角膜屈光手术是目前屈光手术的主流术式，随着全飞秒、全激光手术方式的发展，手术变得更加安全精准，不仅角膜创伤小，术后恢复时间也进一步缩短。角膜具有屈光特性和典型的生物软组织力学特性，角膜力学特性不仅参与维持角膜形态，影响角膜手术尤其屈光手术的效果及预后，而且还与部分角膜疾病的发生和发展密切相关。近年来生物力学研究发展迅速，其在眼部疾病的诊疗中发挥着越来越重要的作用。角膜生物力学的变化与术前角膜的形态、不同手术方式的选择、术后角膜厚度的改变等多种因素相关，但手术导致的角膜自身形态改变是不可逆的，若术后角膜生物力学的变化较大，可能会引起医源性角膜扩张、继发性圆锥角膜等并发症的发生。为了规避术后角膜扩张风险和指导个性化的术式选择，了解角膜生物力学特性的影响至关重要。文章对角膜的基础结构、角膜生物力学特性、生物力学测量方法和不同术式及不同角膜瓣厚度术后生物力学变化的研究进展进行综述，为近视患者的个性化精准治疗提供理论指导。
Corneal refractive surgery is currently main stream of refractive surgery. With the development of femtosecond and laser surgery, the surgery has become safer and more accurate, resulting in less corneal trauma and a shorter postoperative recovery time. In recent years, biomechanics research has rapidly progressed, and its clinical application has gradually increased. The cornea not only possesses refractive properties but also exhibits typical biological soft tissue mechanical properties. Corneal mechanical properties not only play a role in maintaining corneal morphology but also influence the outcome and prognosis of corneal surgery, especially refractive surgery, and are closely related to the occurrence and development of some corneal diseases. Corneal refractive surgery involves cutting the cornea according to the patient's diopter, which disrupts the integrity of the cornea and inevitably affects its biomechanical stability. Changes in corneal biomechanics are associated with various factors, such as preoperative corneal morphology, the selection of different surgical methods, and postoperative changes in corneal thickness. However, the self-morphology changes caused by surgery are irreversible. If the postoperative changes in corneal biomechanics are significant, it may lead to complications such as postoperative corneal dilation and secondary keratoconus. To avoid postoperative iatrogenic corneal dilation and guide personalized surgical choice, it is crucial to understand the limits of influence of corneal biomechanical properties. This article reviews the research progress regarding corneal biomechanical properties and changes associated with corneal refractive surgery.
目的：旨在研究按移植指征分类以及移植前角膜血管形成对手术后5年内排斥反应和移植物失败率的相对风险。方法：分析1999—2017年间，英国移植登记处记录的所有因圆锥角膜(keratoconus,KC)、人工晶状体大泡性角膜病(pseudophakic bullous keratopathy,PBK)或既往感染(病毒/细菌/真菌/原生动物)而首次进行角膜移植的成年人。统计移植前受体角膜血管化象限的数量、血管化类型、移植后排斥反应的间隔时间(如果有的话)以及移植后5年的结果。通过多变量风险调整Cox回归法进行排斥反应和移植失败的危险因素建模。结果：KC、PBK和感染患者的角膜血管形成率分别为10%、25%和67%。只有当存在浅表和(或)深部血管形成时(HR分别为1.3和1.4，P=0.004)，存在两个以上象限的血管形成时，PBK患者移植排斥反应的风险才会增加(HR=1.5，P=0.0004)。因既往感染而接受移植的个体在四个象限的血管形成中发生排斥反应的风险增加(HR=1.6，P=0.003)。在任何一组中，经过风险调整后，与血管形成有关的移植失败率并未上升。对于含有血管的受体角膜，相对于穿透性KC和PBK移植，没有充分的证据显示板层移植在降低排斥反应或失败风险方面存在优势。结论：血管化是5年内角膜移植排斥反应的危险因素。移植的适应证对这种风险的具有临床意义。
Objective: To investigate the relative risk of pretransplant corneal vascularisation on rate of rejection and graft failure within 5 years of surgery when categorised by indication for transplantation. Methods: We analysed all adults recorded in the UK transplant registry who had a first cornea transplant for keratoconus (KC), pseudophakic bullous keratopathy (PBK) or previous infection (viral/bacterial/fungal/protozoan) between 1999 and 2017. We analysed the number of quadrants of the recipient cornea vascularised before transplant and type of vascularisation, the interval posttransplant to rejection, if any, and the outcome at 5 years post-transplant. Risk factors for rejection and transplant failure were modelled by multivariable risk-adjusted Cox regression. Results: Corneal vascularisation was recorded in 10%, 25% and 67% of patients with KC, PBK and infection, respectively. Individuals with PBK had an increased hazard of transplant rejection only when there were more than two quadrants of vascularisation (HR 1.5, p=0.004) when either superficial and/or deep vascularisation was present (HR 1.3 and 1.4, respectively, p=0.004). Individuals who had a transplant for previous infection had an increased hazard of rejection with four quadrants of vascularisation (HR 1.6, p=0.003). There was no risk-adjusted increase in transplant failure associated with vascularisation in any group. There was weak evidence of reduction in risk of rejection and/or failure associated with lamellar compared with penetrating transplantation in KC and PBK in vascularised recipient corneas. Conclusion: Vascularisation is a risk factor for corneal allograft rejection within 5 years. The indication for transplantation has a clinically significant effect on the magnitude of this risk.
