's管面积、长径差异无统计学意义.结论 三种OCT都实现了前房角的清晰成像,显示角膜、巩膜、结膜以及巩膜突、Schlemm's管与Schwalbe线等房角结构.RTV-ue OCT和傅里叶域实时眼前节OCT的图像分辨率较高,能够显示Schlemm’s管与Schwalbe线等细微结构;Visante OCT和傅里叶域实时眼前节OCT深层结构检测能力强,各设备所得生物学参数无明显差异.     

Experimental imaging of intracorneal ring segments with optical coherence tomography

PURPOSE: To investigate the imaging of corneal structures with optical coherence tomography (OCT) after implantation of intracorneal ring segments (ICRS). METHODS: In an experimental study with six porcine eyes, qualitative and quantitative imaging with corneal OCT using a wavelength of 1310 nm after implantation of ICRS was performed. The optical results were compared with light microscopy of the histological sections. RESULTS: In corneal OCT, the ICRS revealed marked hyporeflective intrastromal areas, which correlated well with macroscopic and microscopic findings. Corneal OCT enabled precise images of the incision depth for the implantation of ICRS, and the exact intrastromal segment position. CONCLUSIONS: Noncontact slit lamp-adapted corneal optical coherence tomography could be employed to clinically monitor corneal changes after implantation of ICRS, evaluate the depth of the segments to correlate refractive changes, and quantify the stromal wound healing response.     

Evaluation of the anterior chamber depth after cataract surgery with OCT Visante

INTRODUCTION: OCT Visante allows the visualisation of the anterior segment structures and particularly of the irido-corneal angle by a non-contact method. We made a prospective study on 14 patients to demonstrate by OCT Visante the changes of irido-corneal angle and depth of the anterior chamber after cataract surgery. PATIENTS AND METHODS: 14 eyes of 14 patients have undergone a phacoemulsification of the cataract with posterior chamber lens implantation. All patients have had a complete ophthalmologic examination, an OCT Visante with angle measurement and an A-Scan for determination of the lens thickness. All these exams were repeated at 1 week and 1 month postoperatively. RESULTS: In all patients, we noticed an increase of the postoperative iridocorneal angle. The mean preoperative angle was 18.3 degrees +/- 11.81 SD, 38.65 degrees +/- 3.95 SD at 1 week postoperatively and 45.7 degrees +/- 8.72 SD at 1 month. DISCUSSION: Imagery by OCT Visante allowed us by a non-invasive method to quantify very precisely the opening of the irido-corneal angle and the increase of the anterior chamber depth after cataract surgery. OCT Visante is a method allowing the visualisation and quantification of anterior segment changes after cataract surgery.     

高眼压状态下急性闭角型青光眼术后前部巩膜厚度的研究

目的：：通过超声生物显微镜评估白内障超声乳化吸除联合人工晶状体植入术治疗高眼压状态下急性闭角型青光眼患者术后前部巩膜厚度的改变。方法：采用前瞻性临床研究,收治65例72眼急性闭角型青光眼合并白内障患者,入院时眼压均在50 mmHg以上,经过三种以上降眼压药物治疗眼压仍高于45 mmHg且前房较浅,所有患者行玻璃体腔放液降眼压后再行白内障超声乳化吸出联合人工晶状体植入并房角分离术。对术前及术后1、6 mo的检查结果进行比较分析,通过超声生物显微镜检查前房深度( anterior chamber depth, ACD ),上方、颞侧、鼻侧和下方4个象限前部巩膜厚度( anterior scleral thickness,AST)及距离巩膜突500μm的房角开放距离( angle opening distance at 500μm from the scleral spur, AOD500)观察眼前节结构的变化。结果：患者术前及术后1、6 mo的前房深度分别为1.532±0.316、3.337±0.652、3.458±0.482mm,术后1、6mo患者的前房深度均较术前明显加深(P<0.01),上方、颞侧、鼻侧和下方4个象限前部巩膜厚度较术前均增加,下方及鼻侧巩膜厚度变化有统计学差异(P<0.05),上方及颞侧巩膜厚度变化无统计学差异(P>0.05)。随访期末,上方、颞侧、鼻侧和下方4个象限的AOD500分别较术前平均增加0.007、0.006、0.014和0.019mm,较术前有显著统计学意义(均P<0.01)。结论：对于药物控制不佳的浅前房急性闭角型青光眼患者,白内障手术可以使中央前房加深,前房角增宽,前部巩膜变厚,但是巩膜厚度的改变尚需要更大样本的研究。     

Optical coherence tomography of corneal and scleral melts.

