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J. Qu, H. Sasaki, Y. Kawakami, Y. Sakamoto, M. Kojima, J. Zhou, K. Wu, J. Zhang, R. Honda, K. Sasaki; The Relationship of Axial Length and Three Main Types of Cataract in the Population of a Tropical Area of China. Invest. Ophthalmol. Vis. Sci. 2007;48(13):5452.
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© ARVO (1962-2015); The Authors (2016-present)
To describe the relationship between axial length and prevalence of the three main types of cataract in the population of a tropical area of China.
Some 558 participants aged ≥50yrs (mean:61.0±10.7yrs) from Miaolin village in Southern China (lat.18°) were examined in a Japanese/Chinese cooperative eye study, March 2006. Axial lengths of eyes were measured with an A-scan ultrasound device (US800, NIDEK) and crystalline lens were graded under maximal pupil dilation from slit lamp and retroillumination images (EAS-1000, NIDEK) by a single observer following the WHO grading system. After excluding eyes with aphakia, pseudophakia or serious corneal opacity, 1023 eyes were enrolled. Associations between axial length and cataract were assessed using the multivariate logistic regression model controlling for age and sex. Based on the mean axial length (23.1±1.2mm), cases were divided into 3 groups: Short,<23mm, axial group (SA); medium,23 to 26mm, axial group (MA), and long >26mm, axial group (LA).
Prevalence of nuclear, cortical and posterior subcapsular cataract (PSC) was 46.7%, 28.6% and 16.3%, respectively. Prevalences of nuclear cataract (84.2%) and PSC (35.3%) in LA group were significantly higher than in the other two groups . Increased risk of nuclear cataract and PSC at grade 1 and over was found in LA compared with SA with odds ratio of 6.12 (95%CI 2.03~18.43) in nuclear and 3.27 (95%CI 1.23~8.69) in PSC.
The population in this tropical area of China had a high prevalence of cataract. Even in a population with a high prevalence of nuclear cataract, eyes with long axial length were at higher risk of nuclear cataract and PSC, however, axial length did not seem to be related to the prevalence of cortical catarac.
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