Anterior Chamber and Lens Position before and after Phacoemulsification According to Axial Length

Suk Hoon Jung; Seonjoo Kim; So Hyang Chung

doi:10.3341/jkos.2020.61.1.17

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Jung, Kim, and Chung: Anterior Chamber and Lens Position before and after Phacoemulsification According to Axial Length

Original Article

Journal of the Korean Ophthalmological Society 2020; 61(1): 17-26.

Published online: 15 January 2020

DOI: https://doi.org/10.3341/jkos.2020.61.1.17

Anterior Chamber and Lens Position before and after Phacoemulsification According to Axial Length

Suk Hoon Jung, MD, Seonjoo Kim, MD, So Hyang Chung, MD, PhD

Department of Ophthalmology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.

Address reprint requests to So Hyang Chung, MD, PhD. Department of Ophthalmology, Seoul St. Mary's Hospital, #222 Banpo-daero, Seocho-gu, Seoul 06591, Korea. Tel: 82-2-2258-6203, Fax: 82-2-599-7405, chungsh@catholic.ac.kr

Received 20 June 2019 Revised 19 July 2019 Accepted 30 December 2019

The Korean Ophthalmological Society

(open-access):

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

In this study, we evaluated changes in the anterior chamber structure and lens position before and after phacoemulsification in eyes grouped by axial length (AL).

Methods

This study included 65 eyes (16 short eyes [AL < 22.5 mm], 33 normal eyes [22.5 mm < AL < 25.0 mm], and 16 long eyes [AL > 25.5 mm]) that underwent cataract surgery. Pre- and postoperative anterior chamber depth (ACD) was measured using Pentacam® and IOL Master®,. In addition, we evaluated the anterior chamber angle (ACA), anterior chamber volume (ACV), epithelium-iris distance, and iris-lens (intraocular lens [IOL]) distance.

Results

The change in ACD was significantly smaller in long eyes (Pentacam®,, p = 0.000; IOL Master®,, p = 0.001). The change in ACA was significantly larger in short eyes (p = 0.000), and the change in ACV was significantly smaller in long eyes (p = 0.000). The change in the epithelium–iris distance was significantly smaller in long eyes (p = 0.000), and the change in the iris-lens (IOL) distance was significantly smaller in short eyes (p = 0.000).

Conclusions

In short eyes, changes in ACD, ACA, and ACV were found to be larger than those of other groups as the iris moved backward. In long eyes, greater backward movement of the IOL was observed. Therefore, the appropriate IOL power should be chosen, considering the postoperative position of the IOL during cataract surgery of short and long eyes.

Keywords: Anterior chamber depth, Axial length, Intraocular lens, Long, Short

Figures and Tables

Figure 1

Parameters measured with the Scheimpflug images of Pentacam®,. (A) Anterior chamber depth (red line), distance from the anterior surface of the iris to the anterior surface of the crystalline lens (yellow line). (B) Distance from the anterior surface of the iris to the anterior surface of the intraocular lens (green line).

Figure 2

Associations between axial length and difference of anterior chamber parameters (ACD-Pentacam®, [A], ACD-IOL Master®, [B], ACA [C], ACV [D], Epithelium-Iris distance [E] and iris-lens [IOL] distance [F]). ACD = anterior chamber depth; ACA = anterior chamber angle; ACV = anterior chamber volume; IOL = intraocular lens. Statistically significant p-value <0.01 using Pearson's correlation analysis.

Figure 3

Changes in anteror segment before and after phacoemulsification in a short and a long eye, measured with Scheimpflug images of Pentacam®,. Change in anteror segment of a short eye (axial length [AL] 21.23), before phacoemulsification (A) and after phacoemulsificaion (B), change in anteror segment of a long eye (AL 27.34) before phacoemulsification (C) and after phacoemulsificaion (D).

Table 1

Preoperative baseline charateristics of patients in the three groups

Values are presented as mean ± standard deviation or number.

ACD = anterior chamber depth.

^*Statistically significant using Mann-Whitney U test with Bonferroni's correction (p < 0.017).

Table 2

Changes in anterior chamber depth in the three groups

Values are presented as mean ± standard deviation.

ACD = anterior chamber depth.

^*Statistically significant using Mann-Whitney U test with Bonferroni's correction (p < 0.017).

Table 3

Comparison of anterior chamber depth and its difference between Pentacam®, and IOL Master®,

Values are presented as mean ± standard deviation.

ACD = anterior chamber depth.

^*Statistically significant using paired t-test (p < 0.05).

Table 4

Changes in anterior chamber angle and volume in the three groups

Values are presented as mean ± standard deviation.

AC = anterior chamber.

^*Statistically significant using Mann-Whitney U test with Bonferroni's correction (p < 0.017).

Table 5

Changes in epithelium-iris distance (mm) & iris-lens (IOL) distance (mm) in the three groups

Values are presented as mean ± standard deviation.

IOL = intraocular lens.

^*Statistically significant using Wilcoxon signed rank test (p < 0.05); ^†statistically significant using Mann-Whitney U test with Bonferroni's correction (p < 0.017).

Notes

^{Conflicts of Interest} The authors have no conflicts to disclose.

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