Comparison of Intraocular Pressures at Different Points in Human's Cornea before and after Laser in situ Keratomileusis with Tono-Pen Tonometer

In order to explore the difference of intraocular pressure（IOP） at different points of cornea before and after laser in situ keratomileusis（LASIK）,IOP was measured by Tono-Pen Tonometer at central cornea,pericentral cornea and limbus respectively and analyzed statistically.After LASIK,IOP was dropped significantly at central cornea and pericentral cornea（P〈0.05）,while no statistically significant change occurred at limbus（P〉0.05）.There was no statistically significant difference in IOP at different points before LASIK（F=0.110,P=0.896）,but statistically significant difference was found after LASIK（F=7.375,P=0.001）.It was suggested that reliable IOP after LASIK could be obtained from the limbus by Tono-Pen tonometer.

Agreement of intraocular pressure measurement with Corvis ST,non-contact tonometer,and Goldmann applanation tonometer in children with ocular hypertension and related factors

AIM:To access the agreement of intraocular pressure(IOP)values obtained from biomechanically corrected tonometer[Corvis ST(CST)],non-contact tonometer(NCT),and Goldmann applanation tonometer(GAT)in children with NCT measured-IOP(NCT-IOP)values of 22 mm Hg or more,and related factors.METHODS:A total of 51 eyes with NCT-IOP≥22 mm Hg in children aged 7 to 14y were examined and IOP was measured by CST,NCT,and GAT.Based on GAT measured IOP(GAT-IOP),ocular hypertension(OHT)group(≥22 mm Hg,24 eyes)and the non-OHT group(<22 mm Hg,27 eyes)were defined.We compared the agreement of the three measurements,i.e.,CST measured IOP(CST-IOP),GAT-IOP,and NCT-IOP,and further analyzed the correlation between the differences in tonometry readings,central corneal thickness(CCT),axial length(AL),optic disc rim volume,and age.RESULTS:Compared with the OHT group,thicker CCT,larger rim volume,and higher differences between NCTIOP and GAT-IOP,were found in the non-OHT group.The differences between CST-IOP and GAT-IOP were lower than the differences between NCT-IOP and GAT-IOP in both groups.The mean differences in CST-IOP and GAT-IOP were 1.26 mm Hg(95%limit of agreement ranged from 0.1 to 2.41 mm Hg,OHT group)and 1.20 mm Hg(95%limit of agreement ranged from-0.5 to 3.00 mm Hg,non-OHT group),and the mean differences in NCT and GAT were 3.90 mm Hg(95%limit of agreement ranged from-0.19 to 9.70 mm Hg,OHT group)and 6.00 mm Hg(95%limit of agreement ranged from 1.50 to 10.50 mm Hg,non-OHT group).The differences between CST-IOP and GAT-IOP were not related to CCT,age,and AL in both groups;while the differences between NCT-IOP and GAT-IOP were related to CCT in the OHT group(r=0.93,P<0.001)and to CCT and AL in the non-OHT group(r=0.66,P<0.001,r=-0.81,P<0.001).CONCLUSION:The accuracy of NCT in the diagnosis of pediatric OHT is low.The agreement of CST-IOP and GATIOP was significantly higher in children with and without OHT than in those with NCT-IOP and GAT-IOP.Therefore,CST can be used as a good alternative for IOP measurement in children.The impacts of CCT and AL on NCT measurement need to be fully considered when managing childhood IOP.

Comparison of intraocular pressure measurements with different contact tonometers in young healthy persons

