ICare回弹式眼压计与NCT测量结果的比较

目的：比较ICare回弹式眼压计（ICareRBT）和非接触眼压计（NCT）测量值的一致性,评价ICareRBT的测量精确性。方法：对113例222眼（右眼111眼,左眼111眼）随机使用NCT和ICare回弹式眼压计测量眼压,对两种眼压计所测眼压值的差异采用配对t检验分析法,对ICare所测眼压值随NCT所测值变化的关系分析采用线性回归分析法,对ICare与NCT眼压测量值的一致性采用Bland-Altman分析法。结果：使用ICareRBT和NCT测得的眼压均值分别为18.46±8.50mmHg和17.09±8.32mmHg,二者差值为1.36±1.52mmHg,两种测量方法Pearson相关因子r为0.984。Bland-Altman分析证实ICareRBT与NCT眼压测量值具有良好的一致性。所有受试者对ICareRBT的测量无不适反应。结论：ICareRBT与NCT测量值间具有高度的相关性,可以作为可靠的筛查工具,并可以在临床广泛应用。     

非接触式眼压计与回弹式眼压计在眼压测量中的准确度分析

目的：分析非接触式眼压计(non contact tonometer,NCT)、ICare回弹式眼压计(ICare rebound tonometer,RBT)在青光眼患者中眼压测量结果的准确性。

方法：回顾性病例对照研究。选取青光眼患者113例185眼。用RBT、NCT和Goldmann眼压计(GAT)分别于9：00、16：00两次进行眼压测量并记录为两组数据,分别用秩和检验、国际标准8621指南评估其准确性,Bland-Altman一致性分析两组测量结果的一致性,并以GAT测量值作为标准将数据分为异常眼压组(<10mmHg或>21mmHg)和正常眼压组(10～21mmHg),在不同组间分析其一致性。应用Spearman相关分析眼压计间的相关性。

结果：GAT、NCT和RBT三组测量值间存在差异(P<0.01); GAT获得的眼压测量值与RBT和NCT测量值间存在相关性(r_s=0.71、0.77,P<0.001)。NCT与GAT测量值接近(P=0.92),而RBT与GAT相比,眼压测量值较高(P<0.05)。然而NCT、RBT同GAT相比一致性界限范围均较宽,分别为-6.2～6.0、-5.2～7.6mmHg,在正常眼压组一致性界限范围分别为-5.9～5.9、-4.3～7.5mmHg,在非正常眼压组分别为-7.3～6.4、-7.5～5.6mmHg。根据ISO 8612指南进行评价,NCT和RBT在三组中超过95%的一致性限制的异常值分别为3.9%、11.3%、12.2%和26.3%、11.3%、12.2%。

结论：NCT和RBT均不能简单代替GAT用于青光眼患者眼压的测量。在青光眼患者中,随着测量值偏离正常眼压范围,NCT和RBT的测量误差也有所增大。     

ICARE回弹式眼压计与NCT眼压计测量结果的比较

目的:讨论ICARE回弹式眼压计的临床性能。方法:对78例156眼同时用ICARE回弹式眼压计和NCT眼压计进行眼压测量,对比分析两种眼压计的测量结果及两者的相关情况;观察ICARE眼压计对特殊病例测量的结果。结果:ICARE眼压计和NCT眼压计测得的眼压均值分别为16.55±8.54mmHg和16.81±7.35mmHg,两者无显著差别。两种眼压计测量值显著相关,相关系数为0.964。ICARE眼压计可较好地完成角膜病变和无固视能力等病例的眼压测量。结论:ICARE眼压计可以在临床上运用,尤其适用于其它眼压计测量困难的病例。     

Noninvasive measurement of rodent intraocular pressure with a rebound tonometer

PURPOSE: The present study evaluated the applicability of a rebound tonometer in measuring intraocular pressure (IOP) in rats and mice. METHODS: The accuracy of the TonoLab rebound tonometer was determined in cannulated mouse and rat eyes. IOP was manipulated by changing reservoir height, and tonometer pressure readings were recorded by an independent observer. IOP values were recorded in conscious Wistar rats and in four different strains of mice. The effects of anesthesia on IOP were evaluated in two different strains of mice. RESULTS: The IOP readings generated by the rebound tonometer correlated very well with the actual pressure in the eye. In rats, this linear correlation had a slope of 0.96 +/- 0.05 (mean +/- SEM, n = 4) and a Y-intercept of -2.1 +/- 1.2. In mice, the slope was 0.99 +/- 0.05 (n = 3), and the Y-intercept was 0.8 +/- 1.4. Using this method, the resting IOP of conscious male Wistar rats was observed to be 18.4 +/- 0.1 mm Hg (n = 132). In mice, strain differences in IOP were detected. Baseline IOP values in Balb/c, C57-BL/6, CBA, and 11- to 12-month-old DBA/2J mice were 10.6 +/- 0.6, 13.3 +/- 0.3, 16.4 +/- 0.3, and 19.3 +/- 0.4 mm Hg (n = 12), respectively. In separated studies, anesthesia lowered IOP from 14.3 +/- 0.9 to 9.2 +/- 0.5 mm Hg (n = 8) in C57-BL/6 mice, and from 16.6 +/- 0.4 to 9.4 +/- 0.6 mm Hg (n = 10) in CBA mice. CONCLUSIONS: The rebound tonometer was easy to use and accurately measured IOP in rats and mice. This technique, together with advances in genetic and other biological studies in rodents, will be valuable in the further understanding of the etiology and pathology of glaucoma.     