Corneal and scleral melts can be difficult to assess by slit-lamp due to the overlying opacity. The authors demonstrate the role of optical coherence tomography (OCT) in the diagnosis and management of two cases of corneal and scleral melt. A high-speed anterior segment OCT system operating at a 1310-nm wavelength was used. Cross-sectional OCT images showed the depth and extent of the melt. OCT images were obtained through an opaque pannus in one case and through a calcium plaque in the other. OCT images at the follow-up examination revealed a thin fluid space between the amniotic graft and cornea and its subsequent resolution in the first case and the fits of an epicardial graft and a subsequent clear lamellar corneal graft in the second case. OCT images allow physicians to assess melts through opaque media and subsequent graft integration after repair.     

1310 nm傅里叶域眼前节OCT的成像特点及与其他两种OCT的对比分析

目的 探讨1310 nm傅里叶域实时眼前节光学相干断层扫描(OCT)的成像特点及与RTV-ue100 OCT,Visante OCT对眼前节重要结构的成像能力的对比.方法 横断面研究.选择受试者6例(12眼,24个方位),运用1310 nm傅里叶域实时眼前节OCT,RTV-ue100 OCT与Visante OCT进行房角成像,对巩膜突、Schlemm's管、房角隐窝及Schwalbe线进行定义,测量前房角角度(TIA500)、500 μm前房角开放距离(AOD500)、500 μm小梁虹膜面积(TISA500)、Schlemn's管长径以及面积.运用Fisher's确切概率法对比3台仪器对房角重要结构的定义能力,并采用独立样本t检验研究三者生物学测量结果的差异.结果 傅里叶域实时眼前节OCT可在8眼(67％)13方位(54％)、12眼(100％)22方位(92％)、12 眼(100％)24方位(100％)及6眼(50％)9方位(38％)分别定义巩膜突、Schlemm's管、房角隐窝及Schwalbe线.RTV-ue100 OCT可于8眼(67％)8方位(33％)定义Schlemm's管,10眼(83％)19方位(79％)定义Schwalbe线,不能定义巩膜突与房角隐窝.Visante OCT于12眼(100％)21方位(88％)定义巩膜突,12眼(100％)24方位(100％)定义房角隐窝,不能定义Schlemm's管与Schwalbe线.3种OCT对巩膜突、Schlemm's管、房角隐窝、Schwalbe线定义能力差异有统计学意义(F=24.30、25.20、28.22、17.10,P＜0.01).傅里叶域实时眼前节OCT与Visante OCT测量TIA500、AOD500、TISA500的差异无统计学意义.傅里叶域实时眼前节OCT与RTV-ue100 OCT测量Schlemm's管面积、长径差异无统计学意义.结论 三种OCT都实现了前房角的清晰成像,显示角膜、巩膜、结膜以及巩膜突、Schlemm's管与Schwalbe线等房角结构.RTV-ue OCT和傅里叶域实时眼前节OCT的图像分辨率较高,能够显示Schlemm’s管与Schwalbe线等细微结构;Visante OCT和傅里叶域实时眼前节OCT深层结构检测能力强,各设备所得生物学参数无明显差异.     