AIM：To analyze the correlation of Goldmann applanation tonometer（GAT）,I-Care tonometer and Tono-Pen tonometer results in young healthy persons,and to investigate the influence of central corneal thickness（CCT）on intraocular pressure（IOP）measurements recorded with these tonometers.·M ETHODS：We conducted a pilot clinical study in 78eyes of 78 subjects aged 22-28 years old（44 women and34 men;mean age 23.8±1.19y）.IOP was measured using GAT,I-Care and Tono-Pen tonometers,followed by measurements of CCT.Statistical analysis was performed using SPSS 20.0.·RESULTS：The mean IOPs and standard deviation（±SD）for GAT,I-Care and Tono-Pen were 15.62±2.281 mm Hg,16.29±2.726 mm Hg and 16.32±2.393 mm Hg,respectively.The mean CCT was 555.15±29.648μm.Clear positive correlations between GAT and I-Care,GAT and TonoPen,and I-Care and Tono-Pen tonometers were found（=0.867,〈0.001;=0.861,〈0.001;=0.915,〈0.001,respectively）.In comparison between devices,BlandAltman analysis showed a significant mean difference（MD）in the measurements by GAT and I-Care of-0.679 mm Hg and by GAT and Tono-Pen of-0.705 mm Hg（〈0.001）,but there was no significant difference between I-Care and Tono-Pe（〉0.05）.Both non-gold standard tonometers were affected by CCT;that is,both I-Care and Tono-Pen tonometer values were significantly higher with higher CCT means（〉555μm;MD=-1.282,〈0.001;MD=-0.949,〈0.001,respectively）compared with GAT.·CONCLUSION：Both I-Care and Tono-Pen tonometers overestimated IOP compared with the GAT values.Either the I-Care or Tono-Pen tonometer could be used instead of GAT because there was no significant difference between their results.Higher CCT values（〉555μm）were associated with overestimated IOP values.

Intraocular pressure measurement over soft contact lens by rebound tonometer: a comparative study

AIM: To evaluate the intraocular pressure(IOP)measurements by Icare rebound tonometer over a contact lens in comparison with Goldmann applanation tonometry(GAT). METHODS: Fifty patients using contact lens were included in this study. One of the eyes of the patients was selected randomly and their IOP were measured by rebound tonometer with and without contact lens(RTCL,RT respectively) and by GAT, as well as their central corneal thickness(CCT) by optical pachymeter. The results of both methods were compared by correlation analysis, general linear method repeated measure and Bland-Altman analysis.RESULTS: Mean IOP values measured by RTCL, RT and GAT were 15.68 ±3.7, 14.50 ±3.4 and 14.16 ±2.8(P 【0.001), respectively. Mean IOP by RTCL was significantly higher than the measurements implemented by RT and GAT(P 【0.001), while there was no difference between the measurements by GAT and RT(P =0.629). There was a good level of positive correlation between GAT and RTCL as well as RT(r =0.786 P 【0.001, r =0.833 P 【0.001, respectively). We have observed that CCT increase did not show any correlation with the differences of the measurements between RTCL and RT(P =0.329), RTCL and GAT(P =0.07) as well as RT and GAT(P =0.189) in linear regression model.CONCLUSION: The average of the measurements over contact lens by rebound tonometer was found to be higher than what was measured by GAT. Although this difference is statistically significant, it may be clinically negligible in the normal population.

Dynamic Contour Tonometry,Tono-Pen XL^(■),and Goldmann Applanation Tonometry in Comparison to Intracameral Intraocular Pressure(IOP)Measurements in Patients with Corneal Pathologies