Comparison of the ICare rebound tonometer with the Goldmann applanation tonometer by experienced and inexperienced tonometrists

PURPOSE: To assess the agreement between ICare rebound tonometer and Goldmann applanation tonometer in the hands of experienced and inexperienced tonometrists. PATIENTS AND METHODS: Two tonometrists, experienced with both Goldmann applanation tonometry (GAT) and ICare Tonometry (ICT) measured intraocular pressure (IOP), in a masked fashion, in 100 patients. In another series of 58 patients, ICT was performed by an inexperienced tonometrist and GAT by an experienced tonometrist. RESULTS: In approximately 80% of patients, the difference in IOP between GAT and ICT was 相似文献   

Reproducibility and tolerability of the ICare rebound tonometer in school children

PURPOSE: To establish the intraobserver and interobserver reliability of the rebound tonometer (RBT) in healthy schoolchildren and to test patient tolerance in an unanesthetized eye. SUBJECTS AND METHODS: To examine the reproducibility of the RBT, 2 experienced ophthalmologists undertook 3 consecutive intraocular pressure (IOP) measurements with the RBT without an anesthetic in 304 eyes of 152 healthy schoolchildren. Any pain or discomfort experienced by the children was recorded. Intraobserver and interobserver reliabilities were established by calculating correlation coefficients (r). RESULTS: Of the 152 patients, 78 (51.3%) were males and 74 (48.7%) were females. The mean patient age was 11.2+/-2.6 years (range: 7 to 15 y). Mean IOP values obtained by examiners 1 and 2 were 16.48+/-2.82 mm Hg and 17.27+/-3.27 mm Hg for the right eyes and 17.15+/-3.36 mm Hg and 17.06+/-3.21 mm Hg for the left eyes. Intraobserver correlation coefficients for examiner 1 were 0.970 for the right eyes and 0.974 for the left eyes. For examiner 2, intraobserver correlation coefficients were 0.963 for the right eyes and 0.970 for the left eyes. The interobserver correlation coefficients were 0.798 for the right eyes and 0.858 for the left eyes (all P<0.0001). With the RBT, 98.6% of the subjects felt no pain and/or discomfort. CONCLUSIONS: Measurement of IOP with the RBT is a highly reproducible method in schoolchildren showing high intraobserver and interobserver correlation and it seems to be very comfortable when performing IOP measurements in schoolchildren without an anesthetic.     

Icare回弹式眼压计与Goldmann压平眼压计眼压测量结果的比较

背景Icare回弹式眼压计作为一种新式眼压计,有必要对它的临床应用价值进行评估。目的通过比较分析Icare回弹式眼压计和Goldmann压平眼压计（GAT）的眼压测量结果,探讨Icare的临床价值。方法可疑青光眼、青光眼、屈光不正及部分健康体检者78例共152眼同时接受Icare、GAT眼压测量,受检眼先行Icare测量,然后再进行GAT测量,2次测量间隔3～5min。对比分析两种眼压计的测量结果。结果使用Icare和GAT测得的眼压均值分别为（19．16±5．03）mmHg和（18．41±4．52）mmHg,96眼（63．2％）两者的眼压差值≤1mmHg,二者的测量值差异虽有统计学意义,但二者的变化呈明显正相关（r=0．940,P〈0．01）。当Icare眼压测量值〈16mmHg时,Icare的眼压测量值低于GAT,而当Icare眼压测量值≥16mmHg时恰好相反;CCT偏薄、正常以及偏厚的情况下,Icare的眼压测量值均高于GAT的眼压测量值。Icare、GAT的眼压测量值和CCT间呈正相关（r=0．341,P〈0．01;r=0．333,P〈0．01）。结论与GAT眼压计比较,Icare回弹式眼压计易操作,测量结果可靠,临床实用性更强。     

Comparison of ICare tonometer with Goldmann applanation tonometer in glaucoma patients

