Anzeige
Erschienen in:
01.10.2013 | Ophthalmology
Light–dark changes in iris thickness and anterior chamber angle width in eyes with occludable angles
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 10/2013
Einloggen, um Zugang zu erhaltenAbstract
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.