Implantation of scleral expansion band segments for the treatment of presbyopia

PURPOSE: To assess the effects of scleral expansion band (SEB) segments on accommodative amplitude (primary measure), along with near and distance vision, refraction, pupil size and function, keratometry, axial length, intraocular pressure, contrast sensitivity, stereopsis, and other parameters (secondary measures) in a cohort of 29 emmetropic, presbyopic patients. DESIGN: Multicenter, prospective, nonrandomized, unmasked clinical trial in which the nonoperated eye served as the control. METHODS: Four polymethylmethacrylate segments were surgically implanted in quadrantic scleral pockets created in the dominant eye of 29 emmetropic patients who were between the ages of 51 and 60 (mean age 54). Patients were examined preoperatively and up to 6 months postoperatively. The aforementioned tests were performed on the operated and control eye of each patient. Data were analyzed using two-sided rank tests. Medians, means, and standard deviations are provided for all measurements. RESULTS: Accommodative amplitude was measured monocularly using a near-point "push" technique from both a 70-cm and 30-cm starting point. An increase in accommodative amplitude of surgical eyes by +1.7 +/- 1.5 diopters and +1.5 +/- 1.2 diopters, at these two testing distances, respectively, was noted at 6 months postoperatively (P <.0001). A smaller increase was also seen in control eyes (+1.2 +/- 1.1 diopters and +1.3 +/- 1.2 diopters, respectively). There was notable intercenter variation in gains in accommodation, with three of seven centers showing significant improvement in near-point accommodative amplitudes relative to the others (P =.0003). There was a median improvement of uncorrected near acuity in surgical eyes by 0.3 logarithm of the minimal angle of resolution (logMAR) at 30 and 40 cm and by 4 lines at 20 cm, with the difference in near acuity improvement at 6 months between SEB eyes and control eyes statistically significant at 20 cm (P <.030). Changes in spherical equivalence, axial length, and central keratometry readings were not statistically significant. There were no reports of anterior segment ischemia or malignant glaucoma. Adverse effects were limited to a transient elevation of intraocular pressure in one patient and misalignment of individual SEB segments, due to inadequate scleral pocket formation, in three patients. Only one SEB segment in one eye was replaced. It appears that the thickness and uniformity of the scleral belt loop is critical to the proper positioning and efficacy of the SEB segments. CONCLUSION: While the safety profile of SEB segments for the treatment of presbyopia was high, a modest improvement in near vision was noted in approximately half the patients using subjective methods of testing. The mechanisms that underlie improvement in near vision in the nonoperated eye await explanation. This may be due to a centrally controlled consensual response, potentiated convergence generating increased intravitreal pressure and hydraulic lift of the vitreo-zonular-lens diaphragm, or artifact from current testing techniques. Future studies of the SEB procedure should address the issue of intercenter variation by further standardizing and automating specific aspects of the surgical technique, as well as incorporating objective testing methods into the study design.     

Three-dimensional anterior segment optical coherence tomography of filtering blebs after trabeculectomy

PURPOSE: To evaluate trabeculectomy blebs by using 3-dimensional anterior segment optical coherence tomography (OCT). METHODS: We prospectively examined 4 eyes of 4 patients who developed filtering blebs after trabeculectomy. A 1310-nm high-speed OCT prototype was used to image the 3-dimensional structure of the filtering blebs. RESULTS: The 3-dimensional structure of the filtering blebs was clearly observed in the OCT images. Three types of filtering blebs were observed: diffuse blebs in 2 eyes, an encapsulated bleb in 1 eye, and a nonfunctioning cystic bleb in 1 eye. The volume of each bleb was 9.97, 1.10, 0.76, and 0.88 mm3, respectively. En-face OCT images clearly showed the aqueous outflow channels at the margins of the scleral flaps. CONCLUSION: Three-dimensional OCT allows objective and noninvasive assessment of filtering blebs after trabeculectomy.     

