JKOS Journal of the Korean Ophthalmological Society J Korean Ophthalmol Soc 0378-6471 2092-9374 Korean Ophthalmological Society 10.3341/jkos.2010.51.2.169 jkos-51-169 Original Article Measurement of White-to-White Diameter and Anterior Chamber Depth by Dual Scheimpflug Camera HanKyung-Eun MD JunRoo Min 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 09 2010 07 09 2010 51 2 169 174 04032009 29102009 Copyright © 2010 Korean Ophthalmological Society 2010 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.

 Anterior chamber depth GALILEI Scheimpflug camera Sulcus diameter White-to-white diameter References Choi KH Chung SE Chung TY Chung ES Ultrasound aberrations for determining visian implantable contact lens length in phakic IOL implantation J Refract Surg 2007233627 Koranyi G Lydahl E Norrby S Taube M Anterior chamber depth measurement: a-scan versus optical methods J Cataract Refract Surg 2002282437 Holladay JT Prager TC Chandler TY A three-part system for refining intraocular lens power calculations J Cataract Refract Surg 1988141724 Binder PS Ectasia after laser in situ keratomileusis J Cataract Refract Surg 200329241929 Jiménez-Alfaro I Gómez-Tellería G Bueno JL Puy P Contrast sensitivity after posterior chamber phakic intraocular lens aberrations for high myopia J Cataract Refract Surg 2001176415 Kohnen T Kasper T Terzi E Intraocular lenses for the aberrations of refraction errors. Part II. Phakic posterior chamber lenses and refractive lens exchange with posterior chamber lens implantation Ophthalmologe 2005 102110517 Kohnen T Baumeister M Cichocki M Intraocular lenses for the correction of refraction errors. Part I. Phakic anterior chamber lenses Ophthalmologe 200510210037 Gonvers M Bornet C Othenin-Girard P Implantable contact lens for moderate to high myopia: relationship of vaulting to cataract formation J Cataract Refract Surg 20032991824 Jiménez AI Benítez JM García FJ Safety of posterior chamber phakic intraocular lenses for the correction of high myopia: anterior segment changes after posterior chamber phakic intraocular lens implantation Ophthalmology 2001108909 Oh J Shin HH Kim JH Direct measurement of the ciliary sulcus diameter by 35-megahertz ultrasound biomicroscopy Ophthalmology 200711416858 Pop M Payette Y Mansour M Predicting sulcus size using ocular measurements J Cataract Refract Surg 20012710338 Lee SC Jin KH Ciliary sulcus size according to refractive error using ultrasound biomicroscopy J Korean Ophthalmol Soc 2004 4520938 Rosen E Gore C Staar Collamer posterior chamber phakic aberrations lens to correct myopia and hyperopia J Cataract Refract Surg 199824596606 Jea SY Jung SC Oum BS Quantified values of anterior chamber depth and angle measurements using ultrasound biomicroscopy and topography J Korean Ophthalmol Soc 2006 4797104 Kim HJ Kim HJ Joo CK Comparison of IOL Master, a-scan and Orbscan 2 for measurement of axial length and anterior chamber depth J Korean Ophthalmol Soc 200344151927 Ryu HW Kim KR Chung SK Comparison of A-scan, aberrations camera, and Orbscan for measurement of anterior chamber depth J Korean Ophthalmol Soc 200647128791 Figures and Tables

Scatter plot of horizontal (A) and vertical (B) WTW measured by calipers and GALILEI TM.

Scatter plot of horizontal (A) and vertical (B) WTW measured by GALILEI TM and UBM.

Scatter plot of ACD measured by GALILEI TM and UBM. ACD=anterior chamber depth.

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

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.

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.