目的：采用角膜激光共焦显微镜观察研究颗粒状角膜营养不良家系患者的角膜状况。方法：采用角膜激光共焦显微镜对4例(6只眼)颗粒状角膜营养不良患者的角膜进行扫描检测，对比裂隙灯及普通显微镜观察分析检查情况。结果：颗粒状角膜营养不良患者的病变角膜裂隙灯下呈现面包屑样的灰白色混浊，在苏木精-伊红(hematoxylin-eosin，HE)染色中呈现出伊红染的颗粒，沉积于基质板层之间，在共焦显微镜下则为中高反光的团块，相互融合，并取代了基质细胞。结论：颗粒状角膜营养不良患者角膜病变从裂隙灯到普通HE染色下的显微镜，乃至高倍的共焦显微镜观察到的沉积物，分布情况相吻合，印证角膜病变发展的状况，有利于了解该病变的发展情况。
Objective: To observe and study the corneal in patients of family with granular corneal dystrophy by confocal laser scanning microscopy. Methods: The corneas of 4 patients (6 eyes) with granular corneal dystrophy were scanned by laser confocal microscopy, and the results were compared with those observed by slit lamp and ordinary microscope. Results: The image were gray and white bread-crumb-like opacity under the slit-lamp of cornea in patients of family with granular corneal dystrophy, were eosin-stained granules deposited between stroma layers in hematoxylin-eosin (HE) stain under the microscopy, were high reflective masses under the confocal laser scanning microscopy, which fused with each other. Conclusion: The image of the corneal in patients of family with granular corneal dystrophy were clearer and clearer by from Slit Lamp and microscopy to the confocal laser scanning microscopy. The distribution of sediments was consistent with each other. It can be a good understanding of the development of the disease.
目的：评估硅油填充术后眼压对角膜内皮细胞的影响及变化特点。方法：选取2019年1月1日至9月30日在佛山市第二人民医院眼科中心行玻璃体切除联合硅油注射的患者共131名，分为高眼压组(n=80)和正常眼压组(n=51)。高眼压组术后任意一次测眼压>21 mmHg，正常眼压组术后眼压均≤21 mmHg。比较填充硅油前与取硅油时的角膜内皮细胞参数测量值。结果：高眼压组的平均眼压为20.79 mmHg，正常眼压组的平均眼压为14.70 mmHg(P<0.001)。取硅油时，两组角膜内皮细胞密度(corneal endothelial cell density，ECD)均明显减少，平均内皮细胞面积均明显增大(P<0.05)，高眼压组内皮细胞大小变异系数(coefficient of variation of endothelial cell size，CV)明显变大(P<0.05)。高眼压组ECD丢失率(6.3%)高于正常眼压组(3.5%)；其中，高眼压组中术后1~6周内的眼压升高(7.1%)、眼压≥40 mmHg(7.3%)对角膜内皮细胞影响最大。ECD丢失与眼压变化有显著相关性(r=0.176，P=0.044)。结论：硅油填充后高眼压是角膜内皮细胞丢失的重要危险因素。
Objective: To evaluate the effect of intraocular pressure (IOP) on corneal endothelial cells after silicone oil tamponade. Methods: Patients (n=131) received vitrectomy with silicone oil injection in Ophthalmology Center in Second People’s Hospital of Foshan City from January 1st to September 30th 2019 were divided into the high IOP group (n=80) and normal IOP group (n=51). IOP was >21 mmHg at any time in the high IOP group and was ≤21mmHg in the normal IOP group after surgery. The values of corneal endothelial cells before filling with silicone oil and before removing silicone oil were compared.Results: The average IOP was 20.79 mmHg in the high IOP group, and 14.70 mmHg in the normal IOP group (P<0.001). The number of endothelial cells (ECD) was reduced, but the average endothelial cell area was increased (P<0.05) in both groups. The coefficient of