PURPOSE: To compare the intraocular pressure (IOP) readings taken with the new ICare tonometer and with the Goldmann applanation tonometer (GAT) and to evaluate the influence of central corneal thickness (CCT) on the IOP measurements. PATIENTS AND METHODS: One eye of 178 consecutive patients with primary open-angle glaucoma underwent ultrasonic CCT measurement, followed by IOP evaluation with the GAT and with the ICare tonometer. The deviation of ICare readings from GAT values, corrected according to the Doughty and Zaman formula, was calculated and correlated to CCT by a linear regression model. The agreement between the 2 devices was assessed by use of the Bland-Altman method. RESULTS: The average CCT was 552+/-39 mum. The mean IOP and the mean corrected IOP with GAT were 19.4+/-5.4 mm Hg, and 18.5+/-5.7 mm Hg, respectively. The mean ICare IOP reading was 18.4+/-5.2 mm Hg. The deviations of ICare readings from corrected GAT values were highly correlated with CCT values (r=0.63, P<0.01). Linear regression analysis showed that a CCT change of 10 mum resulted in an ICare reading deviation of 0.7 mm Hg. The Bland-Altman scatter-plot showed a reasonable agreement between the 2 tonometers. CONCLUSIONS: The ICare tonometer can be useful in a routine clinical setting. The IOP readings are quite in accordance with those obtained by GAT. The measurements seemed to be influenced by CCT variations, and thus pachymetry should always be taken into consideration.     

A new rebound tonometer for home monitoring of intraocular pressure

Background  

To compare intraocular pressure (IOP) measurements obtained by the Icare ONE rebound tonometer (RTONE) and the Goldmann applanation tonometer (GAT) in healthy persons and glaucoma patients in a prospective study, and to investigate the influence of central corneal thickness (CCT).     

Assessing intraocular pressure by rebound tonometer in rats with an air-filled anterior chamber

Purpose  To compare rebound tonometer and cannulation as methods for measuring intraocular pressure (IOP) in rats. Methods  The accuracy of the TonoLab rebound tonometer was determined in eight cannulated rat eyes. IOP was manipulated by changing air pressure from 20 to 100 mmHg at 10-mmHg intervals, and the IOP was measured with the rebound tonometer at each level. The average value of three repeated pressure readings was recorded. Correlation analysis and comparison with the Bland and Altman method were performed. The intraclass correlation coefficient was calculated to assess intraoperator variability. Results  The IOP values measured with the TonoLab rebound tonometer were well correlated with the actual IOP (r ² = 0.963, P = 0.01). The mean of the difference between the rebound tonometer and actual (cannulation) IOP was 7.41 ± 7.87%. The intraclass correlation coefficient was 0.9, indicating low intraoperator variability. Conclusions  The rebound tonometer showed high accuracy and reliability for IOP measurement in rat eyes.     

Accuracy of the ICare rebound tonometer in glaucomatous eyes with topical ocular hypotensive medication.

BACKGROUND: The purpose of this study was to assess the accuracy of the ICare tonometer, using the Perkins applanation tonometer (AT) as the reference, in a sample population being treated with travaprost 0.004% for glaucoma. MATERIAL AND METHODS: Twenty-eight consecutive patients with open-angle glaucoma or ocular hypertension who had been receiving travaprost 0.004% to control elevated intraocular pressure (IOP) were included in the study. IOP was measured in the entire sample with ICare and Perkins AT. The difference between the methods was plotted against the mean to compare the tonometers. The hypothesis of zero bias was examined by a paired t-test. The 95% limits of agreement (LoA) were also calculated. RESULTS: As previously found in young healthy subjects, ICare showed a tendency to overestimate Perkins IOP measurements by a mean of 3.57 mmHg. The agreement between the two methods is shown by the 95% LoA which was from -9.37 to +2.23 mmHg: 53% of the IOP differences fell within +/-3 mmHg. Conclusions: The performance of the ICare tonometer in glaucomatous patients being treated with travaprost 0.004% to lower the IOP appears to be similar to that of young healthy patients. The tendency of ICare to overestimate the IOP readings should be considered when the instrument is used in the follow-up of glaucomatous patients.     

Agreement of rebound tonometer in measuring intraocular pressure with three types of applanation tonometers

PURPOSE: To evaluate the agreement of iCare rebound tonometer in measuring intraocular pressure (IOP) with Goldmann applanation tonometer (GAT), Tonopen XL, and noncontact tonometer, and the influence of the central corneal thickness (CCT) on IOP measurements made with these four tonometers in 45 (12 control and 33 glaucomatous or ocular hypertensive) eyes. DESIGN: Clinically relevant experimental study. METHODS: Tonometer intermethod agreement was assessed by the Bland-Altman method. The relations of CCT with absolute IOP values and intertonometer differences were analyzed by linear regression. RESULTS: The mean differences (95% limits of agreement) in IOP readings between iCare and GAT, Tonopen XL, and noncontact tonometer were 1.40 +/- 4.29, 0.00 +/- 4.78, and 2.22 +/- 4.19 mm Hg, respectively. All tonometries had a marked association with CCT. As the CCT got thicker, iCare considerably overestimated GAT and Tonopen XL. CONCLUSIONS: Although influenced by CCT, iCare agrees well with applanation tonometers.     

