Pentacam及A型超声测量近视眼前房深度、晶状体厚度的研究

Clinical measurement of anterior chamber depth and lens thickness in myopic eyes with ultrasound and pentacam scheinpflug system

目的探讨Pentacam测量近视眼前房深度(ACD)和晶状体厚度(LT)的结果与A型超声测量结果的一致性。方法38例(38眼)分别检查眼压,电脑验光、综合验光,扩瞳后应用Pentacam及A型超声分别测量ACD和LT。结果Pentacam测得的ACD的值为(3.33±0.24)mm,A型超声测得的ACD的值为(3.81±0.24)mm,两者之间差异有统计学意义(P<0.01),相关性为0.967(P<0.01)。Pentacam测得的LT值为(3.34±0.26)mm,A型超声测得的LT值为(3.54±0.17)mm,两者之间差异有统计学意义(P<0.01),相关性为0.815(P<0.01)。随着近视度数的增加,Pentacam与A型超声测量LT之间的差异也变大(r=-0.328,P<0.05)。结论Pentacam作为一种新型的三维眼前节分析诊断系统,在测量ACD和LT方面与A型超声仍有一定差异,在临床工作中应综合分析。

Objective Anterior chamber depth （ACD） and lens thickness（LT） measurement gives important details in cataract or glaucoma stlrgery. And ACD is also strictly required in refractive surgery, such as excimer laser photorefractive keratectomy or phakic anterior ehamber lens implant. This investigation was to assess the accuracy of ultrasound and Pentaeam scheinpflug imaging system measuring ACD,LT in myopic eyes. Methods Thirty-eight eyes of 38 subjects aged 18 -28 years underwent non-contact tonometry, autorefraction and subjective refraction examination. After accommodative paralysis, ACD and LT from 38 right eyes were measured with scheimplug imaging system（Pentacam） and A sonography. Results The ACD value measured by Pentacam and A sonography was（ 3.33± 0. 24 ）mm and（ 3.81±0.24） ram, respectively, indicating a significant difference between the results of these two methods （ P 〈 0.01 ） and a positive linear correlation between them （ r = 0. 967, P 〈 0.01 ）. The LT value measured by Pentacam and A sonography was（3.34±0. 26） mm and（3.54±0. 17） mm respectively with the significant difference （ P 〈0.01 ） and a significant linear correlation between these two outcomes （ r =0. 815 ,P 〈0.01 ）. The difference in LT between the two methods was higher with the increase of diopter of refractive error, Conclusion Pentacam,as a new 3-dimensional mathematical model of the anterior segment, presents some different results from A sonography in the measurement of ACD and LT. Enough consideration should be payed to clinical evaluation of these results.