Purpose: The accuracy of Goldmann applanation tonometry (GAT) has been shown to depend on several biomechanical properties of the cornea. Newer tonometry devices (e.g., the Dynamic Contour Tonometer PASCAL? [DCT] and the Tono-Pen? XL [TP]) have been designed to accurately measure intraocular pressure (IOP) independent of corneal thickness (CCT) and pathology. This study investigates the influence of corneal pathologies on the accuracy of these IOP measuring devices, and compares this accuracy to that of direct intracameral IOP measurement. Methods: 8 eyes of 8 patients suffering from corneal pathologies scheduled for penetrating keratoplasty, and 10 eyes of 10 patients scheduled for cataract surgery (control group) were examined. Before surgery, the anterior chamber was cannulated at the temporal corneal limbus. In a closed system, the intraocular pressure (IOP) was directly set to 10, 20, and 30 mmHg with a manometric water column. Intraocular pressure measurements taken by GAT, DCT, and TP were compared to intracameral measurements obtained by a precision reference pressure sensor. Results: Control group: All three methods showed good agreement with the intracameral readings (mean deviation of all three devices, -0.9 mmHg). Group with corneal pathologies: The TP yielded the most exact IOP values in the group with corneal pathologies when taking all diagnoses into account. The mean deviations from the intracameral IOP measurements were -0.9 mmHg ± 3.2 mmHg (mean ± SD) for TP, -2.9 mmHg ± 3.3 mmHg for GAT, and -5.0 mmHg ± 7.9 mmHg for DCT. For bullous keratopathy, the most exact IOP readings were obtained by the TP (mean deviation -0.2 mmHg ± 3.5 mmHg). The TP and GAT devices underestimated IOP in the patients with Fuchs’ endothelial dystrophy;all 3 devices underestimated adjusted IOP after keratoplasty. DCT showed the greatest deviations from adjusted IOP in the case of non-herpetic scars. In the control group, none of the devices showed a statistically relevant dependency on CCT. Nevertheless, in the group with corneal pathologies, only TP showed no dependency on CCT. Conclusion: Our results suggest that the Tono-Pen XL? is the most accurate measurement device to determine IOP in patients with corneal pathologies, especially in patients suffering from corneal edema (bullous keratopathy). GAT yielded surprisingly exact IOP values in patients suffering from irregular corneal surface. DCT showed a high degree of deviation from the adjusted IOP, and should not be used to determine IOP in corneas with the disorders listed here.

Tono-Pen眼压计测量人角膜不同部位眼压的比较

目的:用Tono-Pen眼压计测量人眼角膜中央、旁中央、角巩缘部位眼压值,比较不同部位值的差异及相关性。方法:正常角膜用Tono-Pen眼压计依次测量角膜中心、旁中心、角膜缘眼压值,方差分析不同部位眼压的差异,分析结果的相关性。结果:Tono-Pen眼压计检测得出的眼压平均值角膜中央为16.28±2.73mmHg,旁中央为16.33±2.69mmHg,角巩缘为16.58±2.58mmHg.角膜中心与旁中心的相关系数r=0.966,P=0.000,角膜中心与角膜缘的相关系数为r=0.897,P=0.000,角膜旁中心与角膜缘的相关系数为r=0.910,P=0.000。不同部位眼压值差异没有显著性(F=0.093,P=0.913>0.05)。结论:不同部位眼压值密切相关,差异没有统计学意义。Tono-Pen眼压计测量不同部位眼压均可取得较为一致的结果。

Tono-Pen眼压计对兔眼不同部位眼压测量值的相关性研究

目的研究兔眼球不同部位测量眼压(intraocular pressure,IOP)值的相关性规律。方法采用Tono-Pen眼压计全身麻醉下测量40只新西兰白兔角膜中央、旁中央区、角膜缘及巩膜部位IOP值,同时采用Schiotz眼压计测量角膜中央IOP值。采用SPSS软件分析不同部位IOP测量值间的相关性。结果兔角膜中央区、旁中央区、角膜缘及角膜缘后4mm巩膜部位IOP值分别为(19.44±2.33)mmHg(1kPa=7.5mmHg)、(19.44±1.95)mmHg、(21.66±4.26)mmHg和(21.83±4.84)mmHg,Schiotz眼压计测量角膜中央IOP值(19.27±3.14)mmHg。角膜旁中央区与角膜中央区IOP值有相关性,检验有统计学意义(R=0.615,P=0.007<0.01),而角膜缘、角膜缘后4mm巩膜与角膜中央区IOP值相关系数及P值分别为0.537/0.021、0.215/0.391。结论采用Tono-Pen眼压计测量兔眼角膜旁中央区或角膜缘眼压可以反映眼压实际值。

