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Kim, Kang, and Jin: Comparison of Anterior Segment Measurements between Scheimpflug Camera and New Module of Optical Coherence Tomography
Original Article

J Korean Ophthalmol Soc 2018;59(7):613-621.

Published online: 25 September 2018

DOI: https://doi.org/10.3341/jkos.2018.59.7.613

Comparison of Anterior Segment Measurements between Scheimpflug Camera and New Module of Optical Coherence Tomography

Jae Min Kim, MD, Min Seok Kang, MD, Kyung Hyun Jin, MD, PhD

Department of Ophthalmology, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, Korea

Address reprint requests to Kyung Hyun Jin, MD, PhD Department of Ophthalmology, Kyung Hee University Hospital, #23 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea Tel: 82-2-958-8460, Fax: 82-2-966-7340 E-mail: khjinmd@khmc.or.kr

Received 15 March 2018       Revised 23 April 2018       Accepted 26 June 2018

Copyright © 2018 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

We compared the anterior segment measurements using a Scheimpflug camera (Pentacam® [Oculus Inc., Wetzlar, Germany]) and a new anterior segment module of optical coherence tomography (Cirrus HD-OCT 5000® [Carl Zeiss Meditec, Dublin, CA, USA]).

Methods

Anterior segment measurements were evaluated in 47 eyes of 26 patients who visited for the purpose of cataract surgery. Measurements of the central corneal thickness (CCT), anterior chamber depth (ACD), anterior chamber angle (ACA; nasal and temporal side), and angle to angle distance (ATA) were compared between the Pentacam® and the new anterior seg-ment module of the Cirrus HD-OCT 5000®.

Results

The mean CCTs measured by the Pentacam® and the new anterior segment module of the Cirrus HD-OCT 5000® were 561.68 ± 31.35 μ m and 559.04 ± 36.43 μ m, respectively. There was no statistically significant difference (p = 0.387) and high correlations in the results using the two methods (r = 0.824, p < 0.001). The mean ACD measurements using the Pentacam® and Cirrus HD-OCT 5000® were 2.70 ± 0.44 mm and 2.68 ± 0.42 mm, respectively. The measurements were strongly correlated (r = 0.981, p < 0.001) without a statistically significant difference (p = 0.091). The measurements of ACA (nasal and temporal side) and ATA did not differ significantly different between the two methods (p = 0.109, p = 0.153, p = 0.322, respectively). High correlations were observed between the two methods (r = 0.944, r = 0.951, r = 0.955, respectively; p < 0.001 in all groups).

Conclusions

There was no significant difference between the CCT, ACD, ACA, and ATA measured by the Pentacam® and the new anterior segment module of the Cirrus HD-OCT 5000® in adult patients. However, there was a low degree of agreement for the CCT. The measurements of ACD, ACA, and ATA can therefore be considered interchangeable when used clinically.

Keywords: Anterior chamber angle, Anterior chamber depth, Central corneal thickness, Cirrus HD-OCT®, Pentacam®

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Figure 1.
Device picture. New anterior segment module that can be attached to Cirrus HD-OCT 5000® (Carl Zeiss Meditec, Dublin, CA, USA).
jkos-59-613f1.tif
Figure 2.
An example of anterior chamber mode of the Cirrus HD-OCT 5000® (Carl Zeiss Meditec, Dublin, CA, USA). Anterior chamber analysis screen with linear measurement tool of the Cirrus HD-OCT 5000®.
jkos-59-613f2.tif
Figure 3.
An example of wide angle to angle mode of the Cirrus HD-OCT 5000® (Carl Zeiss Meditec, Dublin, CA, USA). The anterior chamber angle was measured on a line per-pendicular to the trabecular meshwork at points 500 μ m from the scleral spur.
jkos-59-613f3.tif
Figure 4.
Pearson correlation of Pentacam® (Oculus Inc., Wetzlar, Germany) and Cirrus OCT® (Carl Zeiss Meditec, Dublin, CA, USA) in anterior segment parameters. (A) Central corneal thickness (CCT). (B) Anterior chamber depth (ACD). (C) Anterior chamber angle (nasal) (ACA_N). (D) Anterior chamber angle (temporal) (ACA_T). (E) Angle to angle distance (ATA).
jkos-59-613f4.tif
Figure 5.
Bland-Altman plots of Pentacam® (Oculus Inc., Wetzlar, Germany) and Cirrus OCT® (Carl Zeiss Meditec, Dublin, CA, USA) in anterior segment parameters. (A) Central corneal thickness (CCT). (B) Anterior chamber depth (ACD). (C) Anterior chamber angle (nasal) (ACA_N). (D) Anterior chamber angle (temporal) (ACA_T). (E) Angle to angle distance (ATA).
jkos-59-613f5.tif
Table 1.
Comparison of anterior segment measurements using Pentacam® and Cirrus OCT®
  Pentacam® Cirrus OCT® p-value* r
CCT (μ m) 561.68 ± 31.35 559.04 ± 36.43 3 0.387 0.824
ACD (mm) 2.70 ± 0.44 2.68 ± 0.42 0.091 0.981
ACA_N (°) 31.25 ± 7.46 30.64 ± 7.76 0.109 0.944
ACA_T (°) 32.80 ± 7.21 32.32 ± 7.18 0.153 0.951
ATA (mm) 11.58 ± 0.50 11.56 ± 0.53 0.322 0.955

Values are presented as mean ± SD unless otherwise indicated.

r = correlation coefficient; CCT = central corneal thickness; ACD = anterior chamber depth; ACA_N = anterior chamber angle (nasal); ACA_T = anterior chamber angle (temporal); ATA = angle to angle distance.

* Using a paired t-test.

Table 2.
Intercorrelation of each method for anterior segment measurements
  ICC (95% CI) (Pentacam®-Cirrus OCT®)
CCT (μ m) 0.898 (0.816–0.943)
ACD (mm) 0.990 (0.982–0.995)
ACA_N (°) 0.971 (0.947–0.984)
ACA_T (°) 0.975 (0.952–0.986)
ATA (mm) 0.976 (0.955–0.988)

ICC = intraclass correlation coefficient; CI = confidence interval; CCT = central corneal thickness; ACD = anterior chamber depth; ACA_N = anterior chamber angle (nasal); ACA_T = anterior chamber angle (temporal); ATA = angle to angle distance.

Table 3.
Intraexaminer repeatability of each method for ante rior segment measurements
  ICC (95% CI)
Pentacam® Cirrus OCT®
CCT (μ m) 0.899 (0.821–0.942) 0.910 (0.892–0.931)
ACD (mm) 0.950 (0.921–0.970) 0.903 (0.824–0.946)
ACA_N (°) 0.970 (0.930–0.988) 0.962 (0.932–0.979)
ACA_T (°) 0.965 (0.941–0.980) 0.924 (0.865–0.952)
ATA (mm) 0.908 (0.889–0.927) 0.986 (0.967–0.992)

ICC = intraclass correlation coefficient; CI = confidence interval; CCT = central corneal thickness; ACD = anterior chamber depth; ACA_N = anterior chamber angle (nasal); ACA_T = anterior chamber angle (temporal); ATA = angle to angle distance.

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