AIM:To compare the differences and consistency of IOL-Master 700 biometers applying swept optical coherence tomography with the conventional IOL-Master 500 applying partial coherence interference in terms of the ocula...AIM:To compare the differences and consistency of IOL-Master 700 biometers applying swept optical coherence tomography with the conventional IOL-Master 500 applying partial coherence interference in terms of the ocular biological parameters in adolescents with ametropia.METHODS:A total of 110 adolescents(110 eyes)with ametropia were collected,including 55 males and 55 females;age 10.69±2.81 y.Ocular biological measurements were taken by IOL-Master 700 and IOL-Master 500 respectively to obtain biological parameters including axial length(AL),mean corneal anterior surface keratometry(K_(m)),anterior chamber depth(ACD),and horizontal corneal diameter(WTW).Paired t-test was used to compare the differences between the two instruments.The intra-group correlation coefficient(ICC)and the Bland-Altman analysis were used to evaluate the consistency of parameter measurements between the two instruments for the four biological parameters.RESULTS:Statistical analysis showed that there was no significant difference in the K_(m)value measured by IOL-Master 700 and IOL-Master 500(t=-1.644,P=0.116).The average differences of the AL,ACD,and WTW distances between the two instruments are 0.028,0.101 and 0.064 mm respectively,and the differences are statistically significant(t=2.644,12.505,3.911,P<0.001).The consistency study results indicated high correlation in the measurement of AL,K_(m),ACD and WTW between the two instruments(ICC=0.994,0.873,0.927,0.912).CONCLUSION:The novel biometric instrument IOL-Master 700 makes no difference with IOL-Master 500 in the measurement of K_(m).There are some differences in the values of AL,ACD,and WTW.However,the two instruments show good consistency in these four biological measurements.The measured values of K_(m)are interchangeable between the instruments.These two types of biometrics can be used as mutual reference in consideration of that the differences in AL,ACD,and WTW measurements are not sufficient to produce clinically meaningful differences.展开更多
Background: The availability of premium intraocular lenses (IOL), including toric, multifocal, and EDOF, has become very sophisticated and now demands accurate biometric measurement accuracy. The Pentacam AXL and IOL ...Background: The availability of premium intraocular lenses (IOL), including toric, multifocal, and EDOF, has become very sophisticated and now demands accurate biometric measurement accuracy. The Pentacam AXL and IOL Master 700 are often used for optical biometry and they are available in the market today. They can also be used to measure the parameters needed in the IOL calculation using the latest generation formulas, such as the Barett Universal II. Therefore, this study aims to compare the accuracy of refraction results between Pentacam AXL compared to IOL Master 700 after cataract surgery with the Barett Universal-II formula. Method: A total of 64 eyes from 64 patients who had a preoperative examination with IOL Master 700 and Pentacam AXL were included in this study. Parameters such as K, ACD, LT, WTW, and AL were then compared between the two tools. Prediction error values were also calculated and compared based on the difference between the Spherical equivalent (SE) of subjective refraction results after 4 weeks of surgery with their refractive prediction targets. Results: There was no statistically significant difference in the parameters measured from the two tools except ACD and WTW. Furthermore, LT was difficult to obtain on the Pentacam AXL due to penetration problems, as well as in patients with significant lens opacities. The percentage of error prediction values that reach ± 0.50 D on Pentacam AXL and IOL Master 700 was 70.3% and 73.5%, respectively. However, the average prediction error that was close to emmetropia with IOL Master 700 was greater compared to the other tool. Conclusion: Pentacam AXL has a fairly good accuracy for refraction prediction compared to IOL Master 700. However, it is still necessary to optimize its constants to obtain optimal results.展开更多
文摘AIM:To compare the differences and consistency of IOL-Master 700 biometers applying swept optical coherence tomography with the conventional IOL-Master 500 applying partial coherence interference in terms of the ocular biological parameters in adolescents with ametropia.METHODS:A total of 110 adolescents(110 eyes)with ametropia were collected,including 55 males and 55 females;age 10.69±2.81 y.Ocular biological measurements were taken by IOL-Master 700 and IOL-Master 500 respectively to obtain biological parameters including axial length(AL),mean corneal anterior surface keratometry(K_(m)),anterior chamber depth(ACD),and horizontal corneal diameter(WTW).Paired t-test was used to compare the differences between the two instruments.The intra-group correlation coefficient(ICC)and the Bland-Altman analysis were used to evaluate the consistency of parameter measurements between the two instruments for the four biological parameters.RESULTS:Statistical analysis showed that there was no significant difference in the K_(m)value measured by IOL-Master 700 and IOL-Master 500(t=-1.644,P=0.116).The average differences of the AL,ACD,and WTW distances between the two instruments are 0.028,0.101 and 0.064 mm respectively,and the differences are statistically significant(t=2.644,12.505,3.911,P<0.001).The consistency study results indicated high correlation in the measurement of AL,K_(m),ACD and WTW between the two instruments(ICC=0.994,0.873,0.927,0.912).CONCLUSION:The novel biometric instrument IOL-Master 700 makes no difference with IOL-Master 500 in the measurement of K_(m).There are some differences in the values of AL,ACD,and WTW.However,the two instruments show good consistency in these four biological measurements.The measured values of K_(m)are interchangeable between the instruments.These two types of biometrics can be used as mutual reference in consideration of that the differences in AL,ACD,and WTW measurements are not sufficient to produce clinically meaningful differences.
文摘Background: The availability of premium intraocular lenses (IOL), including toric, multifocal, and EDOF, has become very sophisticated and now demands accurate biometric measurement accuracy. The Pentacam AXL and IOL Master 700 are often used for optical biometry and they are available in the market today. They can also be used to measure the parameters needed in the IOL calculation using the latest generation formulas, such as the Barett Universal II. Therefore, this study aims to compare the accuracy of refraction results between Pentacam AXL compared to IOL Master 700 after cataract surgery with the Barett Universal-II formula. Method: A total of 64 eyes from 64 patients who had a preoperative examination with IOL Master 700 and Pentacam AXL were included in this study. Parameters such as K, ACD, LT, WTW, and AL were then compared between the two tools. Prediction error values were also calculated and compared based on the difference between the Spherical equivalent (SE) of subjective refraction results after 4 weeks of surgery with their refractive prediction targets. Results: There was no statistically significant difference in the parameters measured from the two tools except ACD and WTW. Furthermore, LT was difficult to obtain on the Pentacam AXL due to penetration problems, as well as in patients with significant lens opacities. The percentage of error prediction values that reach ± 0.50 D on Pentacam AXL and IOL Master 700 was 70.3% and 73.5%, respectively. However, the average prediction error that was close to emmetropia with IOL Master 700 was greater compared to the other tool. Conclusion: Pentacam AXL has a fairly good accuracy for refraction prediction compared to IOL Master 700. However, it is still necessary to optimize its constants to obtain optimal results.