Tono-pen眼压计的可重复性和准确性研究

目的通过比较反复测量所得的眼压值,了解Tono-pen眼压计测量眼压的可重复性和准确性。方法选取眼科门诊就诊的84例患者和健康体检者2名共150眼纳入研究。由2名检查者先后用Tono-pen眼压计和Goldmann眼压计进行3次连续测量。按照Goldmann眼压计测量值从低到高将研究对象分为A、B、C3组：A组（低眼压组）IOP〈11mmHg（1kPa=7.5mmHg）,B组（正常眼压组）IOP为11~21mmHg,C组（高眼压组）IOP〉21mmHg。分组分析Tono-pen眼压计组内（检查者甲3次测量值之间）可重复性和组间（2名检查者之间）可重复性。以Goldmann眼压计为标准评价Tono-pen眼压计的准确性。结果组内可重复性：Tono-pen眼压计反复测量差值平均值A组（1.533±1.008）mmHg,B组（1.673±1.123）mmHg,C组（3.474±2.695）mmHg。组间可重复性：以2名检查者的测量平均值进行比较。Tono-pen眼压计组间相差范围：A组0.25~1.77mmHg,B组0.40~0.73mmHg,C组0.07~0.83mmHg。与Gold-mann眼压计测量值比较,A组Tono-pen眼压计平均偏低估计眼压0.87mmHg（0.02~1.71mmHg,P=0.045）,B组2种测量手段所得结果无差异（P=0.845）,C组Tono-pen眼压计平均偏低估计眼压5.76mmHg（2.30~9.21mmHg,P=0.003）。结论对于正常眼压范围的个体,Tono-pen眼压计测量值与Goldmann眼压计测量值相当,但对于低眼压或高眼压眼,Tono-pen眼压计测量值均比Goldmann眼压计测量值偏低。

Tono-Pen眼压计与Goldmann眼压计的临床比较

目的:了解Tono-Pen眼压计的临床实用性。方法:62例(111只眼)随机先后用Tono-Pen眼压计与Goldmann眼压计进行眼压测量,比较两种眼压计测量值的差异。结果:111只眼中,用Goldmann眼压计测量的眼压平均值为(15.82±4.88)mmHg,用Tono-Pen眼压计测量的眼压平均值为(16.34±4.33)mmHg,两者有显著性差异。眼压在9～30mmHg范围时,两种眼压计的测量值之差为(-0.51±2.24)mmHg,差异无显著性。在眼压低于9mmHg时,有过高估计眼压的趋向;在眼压高于30mmHg时,有过低估计眼压的趋向。Tono-Pen眼压计与Goldmann眼压计的相关系数为0.865,呈密切相关。结论:Tono-Pen眼压计与Goldmann眼压计有很好的相关性,尤其是在眼压为9～30mmHg范围。眼科学报 2002;18:226-229.

治疗性角膜接触镜对Tono-pen眼压计测量角膜病变患者眼压的影响

[目的]比较配戴治疗性角膜接触镜（TCL）前后Tono-pen眼压计测量角膜病变患者眼压测量的差异,分析治疗性角膜接触对Tono-pen眼压计测量值的影响.[方法]连续纳入2012年4月至2012年10月我院就诊的33例（33眼）角膜病变患者,包括大泡性角膜病变11眼、眼化学伤8眼、单疱病毒性角膜炎5眼、继发性青光眼4眼、前部角膜营养不良2眼、穿透性角膜移植术后2眼、复发性胬肉l眼.应用Tono-pen眼压计测量患者未配戴TCL和配戴TCL两种状态下的眼压,每种测量方式各重复测2次.用组内相关系数ICC计算每一种测量方法的重复性,计算重复测量间差异的95％可信限;配对t检验比较两种眼压测量方法的差异,计算差异的可信限95％LoA,并绘制Bland-Altman散点图.[结果]Tono-pen眼压计直接重复测量的ICC为0.986,两次测量的平均差值为（0.42± 1.98） mmHg,95％可信限为-4.30 ～ 3.46 mmHg,其中90.9％的测量差值≤3 mmHg;配戴治疗性角膜接触镜后重复测量的ICC为0.983,两次测量的平均差值为（0.12±2.19）mmHg,95％可信限为-4.46 ～ 4.22 mmHg,90.9％的测量差值≤3 mmHg.配戴治疗性角膜接触镜后Tono-pen眼压测量值平均减小（0.68±3.39）mmHg,差异无统计学意义（P=0.257）,两种测量结果的一致性系数ICC为0.959,差值的95％可信限为-7.32～5.96 mmHg,其中70％测量的差值≤3 mmHg;在平均眼压＜21 mmHg的患者中,82.4％的测量差值≤3 mmHg,在平均眼压≥21 mmHg的患者中,56.3％的测量差值≤3 mmHg.[结论]Tono-pen眼压计测量角膜病变患者的眼压有较好的重复性,配戴治疗性角膜接触镜对测量的重复性和总体的测量均值无影响.但配戴角膜接触镜前后眼压测量值存在一定程度的差异,高眼压者比正常眼压者的差异大,临床应用时应对测量结果进行客观的评价.

