ストウ　チカコ   Sutou Chikako   須藤　史子    所属   医学部 医学科（附属足立医療センター）    職種   教授
論文種別	原著
言語種別	英語
査読の有無	査読なし
表題	Influence of the signal-to-noise ratio on the accuracy of IOLMaster measurements.
掲載誌名	正式名：Journal of cataract and refractive surgery 略　 称：J Cataract Refract Surg ISSNコード：08863350/08863350
巻・号・頁	33(12),pp.2062-2066
著者・共著者	Suto Chikako†, Sato Chiaki, Shimamura Emiko, Toshida Hiroshi, Ichikawa Kazuo, Hori Sadao
担当区分	筆頭著者
発行年月	2007/12
概要	PURPOSE:To evaluate the relationship between the sound-to-noise ratio (SNR) and the reliability of axial length (AL) measurements obtained with the IOLMaster (Carl Zeiss Meditec AG).SETTING:Department of Ophthalmology, Saiseikai Kurihashi Hospital, Saitama, Japan.METHODS:In a clinical prospective study, 216 consecutive eyes of 144 patients scheduled for cataract surgery were evaluated for the type and severity of cataract using the Lens Opacities Classification System III. Preoperative and postoperative AL measurements were performed with the IOLMaster. The preoperative SNR values were used to divide the eyes into 5 groups. The following were compared between the groups: preoperative logMAR best spectacle-corrected visual acuity (BSCVA), difference in AL between preoperatively and postoperatively, error in the postoperative predicted refraction, and type and severity of cataract.RESULTS:The preoperative logMAR BSCVA was significantly worse in eyes with an SNR <2 (P<.05). The AL was longer preoperatively than postoperatively in all groups, and there was a significant difference in the <2 SNR group and the 2 to <5 group (P<.05). There were no significant differences in the error in postoperative predicted refraction. The percentage of patients with P4 or worse posterior subcapsular cataract (PSC) increased significantly with a decrease in the SNR (P<.01). However, there was no correlation between nuclear color grade and the SNR.CONCLUSION:The SNR value was useful in confirming the good quality of AL readings taken with the IOLMaster, even though the SNR value correlated significantly with the preoperative logMAR BSCVA and PSC severity.
DOI	10.1016/j.jcrs.2007.07.031
PMID	18053905