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. 2021 Sep 23:8:688805.
doi: 10.3389/fmed.2021.688805. eCollection 2021.

Distribution of Ocular Anterior and Posterior Segment Lengths Among a Cataract Surgical Population in Shanghai

Jiao Qi  1   2   3   4   5 , Wenwen He  1   2   3   4   5 , Jiaqi Meng  1   2   3   4   5 , Ling Wei  1   2   3   4   5 , Dongjin Qian  1   2   3   4   5 , Yi Lu  1   2   3   4   5 , Xiangjia Zhu  1   2   3   4   5
Affiliations

Distribution of Ocular Anterior and Posterior Segment Lengths Among a Cataract Surgical Population in Shanghai

Jiao Qi et al. Front Med (Lausanne). .

Abstract

Purpose: To investigate the distributions of the ocular anterior and posterior segment lengths among a cataract surgical population in Shanghai. Design: Cross-sectional study. Methods: Ocular biometric parameters of 23,462 eyes of 23,462 cataract surgery candidates were reviewed. Axial length (AL), anterior chamber depth (ACD), and lens thickness (LT) were obtained using IOL Master. Anterior segment length (ASL = ACD + LT), posterior segment length (PSL = AL - ASL) and the ratio of ASL to PSL (ASL/PSL) were calculated. Results: The mean ASL was 7.58 ± 0.39 mm, the mean PSL was 17.12 ± 2.64 mm. As the age grew, the ASL increased, and PSL increased firstly then decreased. Male subjects tended to have significantly longer ASL and shorter PSL than female subjects. With the increasing AL, the ASL was firstly decreased to trough at 20-22 mm AL group, then increased gradually, while the PSL increased rapidly. The ASL correlated positively with AL in normal, moderate and highly myopic eyes, negatively in short eyes. The PSL correlated positively with AL across the entire study population. The ASL/PSL was not constant in the eyes with different AL but had a relatively steep downward trend with the increasing AL in the short eyes, then decreased smoothly in normal, moderate and highly myopic eyes. Conclusions: In Chinese cataractous eyes, longer ASL and shorter PSL were associated with elder age and male gender. The change of ASL over AL was not linear, and the ASL was smallest in the eyes with AL of 20-22 mm. The elongation of the eyeball was mainly due to the extension of the posterior segment.

Keywords: IOL Master 700; anterior segment length; axial length; cataract patients; posterior segment length.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Distribution of anterior and posterior segment lengths in this study population. (A) The distribution of anterior segment length (ASL) was positively skewed and peaked. (B) The distribution of posterior segment length (PSL) was positively skewed and peaked.
Figure 2
Figure 2
Comparisons of anterior and posterior segment lengths stratified by age and sex. (A) The anterior segment length (ASL) was increasing gradually both in either male or female subjects, and that of male subjects was significantly larger than that of female subjects among all age groups. (B) The posterior segment length (PSL) of male and female subjects both increased as the age grew from 30 to 49, then decreased with the increase of age, and male subjects had significantly longer PSL than female subjects in elder than 50 population. *Comparisons between male and female subjects, p < 0.05.
Figure 3
Figure 3
Changes of anterior and posterior segment lengths with axial length (AL). (A) With the increase of AL, the anterior segment length (ASL) was firstly decreased to trough in the group with AL of 20–22 mm, then increased gradually. (B) With the increasing AL, the posterior segment length (PSL) was always on the rise.
Figure 4
Figure 4
Correlations of anterior and posterior segment lengths with axial length (AL). (A) The anterior segment length (ASL) positively correlated with AL in the normal and myopic eyes, negatively in the short AL eyes. (B) The posterior segment length (PSL) positively correlated with AL in the whole population. (C) The ratio of ASL to PSL (ASL/PSL) had a relatively steep downward trend with the increasing AL in the short eyes, then decreased smoothly in normal, moderate and highly myopic eyes.
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