眼球不同部位Tono-Pen眼压计测量结果比较

目的:用Tono-Pen眼压计测量眼球各部位眼压值。方法:正常人及无角膜病变的青光眼患者61例99眼,用Tono-Pen眼压计依次测量角膜中心、角膜缘及颞上侧角膜缘后4mm巩膜壁眼压值。结果:角膜中心眼压为(2.52±0.74)kPa,角膜缘为(2.63±0.79)kPa,巩膜壁为(4.46±1.49)kPa。角膜中心和角膜缘眼压差异无统计学意义,而巩膜壁眼压高于角膜中心。角膜中心及巩膜壁眼压呈正相关(r=0.542,P=0.000)。以Y为角膜中心眼压值,X为巩膜壁眼压值,则当X≤2.793kPa,直线回归方程为Y=1.824+0.104X;当X>2.793kPa(高眼压)时,Y=1.493+0.359X。结论:使用Tono-Pen眼压计测量眼压时,巩膜壁眼压值可为真实眼压值提供可靠参考;角膜任何部位均可测得准确眼压值。

可贴敷型压力传感器在眼压测量的可行性应用研究

为解决传统非接触式眼压计(Non-contact Tonometer, NCT)在眼压测量过程中患者体验感差、无法连续监测眼压等问题,将可贴敷型压力传感器模拟“指拭”测量法用于眼压测量。本文选用了型号为ZE120-05AA的可贴敷型压力传感器(灵敏度10 Pa),对门诊569例患者进行了眼压测量,并与非接触式眼压计所测数据进行对比研究。采用皮尔森相关性数据分析方法,发现两组检测数据呈现一定的相关性(r=0.96,P<0.001),两组数据线性拟合的斜率分别为0.068(NCT)和0.079(可贴敷型压力传感器)。结果表明可贴敷型压力传感器在眼压测量方面满足眼压测量的准确性和可靠性,在眼压临床检测应用方面是可行的。

Short-term fluctuation of intraocular pressure and influencing factors following intravitreal injection in patients with retinal vascular diseases

AIM:To investigate the patterns of short-term intraocular pressure(IOP)fluctuations and identify the contributing factors following intravitreal injection in patients with retinal vascular diseases.METHODS:Totally 81 patients were enrolled in this case control study.Eyes were categorized into 7 groups,including age-related macular degeneration(AMD),polypoidal choroidal vasculopathy(PCV),idiopathic choroidal neovascularization(CNV),proliferative diabetic retinopathy(PDR),diabetic macular edema(DME),macular edema secondary to branch(BVOME)and central(CVOME)retinal vein occlusion.IOP was measured in all patients using rebound tonometer at 7 preset time points perioperatively.Additionally,based on the administered medication,the eyes were classified into three treatment groups,including dexamethasone intravitreal implant(IVO),intravitreal conbercept(IVC),and intravitreal ranibizumab(IVR).To compare IOP values at various time points across groups,we employed one-way ANOVA,independent sample t-test or χ^(2) test and multivariate logistic regression analysis.RESULTS:Peak IOP values across all groups were observed at 40s,and 5min after intravitreal injection.Statistical differences in IOP were detected at the 5min among the 7 indication groups(F=2.50,P=0.029).When examing the impact of medications,the IVO group exhibited lower average IOP values at both 40s and 5min compared to the IVC and IVR groups(P<0.001;P=0.007).The IOP values at 40s and 5min were significantly higher in BVOME and CVOME group compared to non-retinal vein occlusionsecondary macular edema(RVOME)group(P<0.001).Multivariate logistic regression analysis further confirmed that IOP measurement at 40s was significantly higher in CVOME group than in non-RVOME group(OR=1.64,95%CI:1.09-2.47;P=0.018).CONCLUSION:Needle size plays a crucial role in the transient changes of IOP following intravitreal injection.Before administering intravitreal injection to patients with central retinal vein occlusion,it is essential to exclude any underlysing causes of increased IOP.

