Variations in ocular biometry in an adult Tibetan population of Lhasa

Authors: Liu Jiang,  Ci Ren Qiong Da,  Wu Yuan,  Xiao Da Wa,  Shao Yingfeng

DOI: 10.3760/cma.j.cn115989-20210114-00035
Published 2021-04-10
Cite asChin J Exp Ophthalmol, 2021, 39(4): 337-340.

Abstract

Objective

To investigate the variations in ocular biometry and its influencing factors in adult Tibetans of Lhasa.

Methods

A cross-sectional study was adopted.A total of 100 consecutive adult Tibetans (100 eyes) with cataract, who were treated in Tibet Autonomous Region People’s Hospital from March 2017 to July 2017 were enrolled, including 51 males and 49 females, with an average age of (63.38±12.80) years.The subjects were divided into two groups, with 57 subjects (57 eyes) older than 60 years in the elder group and 43 subjects (43 eyes) younger than 60 years in the youth group.Corneal curvature, corneal astigmatism, anterior chamber depth and axial length of subjects were measured and compared with those of Beijing population which were used as standardized data of Han Chinese.The differences in ocular parameters associated with age and gender were analyzed.This study adhered to the Declaration of Helsinki.The study protocol was approved by an Ethics Committee of Tibet Autonomous Region People’s Hospital (No.ME-TBHP-21-KJ-005).Written informed consent was obtained from each subject prior to any examination.

Results

The mean corneal curvature, corneal astigmatism, anterior chamber depth and axial length of the 100 Tibetans were (43.68±1.62)D, 0.750 (0.375, 1.000)D, (3.05±0.41)mm, (23.07±0.86)mm, respectively.The axial length of Tibetan was shorter than that of Beijing Han people and the difference was significant (t=2.65, P<0.01).Corneal astigmatism of the elder group was higher than that of youth group and the difference was significant (t=2.11, P<0.05).There were no significant differences in corneal curvature, anterior chamber depth and axial length between the elder group and youth group (all at P>0.05).The anterior chamber depth and axial length of males were much longer than those of females, and the differences were significant (t=2.71, 2.25; both at P<0.05).

Conclusions

In adult Tibetan population, the axial length is short, and the anterior chamber is deep.The corneal astigmatism increases with age and there is a gender difference in axial length and anterior chamber depth.

Key words:

Ocular biometry; Axial length; Tibetan

Contributor Information

Liu Jiang
Department of Ophthalmology, Tibet Autonomous Region People’s Hospital, Lhasa 850000, China
Ci Ren Qiong Da
Department of Ophthalmology, Tibet Autonomous Region People’s Hospital, Lhasa 850000, China
Wu Yuan
Department of Ophthalmology, Peking University First Hospital, Beijing 100034, China
Xiao Da Wa
Department of Ophthalmology, Tibet Autonomous Region People’s Hospital, Lhasa 850000, China
Shao Yingfeng
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Department of Ophthalmology, Peking University First Hospital, Beijing 100034, China
Xiao Da Wa
Department of Ophthalmology, Tibet Autonomous Region People’s Hospital, Lhasa 850000, China
Shao Yingfeng
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
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