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Open Access Highly Accessed Research article

The distribution of axial length, anterior chamber depth, lens thickness, and vitreous chamber depth in an adult population of Shahroud, Iran

Hassan Hashemi12, Mehdi Khabazkhoob1, Mohammad Miraftab1, Mohammad Hassan Emamian3, Mohammad Shariati4, Tahereh Abdolahinia15 and Akbar Fotouhi6*

Author Affiliations

1 Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran

2 Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran

3 Shahroud University of Medical Sciences, Shahroud, Iran

4 Department of Community Medicine, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

5 Department of Optometry, Tehran University of Medical Sciences, Tehran, Iran

6 Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

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BMC Ophthalmology 2012, 12:50  doi:10.1186/1471-2415-12-50

Published: 18 September 2012

Abstract

Background

Ocular biometric parameters can be influenced by race, ethnicity, and genetics; their differences across different populations can probably explain differences in refractive errors in these populations. The aim of this study is to determine the normal range of axial length, anterior chamber depth, lens thickness, and vitreous chamber depth in the population of Shahroud in the north of Iran.

Methods

In the first phase of Shahroud Eye Cohort Study, the 40–64 year old population were sampled cross-sectionally; 6311 were invited and 5190 (82.2%) participated in the study. Biometric examinations were done using the LENSTAR/BioGraph (WaveLight AG, Erlangen, Germany) after vision tests and before cycloplegic refraction tests. Any type of eye surgery, extensive pterygium, and lack of cooperation were used as exclusion criteria, and analyses were done with data from 4869 eyes.

Results

We found a mean axial length of 23.14 mm (95% confidence interval [CI], 23.11-23.17), mean anterior chamber depth of 2.62 mm (95% CI, 2.60-2.63), mean lens thickness of 4.28 mm (95% CI, 4.27-4.29), and the mean vitreous chamber depth was 15.72 mm (95% CI, 15.70-15.75).

Kolmogorov-Smirnov tests showed that the distribution of axial length, anterior chamber depth, lens thickness, and vitreous chamber depth significantly differed from normal; axial length and vitreous chamber depth demonstrated a leptokurtic distribution as well.

Axial length, anterior chamber depth, and vitreous chamber depth significantly decreased with age, and lens thickness significantly increased with age (p < 0.001). All indices were significantly higher in men.

Conclusions

The distributions of axial length, vitreous chamber depth, and lens thickness are reported for the first time in an Iranian adult population. Compared to other studies, axial length was in the mid range, nonetheless, studying axial length components showed that the Iranian population had smaller anterior chamber depth and lens thickness. Age and gender were significantly associated with all indices assessed in this study.

Keywords:
Axial length- Anterior chamber depth lens thickness- Vitreous chamber depth; Normal range