title: Refractive Results Using a New Optical Biometry Device: Comparison With Ultrasound Biometry Data.
abstract: The aim of the study was to compare the measurements of optical (AL-Scan; Nidek Co., Ltd.) and ultrasonic (Echo Scan US-800; Nidek Co., Ltd.) biometry devices and to assess refractive results after cataract surgery. Eighty-one cataractous eyes of 81 patients were included in this study. Biometry was performed using the AL-Scan and an ultrasonic biometer (USB). Axial length (AL), keratometry (K) data, and intraocular lens (IOL) power calculations using the SRK/T formula were compared. Bland-Altman analysis was used to assess the extent of agreement between AL-Scan and USB data in terms of AL measurement and IOL power calculation. The K measurements of the AL-Scan were compared to autorefractor data (Canon Autorefractor RK-F1). The AL-Scan assessed the AL as longer (average difference 0.06 ± 0.18 mm; ICC = 0.987; P < 0.001) and the IOL power as greater (average difference 0.19 ± 0.66 D; ICC = 0.964; P < 0.001) than the USB. The AL-Scan also measured average K values (average difference 0.25 ± 0.25 D; ICC = 0.985; P < 0.001) greater than those given by the autorefractor. The postoperative mean absolute error was +0.30 ± 0.04 D (minimum: -0.51 D, maximum +1.04 D). The postoperative mean K value change was 0.36 ± 0.29 D (P < 0.05). The differences between measurements afforded by the AL-Scan and USB may be clinically acceptable. Keratometric changes that develop after cataract operations compromise the attainment of good refractive outcomes.
authors.affiliation: From the Department of Ophthalmology, Faculty of Medicine, Dumlupınar University (SA, MT, HMS, FÖ), and Clinic of Ophthalmology, DPU Evliya Celebi Training and Research Hospital, Kutahya, Turkey (HA).
authors.forename: Serdar
authors.initials: S
authors.lastname: Aktas
authors.forename: Hatice
authors.initials: H
authors.lastname: Aktas
authors.forename: Mehmet
authors.initials: M
authors.lastname: Tetikoglu
authors.forename: Hac Murat
authors.initials: HM
authors.lastname: Sagdk
authors.forename: Fatih
authors.initials: F
authors.lastname: Özcura
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001699:Biometry / Q000295:instrumentation*; D002386:Cataract / Q000000981:diagnostic imaging* / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014463:Ultrasonography