Tono-Pen眼压计在围术期的应用

目的:使用Tono-Pen眼压计对术中眼内压进行监测。方法:选择16例妇科腹腔镜手术病例,分别于不同时点使用Tono-Pen眼压计监测眼内压,将所得结果进行统计学分析。结果:随着头低位和人工气腹时间的延长,患者眼内压进行性升高,人工气腹结束恢复平卧位后,眼内压迅速恢复到术前水平。结论:Tono-Pen眼压计目前是唯一可用于全身麻醉状态下的眼压计,为做好围术期视力保护工作,应重视Tono-Pen眼压计在术中的推广应用,防止视力损害事件的发生。

Impact of corneal parameters on intraocular pressure measurements in different tonometry methods

AIM: To evaluate the impact of central corneal thickness(CCT) and corneal curvature on intraocular pressure(IOP) measurements performed by three different tonometers. METHODS: IOP in 132 healthy eyes of 66 participants was measured using three different tonometry techniques: Goldmann applanation tonometer(GAT), Pascal dynamic contour tonometer(DCT), and ICare rebound tonometer(RT). CCT and corneal curvature were assessed. RESULTS: In healthy eyes, DCT presents significantly higher values of IOP than GAT(17.34±3.69 and 15.27±4.06 mm Hg, P<0.0001). RT measurements are significantly lower than GAT(13.56±4.33 mm Hg, P<0.0001). Compared with GAT, DCT presented on average 2.51 mm Hg higher values in eyes with CCT<600 μm and 0.99 mm Hg higher results in eyes with CCT≥600 μm. The RT results were lower on average by 1.61 and 1.95 mm Hg than those obtained by GAT, respectively. Positive correlations between CCT in eyes with CCT<600 μm were detected for all IOP measurement techniques, whereas a similar relationship was not observed in eyes with thicker corneas. A correlation between IOP values and keratometry in the group with CCT<600 μm was not detected with any of the tonometry methods. In thicker corneas, a positive correlation was found for GAT and mean keratometry values(R=0.369, P=0.005). CONCLUSION: The same method should always be chosen for routine IOP control, and measurements obtained by different methods cannot be compared. All analysed tonometry methods are dependent on CCT;thus, CCT should be taken into consideration for both diagnostics and monitoring.

Comparison among Ocular Response Analyzer,Corvis ST and Goldmann applanation tonometry in healthy children

AIM： To explore the relationship between different parameters of Ocular Response Analyzer（ORA） and Corvis ST（CST） in a sample of healthy Iranian school-aged children and the relationship between parameters of these 2 instruments against intraocular pressure（IOP）, measured by the Goldmann applanation tonometer（GAT-IOP）, age and gender, and find possible correlation between ORA and CST with GAT.METHODS： This cross-sectional study included 90 healthy children. A general interview and complete eye examination were performed. Following successful GATIOP measurement, ORA and CST were conducted. The CST parameters were A 1/2 length（A1 L, A2 L）, A 1/2 velocity（A1 V, A2 V）, highest concavity deformation amplitude（HCDA）, radius of curvature（Ro C）, peak distance（PD）, central corneal thickness（CCT） and IOP. The ORA parameters were corneal hysteresis（CH）, corneal resistance factor（CRF）, Goldmann-correlated IOP（IOP-G） and corneal compensated IOP（IOP-CC）. Extracted data was analyzed using the Statistical Package for Social Science software.RESULTS： Totally 39 males with age of 9.08±1.60（6-12）y and 51 females with age of 8.96±1.55（6-13）y were included. Many CST parameters were significantly correlated with CH, CRF, IOP-G and IOP-CC. Some CST parameters had a significant correlation with GAT-IOP, including IOP-CST in both eyes and HCDA, A2 L, PD, and RoC in the left eye, but none with age, except A2 L in the right eye. The CRF measurement showed a significant correlation with GAT-IOP in both eyes and CH in the right eye, yet, none with age. Among all CST and ORA parameters, CCT-CST in both eyes and A1 L in right eye had a significant correlation with gender, although this was a negligible negative correlation. Comparison of mean IOP values by different devices showed a significantly highest IOP overestimation by CST and lowest by IOP-CC compared with GAT. Also, IOP-G versus IOP-CST significantly had the lowest IOP overestimation among others. Overall, either low positive correlation or negligible correlation was found between IOP measurements by 3 instruments.CONCLUSION： The study finds the highest IOP overestimation by CST and lowest by IOP-CC compared with GAT. Overall, either low positive correlation or negligible correlation is found between IOP measurements by the 3 instruments.