1岁以下婴儿ICare手持回弹式眼压计眼压正常值及RetCam检查对其影响的研究

目的 分析1岁以下婴儿正常眼压值及眼底广域数字成像系统（RetCam3）视网膜筛查对眼压的影响。设计前瞻性病例系列。研究对象2019～2020年于广东省妇幼保健院行筛查的≤1岁婴儿285例（570眼）,其中男性176例。选择同期在我院门诊就诊且眼压正常的成年人102例（204眼）作为对照。方法使用ICare手持回弹式眼压计测量婴儿RetCam3筛查前后的眼压值,比较筛查前后眼压变化及其与成年人的异同。主要指标眼压。结果婴儿双眼平均眼压（13.04±3.04） mmHg,左、右眼眼压差异无统计学意义（t=-1.68,P=0.10）。成年人双眼平均眼压（16.82±2.36）mmHg,婴儿眼压较成年人低（t=-18.14,P<0.01）。不同性别婴儿的眼压比较无统计学意义（t=0.20,P=0.85）。行RetCam3眼底检查后眼压（13.93±3.20） mmHg较检查前眼压（12.88±3.12） mmHg升高（t=5.09,P<0.01）,出生时胎龄<32周组眼底检查前后眼压的差值（1.64±3.76）mmHg高于≥32周组（0.75±3.22）mmHg（t=2.1...     

Age differences in central and peripheral intraocular pressure using a rebound tonometer

AIM: To evaluate the influence of age on the measurements and relationships among central and peripheral intraocular pressure (IOP) readings taken with a rebound tonometer. METHODS: The IOPs were measured using the ICare rebound tonometer on the right eyes of 217 patients (88 men and 129 women) aged 18-85 years (mean 45.9 (SD 19.8) years), at the centre and at 2 mm from the nasal and temporal limbus along the horizontal meridian. Three age groups were established: young (< or =30 years old; n = 75), middle aged (31-60 years old; n = 77) and old patients (>60 years old; n = 65). RESULTS: A high correlation was found between the central and peripheral IOP readings, with the central readings being higher than the peripheral ones. Higher IOP values for the central location were found in the younger patients. Older patients had significantly lower temporal IOP readings than those for the remaining two groups (p<0.001), whereas no significant differences were found among groups when IOP was measured at the central and nasal locations. A significant decrease was observed in the nasal and temporal IOP readings as the age increased (p = 0.011 and 0.006, respectively). CONCLUSION: Older patients had lower IOP values than the middle-aged and younger patients in the temporal peripheral location. A negative correlation was found between age and IOP by rebound tonometry in the corneal periphery but not in its centre.     

Assessment of IcareONE rebound tonometer for self‐measuring intraocular pressure

Purpose: To evaluate the precision of the IcareONE rebound tonometer, which was developed for self‐measuring intraocular pressure (IOP) and to compare IcareONE measurement with Goldmann applanation tonometry (GAT). Methods: Twenty‐four healthy eyes and 81 glaucomatous eyes were enrolled. IOP measurements (three times per session) with IcareONE were made in a random order by an ophthalmologist (Icare(O)) and by the subject (Icare(S)). Intraclass correlation coefficients (CCs), kappa values and mean values of IOP were compared among the two types of Icare recordings and GAT. Bland–Altman analysis was used to assess agreement between methods. Multiple regression analysis was performed to identify the subject factors that influenced the discordant measurements between IcareONE and GAT. Results: The mean value of Icare(O) and Icare(S) measurements was 13.5 ± 5.2 and 13.5 ± 5.4 mmHg, respectively, neither of which was significantly different from GAT (13.8 ± 4.4). The intrarater CC of Icare(O) and Icare(S) was 0.968 and 0.885, respectively. The intermethod CC and weighted kappa between Icare(O) and Icare(S) were 0.907 and 0.684, respectively. All pairwise correlations between the two types of IOP measurement showed coefficients of determination >0.8. Bland–Altman analysis did not show any proportional biases. Multiple regression analysis revealed that the differences between GAT and Icare(O) or Icare(S) were positively correlated with central corneal thickness (CCT) and negatively correlated with age. Conclusions: Intraocular pressure measurements with IcareONE by a physician and by the subject showed excellent agreement with GAT measurements; IcareONE measurements between a physician and the subject had high intrarater reliability, and good agreement thicker CCT led IcareONE measurement to overestimate IOP, while higher age caused it to underestimate IOP compared with GAT.