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Han and Jun: Measurement of White-to-White Diameter and Anterior Chamber Depth by Dual Scheimpflug Camera
Original Article

J Korean Ophthalmol Soc 2010;51(2):169-174.

Published online: 7 September 2010

DOI: https://doi.org/10.3341/jkos.2010.51.2.169

Measurement of White-to-White Diameter and Anterior Chamber Depth by Dual Scheimpflug Camera

Kyung-Eun Han, MD, Roo Min Jun, MD, PhD

Department of Ophthalmology, Ewha Womans University School of Medicine, Seoul, Korea

Address reprint requests to Roo Min Jun, MD Department of Ophthalmology, Ewha Womans University School of Medicine, Mok-dong Hospital #911-1 Mok-dong, Yangcheon-gu, Seoul 158-710, Korea Tel: 82-2-2650-5154, Fax: 82-2-2654-4334, E-mail: jrmoph@ewha.ac.kr

Received 4 March 2009       Accepted 29 October 2009

Copyright © 2010 Korean Ophthalmological Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To estimate the horizontal and vertical white-to-white diameters (WTW) and anterior chamber depths (ACD) with a dual Scheimpflug camera (GALILEI™, Ziemer, Switzerland) and to compare the estimates measured by a measuring caliper and ultrasound biomicroscopy (UBM PlusTM, Paradigm Inc., Utah, USA) in normal subjects.

Methods

Forty-four eyes of 23 subjects were evaluated. Corneal diameter as measured by GALILEI was directly compared with the white-to-white diameter (WTW) measured by a caliper and the correlation with ciliary sulcus diameter (STS) by UBM was evaluated. The anterior chamber depth (ACD) as measured by GALILEI™ was compared with the estimates measured by UBM.

Results

The horizontal and vertical diameters of WTW by GALILEI were not significantly different from the measurements taken by calipers (p>0.05, p>0.05, respectively), and there were no correlations between the measurements (r=-0.074, p>0.05 at 180 o r=0.297, p>0.05 at 90 o, respectively). The estimates by GALILEI did not correlate with those measured with UBM (r=-0.006, p>0.05 at 180 o r=-0.222, p>0.05 at 90 o, respectively). However, the mean ACD by GALILEI was deeper than thatby UBM (p<0.01), and the measurements correlated strongly with each other (r=0.760; p<0.01).

Conclusions

The mean WTW measured by GALILEI was not significantly different from the measurements taken by calipers and the measurements did not correlate with each other. There was also no correlation with the measurementsby GALILEI and UBM. ACD by GALILEI was measured to be deeper those that by UBM.

Keywords: Anterior chamber depth, GALILEI, Scheimpflug camera, Sulcus diameter, White-to-white diameter

References

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Figure 1.
Scatter plot of horizontal (A) and vertical (B) WTW measured by calipers and GALILEI TM.
jkos-51-169f1.tif
Figure 2.
Scatter plot of horizontal (A) and vertical (B) WTW measured by GALILEI TM and UBM.
jkos-51-169f2.tif
Figure 3.
Scatter plot of ACD measured by GALILEI TM and UBM. ACD=anterior chamber depth.
jkos-51-169f3.tif
Table 1.
Demographics of patients (Mean± SD)
Characteristics Values
No. of patients (eyes) 23 (44)
Sex (M:F) 4:19
Ages (years) 30.2±7.44
Spherical equivalent (diopter) −2.74±1.94
Table 2.
Comparison of estimates by calipers, GALILEI TM and UBM (Mean± SD)
Caliper (WTW†) GALILEI (WTW) UBM (STS‡) p-value*
Horizontal (mm) 11.6±0.50 11.3±1.18 11.0±0.89 0.111
Vertical (mm) 11.2±0.51 11.5±1.10 11.1±0.92 0.138

* Paired t-test in caliper and GALILEI

† WTW=white-to-white diameter

‡ STS=ciliary sulcus diameter.

Table 3.
Comparison of the anterior chamber depth (ACD) by GALILEI TM and UBM (Mean± SD)
Measurement GALILEI UBM p-value*
ACD (mm) 3.1 ±0.29 2.9 ± 0.28 <0.01

* Paired t-test.

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