Tono-pen眼压计与Goldmann眼压计对穿透性小梁切除术后患者眼压测量的比较

目的:寻找穿透性小梁切除术后患者眼压测量的简单方法。方法:随机选取行穿透性小梁切除术后3d的患者120例120眼。分别用Goldmann眼压计和Tono-pen眼压计测量眼压,比较两种眼压测量值的差异。结果:120眼中,Goldmann眼压计所测量眼压的平均数值14.69±4.60mmHg。Tono-pen所测眼压的平均数值14.72±4.62mmHg。经统计学检验,P>0.05,Tono-pen眼压计与Goldman眼压计的测量结果无显著性差异。对于穿透性小梁切除术后的眼压测量,Tonopen眼压计与Goldman眼压计的测量结果有高度相关性。Tono-pen眼压计可以准确地估计眼压值。结论:对于穿透性小梁切除术后的的患者眼压在7～32mmHg间时Tono-pen眼压计可以作为一种准确测量眼压的简单方法。

Tono-pen measurement of intraocular pressure under topical anaesthesia in full term normal newborns

AIM: Tono-pen measurement of intraocular pressure(IOP) under topical anaesthesia in full term normal newborns. ·METHODS: The IOP measurements were taken using Tono-pen XL tonometer under topical anaesthesia in 150 newborns(300 eyes) within 24h after birth,over a period of three months,in a university hospital. Gender,gestation period,mode of delivery and birth weight of newborns were noted from medical records. ·RESULTS: There were 70 males and 80 females. All babies were Malays. The IOP measurements were taken between 12 and 24h after birth. The gestation period of babies ranged between 37 and 41 weeks; 118 babies were delivered by spontaneous vaginal delivery and 32 by caesarian section. The birth weight of babies ranged between 2.1 and 4.3kg. The mean IOP of 300 eyes was 15.99±2.79mmHg(range 8-22). There was no statistically significant difference of mean IOP and gender,laterality of eye,type of delivery,gestation age,or birth weight of newborns. ·CONCLUSION: The IOP in full term normal newborns was 16mmHg. Tono-Pen appears to be ideal instrument for taking IOP in newborns because of its small size and easy handling.

Rebound Tonometry in Cataract Surgery: Comparison with Goldmann Applanation Tonometry

Purpose: to compare the rebound tonometer ICare? (RT) with the Goldmann applanation tonometer (GAT) in cataract surgery and to assess the influence of central corneal thickness (CCT) on intraocular pressure (IOP) measurements. Design: retrospective, comparative study. Methods: a total of 472 patients underwent IOP measurement using RT (time 0 = RTa). GAT IOP measurement was performed 5 minutes later, followed by a second RT IOP measurement after other 5 minutes (RTa + 10 min = RTb). CCT was obtained by ultrasound pachymetry. In 106 patients IOP was measured by means of RT and GAT before clear corneal cataract surgery (RT1 and GAT1) and at one day postoperatively (RT2 and GAT2). Results: RT IOP values > 5 mmHg were overestimated, while RT IOP values Conclusion: our results showed a good agreement between measurements obtained with RT and GAT in pre and postoperative cataract surgery, although a significant statistically difference was found between RT and GAT measurements performed postoperatively. Moreover, CCT is a parameter to be considered for the IOP measurement, especially for values obtained with RT.