J Korean Ophthalmol Soc.  2016 May;57(5):757-762. 10.3341/jkos.2016.57.5.757.

Comparison of Ocular Biometry Measurements Using A-Scan Ultrasound and Two Types of Partial Coherence Interferometers

• Ha DY
• Lee KW
• Jung JW

• KMID: 2212718
• DOI: http://doi.org/10.3341/jkos.2016.57.5.757

Abstract

PURPOSE
To compare the measurement results of 3 ocular biometry devices, A-scan ultrasound and two types of partial coherence interferometers in normal and cataractous eyes.
METHODS
This study included 42 normal eyes and 40 cataractous eye. Axial length and anterior chamber were measured using three ocular biometry measurements, ultrasonography (HiScan®, Optikon 2000, Rome, Italy), IOL Master® (Carl Zeiss, Jena, Germany), and AL-scan® (Nidek, Gamagori, Japan), and mean corneal curvature and corneal diameter were measured using two partial coherence interferometers. The results were compared in each group.
RESULTS
Significant differences in measurements existed among the 3 ocular biometry devices (A-scan ultrasound, IOL Master® and AL-scan®) in normal eyes (p < 0.001) and cataractous eyes (p = 0.034). However, the measurements were not significantly different between the 2 partial coherence interferometers (IOL Master® and AL-scan®) in both groups. We confirmed lower agreement among the 3 ocular biometry devices in cataractous eyes compared with normal eyes in terms of a larger range of 95% agreement and error in cataractous eyes.
CONCLUSIONS
Significant differences in measurements were observed when using the 3 ocular biometry devices in both normal and cataractous eyes. Because of low agreements between ocular biometry devices in cataractous eyes, complementing the measurements between ocular biometry devices is necessary when measuring cataractous eyes.

Keyword

AL-scan®; Axial length; Biometry; IOL Master®; Partial coherence interferometers

MeSH Terms

Anterior Chamber
Biometry*
Cataract
Complement System Proteins
Ultrasonography*
Complement System Proteins

Figure

• 

  Figure 1. Bland-Altman plots of axial length (mm) showing the agreement among the three devices in normal and cataractous eyes. (A) IOL Master® and A-scan in normal eyes. (B) AL scan and A-scan in normal eyes. (C) IOL Master® and AL scan in normal eyes. (D) IOL Master® and A-scan in cataractous eyes. (E) AL scan and A-scan in cataractous eyes. (F) IOL Master® and AL scan in cataractous eyes showing the 95% limits of agreement for axial length difference: -0.19 ~ 0.20 mm, -0.19 ~ 0.20 mm, -0.04 ~ 0.04 mm, -0.40 ~ 0.43 mm, -0.45 ~ 0.49 mm and -0.24 ~ 0.23 mm, respectively.

Reference

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