飞秒LASIK术后早期前房参数的变化研究

目的：探讨飞秒LASIK术后早期前房参数的变化情况。

方法：收集2014-01/06在我院就诊符合常规手术适应证并接受飞秒LASIK手术的患者共90例90眼,其中男47例47眼,女43例43眼,年龄18～33(平均22.38±3.96)岁。根据屈光度分为三组：A组：轻度近视组,30例30眼,≤3D; B组：中度近视组,30例30眼,>3～6D; C组：高度近视组,30例30眼,>6D。分别于术前、术后1,3mo行Pentacam检查测量前房相关参数,包括前房深度(ACD)、前房容积(ACV)、前房角(ACA)变化值。

结果：所有手术顺利,无并发症。A,B,C组术前与术后1,3mo时ACD和ACV比较,差异均有统计学意义(P<0.05),而A组术后1,3mo时ACD和ACV值比较差异有统计学意义(P<0.05),B组和C组术后1,3mo时ACD和ACV值比较差异无统计学意义(P>0.05); 无论A组和B组还是C组,ACA值差异均无统计学意义(P>0.05)。屈光度与ACD,ACV,ACA变化值无明显相关性。

结论：飞秒LASIK术后早期引起前房参数变化,包括ACD变浅,ACV变小,但对周边前房角无明显影响,对屈光手术后行内眼手术患者有进一步指导作用。     

飞秒 LASlK 术后早期前房参数的变化研究

目的：探讨飞秒LASIK术后早期前房参数的变化情况。
　　方法：收集2014－01／06在我院就诊符合常规手术适应证并接受飞秒LASIK手术的患者共90例90眼,其中男47例47眼,女43例43眼,年龄18～33（平均22．38±3．96）岁。根据屈光度分为三组：A组：轻度近视组,30例30眼,≤3 D;B组：中度近视组,30例30眼,＞3～6 D;C组：高度近视组,30例30眼,＞6D。分别于术前、术后1,3mo 行Pentacam检查测量前房相关参数,包括前房深度（ ACD）、前房容积（ ACV）、前房角（ ACA）变化值。
　　结果：所有手术顺利,无并发症。 A,B,C组术前与术后1,3 mo时 ACD 和 ACV 比较,差异均有统计学意义（ P＜0．05）,而A组术后1,3 mo时ACD和ACV值比较差异有统计学意义（ P＜0．05）,B组和C组术后1,3 mo时ACD和ACV值比较差异无统计学意义（ P＞0．05）;无论A组和B组还是C组,ACA值差异均无统计学意义（P＞0．05）。屈光度与ACD,ACV,ACA变化值无明显相关性。
　　结论：飞秒LASIK术后早期引起前房参数变化,包括ACD变浅,ACV变小,但对周边前房角无明显影响,对屈光手术后行内眼手术患者有进一步指导作用。     

应用Pentacam评价激光周边虹膜切除术前后前房形态参数的改变

目的：通过比较Pentacam测量的可疑房角关闭患者行激光周边虹膜切除术前后各项参数,探讨评价前房形态改变的敏感参数。
　　方法：诊断为可疑房角关闭并接受激光周边虹膜切除术治疗的患者33例60眼。患者术前及术后1 d行Pentacam检查,观察前房各项参数在激光前后的变化,进行配对 t检验。
　　结果：与术前相比较,中央前房深度差异无统计学意义,周边前房深度明显加深,差异有统计学意义;前房容积明显增加,差异有统计学意义。前房夹角变宽,从治疗前的(22.26°±5.18°)增加为治疗后的(26.42°±5.20°),差异有统计学意义。
　　结论：激光周边虹膜切除术可以显著增加可疑房角关闭患眼的周边前房深度和前房容积,周边前房深度和前房容积可作为评价前房形态改变的敏感参数。     