variation of endothelial cell size in high IOP group was increased (P<0.05). ECD loss rate was 6.3% in the high IOP group and 3.5% in normal IOP group. Increased IOP within 1–6 weeks after surgery (7.1%) and IOP ≥40 mmHg (7.3%) had the greatest impact on ECD. ECD loss was correlated with IOP (r=0.176, P=0.044). Conclusion: High intraocular pressure after silicone oil filling is an important risk factor for the loss of corneal endothelial cells.Keywords intraocular pressure; corneal endothelium; silicone oil; vitrect
角膜病是眼科常见疾病，治疗主要以病因治疗为主。角膜疾病治疗不及时会发展为角膜云翳、角膜斑翳、角膜白斑甚至丧失视力。本例患者主要是一例因外伤形成角膜白斑致使视力低下，于三峡大学附属仁和医院行自体穿透性角膜移植(autologous penetrating keratoplasty，APK)的特殊病例。
Keratoconus is a common disease in ophthalmology and treatment is mainly based on etiology. Untreated corneal diseases can develop into corneal clouding, corneal macula, corneal leukoplakia or even loss of vision. This is a special case of a patient who underwent autologous penetrating keratoplasty (APK) in our hospital for low vision due to traumatic formation of corneal leukoplakia.
角膜神经性疼痛(neuropathic corneal pain，NCP)的患者具有眼部及躯体症状，但临床体征不典型，治疗效果不理想。随着干眼诊治的规范化程度不断提升，NCP的患者日益增多。NCP与全身慢性疼痛综合征相互交织。角膜共聚焦显微镜及活体印迹细胞检测可以发现特征性神经形态及相关蛋白改变。NCP的治疗应基于个体化、多学科联合的原则。本文综述近年来，NCP的病因学、病理生理学、综合治疗等取得新的进展以指导临床及转化医学研究。
Patients with neuropathic corneal pain (NCP) have local and physical symptoms, but the clinical signs are atypical,and the treatment is not effect. With the improvement of standardization of diagnosis and treatment of dry eye, the number of patients with NCP has been increasing. The NCP is intertwined with systemic chronic pain syndrome.Corneal confocal microscope and in vivo blot cytology can find the signs of morphology and associated proteins variation. The treatments of NCP should be based on the principle of individualized, multidisciplinary treatment (MDT). This article reviews recent advances in the etiology, pathogenesis, and comprehensive treatment of NCP to guide clinical translational medicine research.
报告1例因电路短路产生电弧光烧伤患者双眼角膜的病例。专科检查:双眼角膜缘颞侧球结膜缺血区小于1/3，角膜上皮呈白色混浊，上皮部分脱落。入院给予清除角膜表面白色坏死组织、抗炎、扩瞳对症治疗，2周后角膜恢复透明，随访3个月患者晶状体及眼底未见明显异常；探讨电弧光在眼球不同部位的致病机制。
A case of corneal burn caused by arc light due to electrical short is reported. Specialist examination: ischemic areas of the temporal limbus bulbar conjunctiva in both eyes were less than 1/3, the corneal epithelium was white and cloudy, and the epithelium was partially peeled. The corneas became transparent after 2 weeks’ treatment of removing the white necrotic tissue, anti-inflammatory and dilating pupil. During the follow-up within 3 months, the patient’s lens and fundus showed no obvious abnormalities. The injury mechanism of arc light caused by electrical short to the eyeball is discussed.
