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Open Access Research article

Relative lens vault in subjects with angle closure

Young Kook Kim1, Beong Wook Yoo2, Hee Chan Kim3, Tin Aung4 and Ki Ho Park56*

Author Affiliations

1 Department of Ophthalmology, Jeju National University Hospital, Jeju, Korea

2 Bioengineering Major, Graduate School, Seoul National University, Seoul, Korea

3 Department of Biomedical Engineering, College of Medicine and Institute of Medical and Biological Engineering, Medical Research Center, Seoul National University, Seoul, Korea

4 Department of Ophthalmology, Singapore National Eye Center, Singapore, Singapore

5 Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea

6 Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea

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BMC Ophthalmology 2014, 14:93  doi:10.1186/1471-2415-14-93

Published: 21 July 2014

Abstract

Background

The purpose of this study was to investigate the association of a novel biometric parameter, relative lens vault (LV), with primary angle-closure (PAC) and primary angle-closure glaucoma (PACG).

Methods

We evaluated 101 subjects with PAC (G) and 101 normal subjects that were age- and gender-matched. Based on anterior-segment optical coherence tomography scans, and using customized software, the anterior vault (AV) and LV were measured. They were defined as the maximum distances between the horizontal line connecting the two scleral spurs and the posterior corneal surface and anterior lens surface, respectively. The relative LV was calculated by dividing the LV by the AV.

Results

Significant differences between PAC (G) eyes and normal eyes were found in the LV (1.06 ± 0.41 vs. 0.36 ± 0.37 mm, P < 0.001), relative LV (0.34 ± 0.23 vs. 0.11 ± 0.25, P < 0.001), and axial length (22.96 ± 0.94 vs. 24.02 ± 1.33 mm, P < 0.001). However, the two groups’ values of the AV relative to those of axial length were quite similar (both 0.14 ± 0.03, P = 0.91). The relative LV values distinguished between PAC (G) eyes and normal eyes better than the LV values (area under the receiver operator characteristic curve: 0.97 vs. 0.92, P = 0.032).

Conclusions

Our results suggest that relative dimensions of the eyeball’s anterior portion in PAC (G) eyes might be within the normal range. And the value of LV relative to that of the AV (i.e., the relative LV) is more closely related to PAC (G) than is the absolute value of LV.