Pentacam评估高度近视有晶状体眼人工晶状体植入术前后眼前节形态的改变

目的：通过眼前节全景分析仪( Pentacam)量化分析高度近视患者行ICL植入术手术前后眼前节形态的改变,评估手术的安全性、有效性。
　　方法：收集我院2011-09/2013-02高度近视眼行ICL植入手术的患者21例39眼,术后随访6~12mo。通过Pentacam分别测量术前;术后1wk;1,6mo的中央前房深度( ACD)、前房角度(ACA)、前房容积(ACV);记录术后1wk;1,6mo的ICL拱高(ICL-vault);记录术前裸眼视力(pre-UCVA)、最佳矫正视力( BCVA)、术后裸眼视力( post-UCVA)以及眼压值。使用SPSS18.0统计软件分析各项指标,术前、术后的资料均采用配对t检验进行统计学分析。
　　结果：术前;术后1wk;1,6mo 的ACD分别是3.27±0.22,3.02±0.33,2.98±0.31,2.98±0.32mm, ACA分别是(40.39±5.40)°,(26.70±4.47)°,(26.96±4.48)°,(26.95±4.45)°, ACV分别是207.74±25.43,122.87±17.58,128.05±17.84, 128.64±17.50mm 3。术后1wk;1,6mo的拱高分别是0.49±0.13,0.46±0.13,0.46±0.14mm。术前与术后3个不同时段的ACD,ACA,ACV的值相比,其均存在统计学差异( P<0.05);术后1 wk拱高与术后1,6 mo拱高相比,均存在统计学差异( P<0.05)。 BCVA手术前后比较,亦存在统计学差异( P<0.05)。 ICL与透明晶状体没有任何接触,没有引起房角关闭。术后随诊未发现白内障、青光眼、黄斑囊样水肿、视网膜脱离等术后并发症。
　　结论：通过眼前节全景分析仪( Pentacam)分析发现ICL术后前房变浅,房角变窄,前房容积变小,但人工晶状体与透明晶状体之间仍拥有安全的间隙,ICL植入术治疗高度近视眼安全、有效,但远期疗效有待进一步观察。     

Comparison of corneal measurements in keratoconic eyes using rotating Scheimpflug camera and scanning-slit topography

AIM: To compare the anterior segment measurements obtained by rotating Scheimpflug camera (Pentacam) and Scanning-slit topography (Orbscan IIz) in keratoconic eyes. METHODS: A total of 121 patients, 71 males (58.7%) and 50 females (41.3%) (214 eyes) with the diagnosis of keratoconus (KC) were enrolled in this study. Following diagnosis of KC by slit-lamp biomicroscopic examination, central corneal thickness (CCT), thinnest corneal thickness (TCT), anterior chamber depth (ACD), and pupil diameter (PD) were measured by a single examiner using successive instrumentation by Pentacam and Orbscan. RESULTS: There was no significant difference between the two instruments for the measurement of CCT and TCT. In contrast, scanning-slit topography measured ACD (3.46±0.40 mm vs. 3.38±0.33 mm, P=0.019) and PD (4.97±1.26 mm vs 4.08±1.19 mm, P<0.001) significantly larger than rotating Scheimpflug camera. The two devices made similar measurements for CCT (95% CI: -2.94 to 5.06, P=0.602). However, the mean difference for TCT was -6.28 (95% CI: -10.51 to -2.06, P=0.004) showing a thinner measurement by Orbscan than by Pentacam. In terms of the ACD, the mean difference was 0.08 mm (95% CI: 0.04 to 0.12, P<0.001) with Orbscan giving a slightly larger value than Pentacam. Similarly, Orbscan measurement for PD was longer than Pentacam (95% CI: 0.68 to 1.08, P<0.001). CONCLUSION: A good agreement was found between Pentacam and Orbscan concerning CCT measurement while comparing scanning-slit topography and rotating Scheimpflug camera there was an underestimation for TCT and overestimation for ACD and PD.     

Effects of primary selective laser trabeculoplasty on anterior segment parameters

AIM:To investigate the effects of selective laser trabeculoplasty (SLT) on the main numerical parameters of anterior segment with Pentacam rotating Scheimpflug camera in patients with ocular hypertension (OHT) and primary open angle glaucoma (POAG).METHODS: Pentacam measurements of 45 eyes of 25 (15 females and 10 males) patients (12 with OHT, 13 with POAG) before and after SLT were obtained. Measurements were taken before and 1 and 3mo after SLT. Pentacam parameters were compared between OHT and POAG patients, and age groups (60y and older, and younger than 60y).RESULTS: The mean age of the patients was 57.8±13.9 (range 20-77y). Twelve patients (48%) were younger than 60y, while 13 patients (52%) were 60y and older. Measurements of pre-SLT and post-SLT 1mo were significantly different for the parameters of central corneal thickness (CCT) and anterior chamber volume (ACV) (P<0.05). These parameters returned back to pre-SLT values at post-SLT 3mo. Decrease of ACV at post-SLT 1mo was significantly higher in younger than 60y group than 60y and older group. There was no statistically significant difference in Pentacam parameters between OHT and POAG patients at pre- and post-treatment measurements (P>0.05).CONCLUSION:SLT leads to significant increase in CCT and decrease in ACV at the 1^st month of the procedure. Effects of SLT on these anterior segment parameters, especially for CCT that interferes IOP measurement, should be considered to ensure accurate clinical interpretation.     

