Distribution of White-to-White Corneal Diameter and Anterior Chamber Depth in Chinese Myopic Patients

Guihua Xu; Guanrong Wu; Zijing Du; Shanqing Zhu; Yunxiang Guo; Honghua Yu; Yijun Hu

doi:10.3389/fmed.2021.732719

Distribution of White-to-White Corneal Diameter and Anterior Chamber Depth in Chinese Myopic Patients

Front Med (Lausanne). 2021 Nov 18:8:732719. doi: 10.3389/fmed.2021.732719. eCollection 2021.

Authors

Guihua Xu¹, Guanrong Wu², Zijing Du², Shanqing Zhu³, Yunxiang Guo³, Honghua Yu², Yijun Hu^{2

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Affiliations

¹ Department of Ophthalmology, Huizhou Municipal Central Hospital, Huizhou, China.
² Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
³ Aier Institute of Refractive Surgery, Refractive Surgery Center, Guangzhou Aier Eye Hospital, Guangzhou, China.
⁴ Aier School of Ophthalmology, Central South University, Changsha, China.

Abstract

Purpose: To investigate the distribution of white-to-white (WTW) corneal diameter and anterior chamber depth (ACD) in Chinese myopia patients. Methods: This was a cross-sectional observational study conducted at five ophthalmic centers. Anterior segment biometry was performed in 7,893 eyes of the 7,893 myopic patients using Pentacam, and the WTW and ACD were recorded. The distribution patterns of WTW and ACD were evaluated and the correlation between WTW and ACD was analyzed statistically. Results: There were 4416 (55.95%) males and 3477 (44.05%) females. The age of the study population was 25.14 ± 5.41 years. Distribution of WTW was slightly positively skewed (Skewness = 0.0076, Kurtosis = 0.3944, KS P = 0.020) with a mean of 11.65 ± 0.38 mm and a 95% normal range of 10.91-12.39 mm. A significant difference in WTW was found among different myopia groups (P < 0.001). The ACD was normally distributed (Skewness = 0.899, Kurtosis = 0.027, KS P = 0.086). The mean ACD was 3.25 ± 0.26 mm and the 95% normal range of was 2.74-3.75 mm. A significant difference in ACD was also found among different myopia groups (P = 0.030). There was a significant correlation between WTW and ACD (r = 0.460, P < 0.001). Conclusions: In our study, 95% of the Chinese myopic patients had a WTW within 10.91-12.39 mm and an ACD within 2.74-3.75 mm. ACD and WTW were significantly different among different myopia, gender and age groups. WTW was positively correlated with ACD.

Keywords: Chinese; anterior chamber depth; distribution; myopia patients; white-to-white corneal diameter.