Optical coherence tomography to assess intrastromal corneal ring segment depth in keratoconic eyes

PURPOSE: To investigate intrastromal corneal ring segment depth with a high-speed corneal optical coherence tomography (OCT) system. SETTING: Doheny Eye Institute, University of Southern California, Los Angeles, California, USA. METHODS: A prospective observational case series comprised 4 eyes of 4 patients receiving Intacs intrastromal corneal ring segments (Addition Technology, Inc.) for keratoconus. Optical coherence tomography (OCT) was performed between 7 days and 43 days after implantation. RESULTS: The slitlamp impression of intrastromal corneal ring segment implantation depth did not correlate well with OCT measurements (r(2) = 0.68). The fractional implantation depth was correlated with several surgical variables using a stepwise multivariate regression model, and 2 statistically significant correlations were found. The position of the distal portions of the ring segments was shallower than that of the portion closer to the insertion site (P = .003). Segments placed in the inferior cornea (P = .008) experienced more distal shallowing. Shallower depth was associated with greater fractional anterior stromal compression (P = .04). CONCLUSIONS: Shallower placement of intrastromal corneal ring segments may result in more complications, such as epithelial-stromal breakdown and extrusion, because of the greater anterior stromal tensile strain. The distal and inferior portions of intrastromal corneal ring segments tended to be placed at a shallower depth. Optical coherence tomography provided precise measurement of ring segment depth and may help identify implants that pose a greater risk for depth-related complications.     

白内障超声乳化摘出术后OCT测量的眼前节结构改变

目前,白内障是世界上主要的致盲眼病,其次是青光眼.年龄相关性白内障未成熟期晶状体膨胀,构成闭角性青光眼发生的危险因素,及早进行白内障超声乳化摘出术是解决该危险因素的最佳手段.选择何时进行手术以及预后效果成为困扰临床医师的问题.本研究纳入17篇应用眼前节OCT(AS-OCT)分别对白内障超声乳化摘出术前后眼前节生物测量不同参数进行定量分析的文献,就白内障超声乳化摘出术对眼前节结构的影响进行综合评价.全部文献累计866患眼;随访时间为术后6个月.术后前房深度(ACD)、前房容积(ACV)、前房角度(ACA)、巩膜突起500 μm房角开放距离(AOD500)、AOD750、巩膜突起500 μm小梁与虹膜接触面积(TISA500)、TISA750、巩膜突起750μm房角隐窝面积(ARA750)均较术前不同程度升高,术后前房宽度(ACW)、巩膜突起750.μm处的虹膜厚度(IT750)均无明显变化,术后虹膜弯曲度(I-Curv)、虹膜横断面面积、虹膜突面积较术前降低.术前LT与术后ACD及术后TISA500均呈高度正相关.术前晶状体拱高(LV)与术后3个月ACD及术后3个月AOD500均呈正相关.综合文献证实,白内障超声乳化摘出术可解除瞳孔阻滞,减小虹膜压迫,使得前房加深和房角增宽.白内障超声乳化摘出联合人工晶状体植入术可用于青光眼的治疗,值得进一步推广.     

原发性闭角型青光眼合并白内障患者眼前节生物测量

目的采用眼前节光学相干断层扫描（SL-OCT）、超声生物显微镜（UBM）及传统的A型超声3种不同的检测方法观察原发性闭角型青光眼（PACG）合并白内障患者的眼前节解剖结构,评价3种检测方法的临床应用价值。方法研究设计为诊断试验。对PACG合并白内障的患者30例42眼行白内障超声乳化联合人工晶状体（IOL）植入术,于术前、术后1个月分别用SL-OCT、UBM及A型超声对眼前节进行测量,分析手术前后SL-OCT、UBM及A型超声测量的眼前节参数的变化,并比较3种不同的检查方法对眼前节测量参数间的差异,同时监测手术前后视力及眼压的情况。结果 SL-OCT、UBM、A型超声检测显示所有患者术后1个月中央前房深度（ACD）明显增加,与术前比较差异均有统计学意义（t=-15.695、t=-15.367、t=-6.981,P〈0.01）;术后1个月SL-OCT和UBM检测500μm房角开放距离（AOD500）、小梁虹膜夹角与术前比较差异均有统计学意义（P〈0.01）;术后1个月周边部、中周部、瞳孔缘区虹膜厚度（IT）与术前比较差异均无统计学意义（P〉0.05）。术前和术后1个月SL-OCT、UBM和A型超声3种检测方法测得的ACD差异均有统计学意义（F=21.060,P〈0.01;F=21.012,P〈0.01）,术前和术后1个月SL-OCT和UBM检测的AOD500、小梁虹膜夹角差异均有统计学意义（P〈0.01）,而IT差异无统计学意义（P〉0.05）。术前及术后3d、7d、1个月眼压逐渐下降,视力逐渐改善,差异均有统计学意义（F=35.792,P=0.000;F=124.891,P=0.000）。结论 SL-OCT、UBM和A型超声可以客观、准确地提供PACG合并白内障患者眼前节的解剖参数,为选择白内障超声乳化联合IOL植入术的手术时机提供参考依据。     

