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Light–dark changes in iris thickness and anterior chamber angle width in eyes with occludable angles

Graefe's Archive for Clinical and Experimental Ophthalmology volume 251, pages 2395–2402 (2013)Cite this article

Abstract

Backgound

The purpose of this study was to investigate and measure light–dark changes in iris thickness (IT) and anterior chamber angle width in eyes with occludable angles and open angles by using anterior segment optical coherence tomography (AS-OCT).

Methods

We examined 153 eyes of 153 Japanese patients with primary angle closure suspect, primary angle closure, primary angle closure glaucoma, or primary open angle glaucoma. AS-OCT was used to determine pupil diameter, IT, angle opening distance at 500 μm (AOD500), and trabecular-iris space area at 500 μm (TISA500) in each quadrant of the anterior chamber angle (superior, inferior, temporal, and nasal) under light and dark conditions.

Results

In the angle closure cases, IT, AOD500 and TISA500 in the dark varied significantly among the four quadrants (P < 0.05, analysis of variance). In contrast, in the open angle cases, IT, AOD500 and TISA500 in the dark did not differ significantly among the four quadrants. In the angle closure cases and the open angle cases, significant negative associations were found between IT difference [IT(light)–IT(dark)] and AOD500 difference [AOD500(light)–AOD500(dark)] (R = −0.411, P < 0.001 and R = −0.501, P = 0.001, respectively) and between IT difference and TISA500 difference [TISA500(light)–TISA500(dark)] (R = −0.475, P < 0.001 and R = −0.462, P = 0.002, respectively).

Conclusion

Our results suggest that thickening of the iris root under dark conditions is related to the mechanism of primary angle closure. It is important to analyze both the angle structure and peripheral IT in each quadrant.

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Authors and Affiliations

  1. Department of Ophthalmology, Kobe City Medical Center General Hospital, 2-1-1, Minatojima-Minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan

    Fumitaka Hirose, Masayuki Hata, Shin-ichiro Ito, Takaaki Matsuki & Yasuo Kurimoto

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  1. Fumitaka Hirose
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  2. Masayuki Hata
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  3. Shin-ichiro Ito
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  4. Takaaki Matsuki
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  5. Yasuo Kurimoto
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Correspondence to Fumitaka Hirose.

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Hirose, F., Hata, M., Ito, Si. et al. Light–dark changes in iris thickness and anterior chamber angle width in eyes with occludable angles. Graefes Arch Clin Exp Ophthalmol 251, 2395–2402 (2013). https://doi.org/10.1007/s00417-013-2378-4

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  • DOI: https://doi.org/10.1007/s00417-013-2378-4

Keywords

  • Primary angle closure
  • Glaucoma
  • Iris thickness
  • Anterior chamber angle width
  • Anterior segment optical coherence tomography