随着白内障手术由复明性向屈光性转变，对角膜的散光矫正显得越来越重要。而角膜散光不仅仅应该关注角膜前表面的散光数据，更应该考虑角膜后表面的散光，否则对散光人工晶状体植入矫正角膜散光可能出现不同程度的术后屈光误差。角膜后表面散光均值约为0.37 D，且多数情况下会产生逆规散光的效果，因此在进行散光型人工晶状体计算时应考虑到这一特点，进一步防止术后欠矫或过矫的发生。
With the cataract surgery evolving from visual restoration surgery to refractive surgery, surgical correction of corneal astigmatism becomes more and more important. For Toric intraocular lens implantation, the surgeon should not only pay attention to the values in surface of anterior corneal astigmatism but also that in posterior corneal astigmatism. Otherwise,unwanted postoperative refractive errors may occur. The mean value of posterior corneal astigmatism was around 0.37 D.In most cases, the posterior corneal astigmatism produces against-the-rule effect. Therefore, the above-mentioned feature of posterior corneal astigmatism should be noticed to prevent the under-correction or over-correction effect of toric lens.
目的：针对活体共聚焦显微镜(in vivo confocal microscopy，IVCM)和传统光学相干层析技术(optical coherence tomography，OCT)在人眼角膜成像各自存在成像视野小或无法细胞成像的限制，开发具有高分辨率的非接触全视场光学相干层析系统(full-field optical coherence tomography，FFOCT)，实现活体人眼角膜细胞结构FFOCT成像。方法：FFOCT系统采用高数值孔径干燥显微物镜及高速面阵相机，使用双相位调制图像处理方法，实现系统高速高分辨率非接触成像。利用系统对健康人眼进行角膜各深度层的活体FFOCT成像验证其可行性。结果：本研究团队研发了FFOCT的新型活体人眼角膜高分辨率成像系统，实现理论平面成像分辨率1.7 μm，成像视野1.26 mm×1.26 mm，成像速率达275帧/s。利用该系统对正常活体人眼角膜成像实验，在非接触情况下获取了角膜各主要结构层的高分辨率结构影像。结论：FFOCT高分辨率活体人眼角膜成像系统兼具了传统OCT的非接触、大成像视野及IVCM的细胞级别平面分辨率的优势，将为角膜疾病的研究及临床诊疗提供全新的成像分析技术。
Objective: Due to the limitations of small imaging field of view of in vivo confocal microscopy (IVCM) or the incapability of cellular imaging of traditional optical coherence tomography (OCT) in human corneal imaging, this study was designed to develop a novel high-resolution in vivo human corneal imaging system based on full-field OCT (FFOCT). Methods: The FFOCT system utilized a high numerical aperture air immersion microscope objective and a high-speed area array CMOS camera with two-phase modulation image processing algorithm to achieve high-speed high-resolution non-contact imaging of human cornea. To verify its feasibility, in vivo cornea imaging at different depth was performed on a healthy human subject. Results: The FFOCT system achieved a theoretical lateral imaging resolution of 1.7 μm, an imaging field of view of 1.26 mm×1.26 mm, and an imaging rate of 275 Hz/s. High-resolution FFOCT images of the main structural layers of cornea were achieved by imaging a healthy human cornea in vivo with this system in a non-contact way. Conclusion: The FFOCT human corneal imaging system combines the advantages of the non-contractness and the large imaging field of view of traditional OCT with the cellular lateral resolution of IVCM, potentially providing a new imaging system for the research and clinical diagnosis and treatment of corneal diseases.
角膜异物是眼科急诊中常见病之一，不及时处置或处置不当会导致角膜不同程度的损伤，严重者可引起角膜感染、角膜穿孔等并发症，严重损害视功能。因此安全、高效地剔除角膜异物至关重要。本文从角膜异物的特点、伤后首诊时间、角膜合并感染以及角膜异物的剔除方法等方面对角膜异物剔除术预后的影响进行回顾总结，旨在为医护人员行角膜异物剔除时提供有用参考。
Corneal foreign body is one of common diseases in ophthalmic emergency. Improper handling can cause different degree of corneal injuries, even corneal infection, perforation and endophthalmitis. Therefore, it is essential to eliminate corneal foreign bodies safely and effectively. This article mainly summarizes the influence of the characteristics of the corneal foreign bodies, the first diagnosis time after injury, corneal co-infection and the methods of weeding out the corneal foreign bodies upon the clinical prognosis of corneal foreign body removal, aiming to provide useful reference for medical practitioners in removing corneal foreign bodies.