Imaging of iris lesions with high-speed optical coherence tomography.

BACKGROUND AND OBJECTIVES: To image and measure iris tumors with optical coherence tomography (OCT). PATIENTS AND METHODS: High-speed (2,000-4,000 axial-scan/sec and 4-16 frames/sec) 1.3-micron wavelength anterior segment OCT prototypes were used to image 6 eyes of 6 patients with a variety of iris lesions, including focal iris nevus, diffuse iris nevus, amelanotic iris nevus, iris melanocytosis, and iris melanoma. OCT images were compared with slit-lamp photography and ultrasound biomicroscopy. RESULTS: OCT at 1.3-micron wavelength could penetrate the full thickness of the iris lesions and allow three-dimensional measurement of lesion size. Internal reflectivity is correlated with pigmentation. OCT is a convenient non-contact method that provides imaging of the clinically important angle structures (scleral spur and angle recess). CONCLUSIONS: OCT is a new imaging modality that complements slit-lamp photography and ultrasound biomicroscopy for serial evaluation of iris     

Imaging of the anterior eye chamber with optical coherence tomography

BACKGROUND: Optical coherence tomography (OCT) represents a high-resolution diagnostic method which can be used to precisely image the anterior eye segment. Further developments in scanning technology and data evaluation allowed to visualize the entire anterior eye segment in one image, and the purpose of this study was to clinically evaluate this new system. PATIENTS AND METHODS: The studied OCT system was adapted to a slit-lamp and allowed us to image the anterior segment with an axial resolution of 10 microm at a scanning rate of 200 Hz with a depth of 7 mm and a maximal width of 15 mm. In selected cases the clinical value of anterior segment OCT was assessed. The reproducibility and level of agreement of anterior chamber depth measurements were assessed during the preoperative examination in 49 cataract surgery patients and compared to ultrasound (US) biometry (10 MHz). RESULTS: The studied anterior segment OCT allowed the cross-sectional imaging of the entire anterior eye segment. Changes of the anterior chamber before and after cataract surgery or surgical iridectomy were visualised. Furthermore, the findings of the anterior chamber after implantation of an iris-fixated intraocular lens (IOL) and an iris prosthetic system could be assessed. The reproducibility of the anterior chamber depth measurement was +/- 22 microm (OCT) and +/- 76 microm (US). The mean difference between optical and acoustic values was 1 microm (0.03 % p = 0.921) and the limits of agreement (95 % confidence interval) were 260 microm (8.58 %). CONCLUSIONS: The anterior segment OCT proved to be a helpful diagnostic method. The cross-sectional visualisation of the entire anterior chamber allowed us to assess important values for the implantation of iris-fixated IOL and other changes after surgical procedures. The resolution and reproducibility were higher than for conventional ultrasound biometry.     