三种仪器测量白内障术前角膜生物学参数的比较

目的：比较Pentacam、IOL Master和iTrace三种仪器测量白内障患者术前角膜曲率和散光的测量值的差异。

方法：前瞻性临床研究。收集白内障患者68例82眼，术前均接受IOL Master、Pentacam及 iTrace检查，测量患眼平坦轴角膜曲率(K1)、陡峭轴角膜曲率(K2)、角膜散光及轴向，计算平均角膜曲率(Km)、散光矢量 J0和J45，分析三种仪器测量结果的差异性、相关性和一致性。

结果：三种仪器测量的K1、K2、Km值均无差异(P>0.05)； 三种仪器测量的K1、K2、Km值均呈高度相关(|r|>0.5，P<0.01)，IOL Master与Pentacam、IOL Master与iTrace测量的J0、J45值均呈中度相关(0.3<|r|<0.5，P<0.01)，Pentacam与iTrace测量的J0、J45值均呈低度相关(0.1<|r|<0.3，P<0.05)； Bland-Altman分析法显示三种仪器测得K1、K2、Km、J0、J45一致性差。

结论：Pentacam、IOL Master和iTrace测量角膜曲率及散光之间具有相关性，但一致性差，不可任意替代使用，需根据患者眼部具体情况谨慎选择。     

Corneal Manifestations of Systemic Sclerosis

Purpose: Corneal involvement in systemic sclerosis (SSc) is rare, but due to rich collagen composition cornea is especially vulnerable to connective tissue diseases. Therefore, our aim was to evaluate corneal parameters of SSc patients.

Methods: The study included 32 SSc patients and 39 control subjects with no ocular symptoms or ocular surface disorders. All study participants underwent Pentacam evaluation and objective signs of dry eye disease (DED), and clinical parameters were evaluated.

Results: All pachymetric values, most of the corneal front surface, corneal volume, as well as anterior chamber depth measurements were significantly lower in the SSc group than in the control group (p < 0.05). Significant negative correlation was found between corneal parameters and age on the one hand, and disease duration on the other.

Conclusions: Early recognition of corneal impairment, a possible extraintestinal manifestation of SSc, should be included in the check-up of the disease in order to reduce sight-threatening complications.     

iTrace与IOL Master 700和Pentacam HR测量白内障术前角膜散光的比较

目的：iTrace与IOL Master 700和Pentacam HR在白内障术前测量角膜散光的差异性及一致性。

方法：横断面研究。收集2020-05/2021-05来院就诊的白内障患者149例181眼。术前使用iTrace、IOL Master 700和Pentacam HR三种仪器测量陡峭轴角膜曲率(Ks)、平坦轴角膜曲率(Kf)、平均角膜曲率(Km)、角膜散光度数(Cyl)、陡峭轴轴位(Axis)。分析三种仪器测量指标的差异性及一致性。

结果：三组仪器间测量Ks、Kf、Km均有差异(F=4.912、3.514、4.873，均P<0.05)，Cyl与Axis均无差异(F=0.523、0.128，均P>0.05)。Bland-Altman分析提示iTrace与另两种仪器测量的Ks、Kf一致性较差，Cyl和Axis的一致性好，但Axis差值不在临床可接受范围。低度散光组(50眼)、中度散光组(34眼)和高度散光组(18眼)的iTrace与另两种仪器的测量值差值均无差异(P>0.05)。

结论：iTrace与IOL Master 700和Pentacam HR在白内障患者术前测量除散光度一致性好外，其余Ks、Kf均有差异性，Axis差值偏大，超过临床可接受范围，尤其是高度散光组。白内障术前角膜散光的测量应选择多种测量仪器，全方位规划手术方案。     

IOl-master700和Pentacam测量Kappa角一致性分析

目的探讨Pentacam眼前节分析系统与IOL-master 700测量Kappa角的差异性和一致性。方法横断面研究。选取2019年03月01-04月01在乐山市眼科中心性白内障术前检查患者71例(121只眼)。其中男性40例,女性31例;年龄(62±17岁)。分别用Pentacam、IOLMaster 700进行X值及Y值测量,采用方差分析及LSD-t比较组间差异性,组内相关系数(ICC)及Bland-Altman法评价仪器的一致性。结果方差分析显示,两种仪器测量X值无统计学意义(F=0.496,P>0.05),Y值无统计学意义(F=0.030,P>0.05),两种仪器各测量值间ICC为0.667、0.689,Cronbach’s Alpha为0.79、0.816,显示两种仪器测量结果可信度好。Bland-Altman分析显示Pentacam与IOLMaster 700测量X值比较,有7/121(5.8%)个点位于95%LoA外,一致性好,差值范围为(-0.19~0.22);Y值测量,有8/121(6.7%)个点位于95%LoA外,一致性好,差值范围为(-0.14~0.15),一致性好。结论两种仪器测量KAPPA角的差异性小,一致性均较好。