·AIM: To compare IOPen and ICare rebound tonometry to Goldmann applanation tonometry(GAT) according to International Standards Organization(ISO) 8612 criteria.·METHODS: Totally 191 eyes(n =107 individuals) w...·AIM: To compare IOPen and ICare rebound tonometry to Goldmann applanation tonometry(GAT) according to International Standards Organization(ISO) 8612 criteria.·METHODS: Totally 191 eyes(n =107 individuals) were included. Criteria of ISO 8612 were fulfilled: 3 clusters of IOP, measured by GAT, were formed. The GAT results were given as mean±standard deviation.·RESULTS: GAT(19.7±0.5 mm Hg) showed a significant correlation to ICare(19.8±0.5 mm Hg)(r =0.547, P <0.001)and IOPen(19.5 ±0.5 mm Hg)(r =0.526, P <0.001).According to ISO 8612 criteria in all 3 IOP groups the number of outliers(of the 95% limits of agreement)exceeded 5% for ICare and IOPen vs GAT: No.1(n =68)29.4% and 22.1%, No.2(n =62) 35.5% and 37.1%, No.3(n =61) 26.2% and 42.6%, respectively.·CONCLUSION: The strict requirements of the ISO 8612 are not fulfilled in a glaucoma collective by ICare and IOPen at present. As long as the Goldmann tonometry is applicable it should be used first of all for reproducible IOP readings. ICare and IOPen tonometry should be considered as an alternative tool, if application of Goldmann tonometry is not possible.展开更多
AIM:To compare the accuracy of IOPen rebound tonometer with Goldmann applanation tonometer(GAT) in individuals with low,normal and high intraocular pressure(IOP) and to evaluate the effect of central corneal thickness...AIM:To compare the accuracy of IOPen rebound tonometer with Goldmann applanation tonometer(GAT) in individuals with low,normal and high intraocular pressure(IOP) and to evaluate the effect of central corneal thickness(CCT) on IOP measurements.METHODS:This cross-sectional study consisted of 159 participants.IOP of one eye of each subject was measured consecutively with IOPen and GAT.Then CCT was measured using an ultrasonic pachymeter.Based on GAT IOP readings,participants were divided into low,normal and high IOP groups.Correlation between tonometers and CCT was calculated by spearman's correlation coefficient.Agreement between tonometers was evaluated using Bland-Altman method.RESULTS:Non-significant underestimation of IOP by IOPen was observed in low IOP group(Mean difference:0.20mmHg;P=0.454) and also in normal IOP group(Mean difference:0.56mmHg;P=0.065).However,IOPen significantly overestimated IOP in high IOP group(Mean difference:1.06mmHg;P=0.038).The 95% limits of agreement(LoA) width between IOPen and GAT IOPs were 7.84,8.57 and 14.27mmHg in low,normal and high IOP groups,respectively.Low IOP group had thinner corneas compared to high IOP group(P=0.034).IOP measurements taken by IOPen were not influenced by CCT(P=0.099) while poor correlation between CCT and GAT was found(R=0.17,P=0.032).Using receiver operating characteristic(ROC) curve,cutoff value of 18.75mmHg was determined for IOPen with sensitivity of 98.1 and specificity of 97.2%.CONCLUSION:Accuracy of IOPen is comparable to GAT in patients with low or normal IOP but IOPen overestimates IOP at high IOP levels.CCT does not affect IOP readings with IOPen.展开更多
文摘·AIM: To compare IOPen and ICare rebound tonometry to Goldmann applanation tonometry(GAT) according to International Standards Organization(ISO) 8612 criteria.·METHODS: Totally 191 eyes(n =107 individuals) were included. Criteria of ISO 8612 were fulfilled: 3 clusters of IOP, measured by GAT, were formed. The GAT results were given as mean±standard deviation.·RESULTS: GAT(19.7±0.5 mm Hg) showed a significant correlation to ICare(19.8±0.5 mm Hg)(r =0.547, P <0.001)and IOPen(19.5 ±0.5 mm Hg)(r =0.526, P <0.001).According to ISO 8612 criteria in all 3 IOP groups the number of outliers(of the 95% limits of agreement)exceeded 5% for ICare and IOPen vs GAT: No.1(n =68)29.4% and 22.1%, No.2(n =62) 35.5% and 37.1%, No.3(n =61) 26.2% and 42.6%, respectively.·CONCLUSION: The strict requirements of the ISO 8612 are not fulfilled in a glaucoma collective by ICare and IOPen at present. As long as the Goldmann tonometry is applicable it should be used first of all for reproducible IOP readings. ICare and IOPen tonometry should be considered as an alternative tool, if application of Goldmann tonometry is not possible.
基金Ahvaz Jundishapur University of Medical Sciences Ahvaz,Iran
文摘AIM:To compare the accuracy of IOPen rebound tonometer with Goldmann applanation tonometer(GAT) in individuals with low,normal and high intraocular pressure(IOP) and to evaluate the effect of central corneal thickness(CCT) on IOP measurements.METHODS:This cross-sectional study consisted of 159 participants.IOP of one eye of each subject was measured consecutively with IOPen and GAT.Then CCT was measured using an ultrasonic pachymeter.Based on GAT IOP readings,participants were divided into low,normal and high IOP groups.Correlation between tonometers and CCT was calculated by spearman's correlation coefficient.Agreement between tonometers was evaluated using Bland-Altman method.RESULTS:Non-significant underestimation of IOP by IOPen was observed in low IOP group(Mean difference:0.20mmHg;P=0.454) and also in normal IOP group(Mean difference:0.56mmHg;P=0.065).However,IOPen significantly overestimated IOP in high IOP group(Mean difference:1.06mmHg;P=0.038).The 95% limits of agreement(LoA) width between IOPen and GAT IOPs were 7.84,8.57 and 14.27mmHg in low,normal and high IOP groups,respectively.Low IOP group had thinner corneas compared to high IOP group(P=0.034).IOP measurements taken by IOPen were not influenced by CCT(P=0.099) while poor correlation between CCT and GAT was found(R=0.17,P=0.032).Using receiver operating characteristic(ROC) curve,cutoff value of 18.75mmHg was determined for IOPen with sensitivity of 98.1 and specificity of 97.2%.CONCLUSION:Accuracy of IOPen is comparable to GAT in patients with low or normal IOP but IOPen overestimates IOP at high IOP levels.CCT does not affect IOP readings with IOPen.