前段光学相干断层成像测量翼状胬肉术后结膜植片厚度的临床研究

目的 应用前段光学相干断层扫描仪（Visante OCT）对翼状胬肉切除术后球结膜植片在不同时间内进行测量,对比观察球结膜植片厚度在翼状胬肉术后短期内的改变.方法 回顾性分析翼状胬肉切除联合球结膜移植术13例（13眼）,应用Visante OCT测量术后1周、1个月及3个月球结膜植片距离巩膜突1 mm、2 mm及3 mm的厚度;对照组对术眼相同位置的正常颞侧球结膜厚度进行测量.结果 术后1周,结膜植片的平均厚度最大为（456±169） μm,至术后1个月植片厚度逐渐减小至（303±64） μm,差异有统计学意义（t=3.055,P=0.002）;术后3个月植片厚度继续减小为（289±117） μm,但与术后1个月相比差异并无统计学意义（t=0.695,P=0.89）.设定位置相对应的颞侧球结膜厚度术后1周、1个月及3个月厚度别为（58±16） μm、（61±14） μm、（61±19） μm,差异无统计学意义;术后不同时间段内结膜植片厚度均明显大于正常结膜厚度.结论 通过Visante OCT的测量,翼状胬肉切除术后1周,结膜植片明显增厚;至术后3个月表现出厚度逐渐减小的趋势.Visante OCT可准确地对翼状胬肉术后结膜厚度做出较为准确的评估.     

Recent advances in ophthalmic anterior segment imaging: a new era for ophthalmic diagnosis?

Anterior segment imaging is a rapidly advancing field of ophthalmology. New imaging modalities, such as rotating Scheimpflug imaging (Pentacam-Scheimpflug) and anterior segment optical coherence tomography (Visante OCT and Slit-Lamp OCT), have recently become commercially available. These new modalities supplement the more established imaging devices of Orbscan scanning slit topography and ultrasound biomicroscopy (UBM). All devices promise quantitative information and qualitative imaging of the cornea and anterior chamber. They provide a quantitative angle estimation by calculating the angle between the iris surface and the posterior corneal surface. Direct angle visualisation is possible with the OCT devices and UBM; they provide images of the scleral spur, ciliary body, ciliary sulcus and even canal of Schlemm in some eyes. Pentacam-Scheimpflug can measure net corneal power, a feature particularly useful for cataract patients having undergone previous corneal surgery. Anterior segment OCT can measure corneal flap depth following LASIK and anterior chamber width prior to phakic intraocular lens implantation. The arrival of the new imaging devices may herald the dawn of a new era for ophthalmic diagnosis, particularly in view of the ease and non-contact nature of examination.     

Scleral expansion bands for presbyopia

OBJECTIVE: To evaluate the safety and effectiveness of surgery using scleral expansion bands. DESIGN: Prospective, noncomparative, small case series. PARTICIPANTS: Six subjects were enrolled. Four subjects received implants in one eye and two subjects received implants in both eyes. METHODS: Implantation of the scleral expansion bands (SEB) was performed using Schachar's standard technique. Subjects were observed at six postoperative examination intervals through 1 year. MAIN OUTCOME MEASURES: The key efficacy measures were distance-corrected near visual acuity (at 40 cm and 60 cm) and subjective amplitude of accommodation (push-up, push-down, and minus lens procedures). RESULTS: Distance visual acuity was similar before and after surgery. The near visual acuity and the subjective amplitude of accommodation were temporarily improved in three eyes. However, in the other five eyes, we did not note any improvement of accommodation or near vision after the scleral expansion surgery. CONCLUSIONS: In this study, the outcome of the SEB intervention was characterized by inconsistent and unpredictable results with a low level of patient satisfaction.     

无玻璃体眼经巩膜睫状沟后房型人工晶状体固定术

目的 探讨玻璃体切割术后无玻璃体眼经巩膜睫状沟后房型人工晶状体固定手术方法并评价其疗效。方法 对8例(8眼)玻璃体切割术后无玻璃体眼行经巩膜睫状沟后房型人工晶状体固定术(PC-IOL)。术后随访3～56个月。结果 术后裸眼视力均较术前提高，术后最佳矫正视力均达到或接近术前最佳矫正视力，其中≥0．5者1眼，≥1．O者3眼。术中低眼压2眼、眼球塌陷1眼，术后前房积血3眼，玻璃体积血3眼，人工晶状体脱位1眼，一过性高眼压3眼，黄斑囊样水肿3眼，视网膜脱离1眼。结论 经巩膜睫状沟PC-IOL固定术是无玻璃体并伴有眼前段结构紊乱眼恢复视力的补救手术。术中注意稳定眼压，可减少或避免术中、术后并发症。