摘要
目的探讨相干光生物测量法在特殊老年性白内障群体中应用的可行性,为该方法在临床上的进一步开发利用提供参考。方法用Zeiss IOLMaster3.02相干光生物测量仪（PCI）和QMC5.03接触式A型超声生物测量仪（A超）分别测量防盲筛查中确诊的老年性白内障患者365例365眼的眼球轴长。其中男92例,女273例,平均年龄（75.0±6.8）岁（56～92岁）。将患者术前裸眼视力分为5级：光感、手动、数指、〉0.02～0.1、〉0.1～0.4,并记录白内障混浊程度及其它可能影响测量的因素。用PCI测量时,若信噪比（SNR）小于2.0,则属测量失败。专人操作,检查结果打印存档。结果PCI测量成功186眼,占51.0%;测量失败179眼,占49.0%。在测量失败者中,因晶状体混浊者（包括全混浊118例、核性混浊24例、皮质性混浊14例、后囊下混浊13例）169例,占94.4%,因其它原因者（包括角膜瘢痕1例、斜视2例、胬肉3例、原因不明4例）10例,占5.6%。两种方法显著相关,r=0.99,P〈0.001。PCI的结果比A超的结果平均大（0.23±0.26）mm,P〈0.001。在5级裸眼视力者中,裸眼视力越好,则PCI的测量成功率越高。A超除1例因患者不能合作而未能测量外，其余364例全部测量成功。结论在本组防盲筛查中确诊的老年性白内障患者中，晶状体混浊和术前裸眼视力差是导致PCI测量失败的主要原因。PCI的测量结果与A超的测量结果具有高度一致性，但是前者比后者平均大（0．23±0．26）mm。PCI用于近熟期和成熟期老年性白内障的眼球轴长测量有一定的局限性，目前仍不能取代传统的A超生物测量法。
Objective To evaluate the application of partial coherence interferometry （PCI） in a special group of senile cataract patients, and to offer the evidence for further usage of PCI in clinic. Methods Zeiss IOLMaster3.02 and QMC 5.03 ultrasonic A-scan are used sequentially in a group of senile cataract patients screened out in a blind prevention project. The group contains 365 cases（365 eyes） with average age （75.0 ± 6.8） years（56±92years）. The uncorrected visual acuity is assorted to five levels： light perception, hand move, count finger, 〉0.02-0.1 and 〉0.1-0.4. The state of lens opacity and the possible causes of measurement failure are recorded. Measurements with the signal noise ratio（SNR） less than 2.0 are regarded as failure. Restilts Measurements with PCI are success in 186 eyes（51.0%）, and are failed in 179 eyes（49.0%）. Among failed cases, lens opacity is the main cause. The two methods are highly correlated（r=0.99, P〈0.001 ）. The mean result of PCI is higher than that of A-scan with the difference of （0.23 ± 0.26）mm（P〈0.001）. It is found that the higher level of uncorrected visual acuity, the higher measurement success rate. Only one case can＇t be measured with ultrasonic A-scan. Conclusions Lens opacity is the main cause of PCI measurement failure in this special group of senile cataract patients. Uncorrected visual acuity can predict the measurement possibility with PCI. PCI has some limitation in the biometry of mature or near mature senile cataract eyes and can＇t substitute conventional ultrasonic A-scan in certain cataract cases at present.
出处
《中国实用眼科杂志》
CSCD
北大核心
2007年第3期270-273,共4页
Chinese Journal of Practical Ophthalmology
关键词
相干光生物测量法
超声生物测量法
眼球轴长
Partial Coherence Interferometry
Ultrasonic Biometry
Ocular Axial Length
