Changes in Caucasian eyes after laser peripheral iridotomy: an anterior segment optical coherence tomography study
Article first published online: 3 NOV 2010
© 2010 The Authors. Clinical and Experimental Ophthalmology © 2010 Royal Australian and New Zealand College of Ophthalmologists
Clinical & Experimental Ophthalmology
Volume 38, Issue 8, pages 778–785, November 2010
How to Cite
Ang, G. S. and Wells, A. P. (2010), Changes in Caucasian eyes after laser peripheral iridotomy: an anterior segment optical coherence tomography study. Clinical & Experimental Ophthalmology, 38: 778–785. doi: 10.1111/j.1442-9071.2010.02360.x
- Issue published online: 3 NOV 2010
- Article first published online: 3 NOV 2010
- Received 30 March 2010; accepted 14 May 2010.
- angle closure;
- anterior segment optical coherence tomography;
- laser peripheral iridotomy
Background: To evaluate by anterior segment optical coherence tomography (AS-OCT) the changes in the anterior chamber structures in Caucasian eyes after laser peripheral iridotomy (PI).
Methods: Retrospective study of consecutive Caucasian primary angle closure suspect (PACS), primary angle closure (PAC) or primary angle closure glaucoma (PACG) patients who underwent laser PI over a 25-month period at a specialist glaucoma practice. The AS-OCT images of the temporal and nasal angles (in light and dark) before and after laser PI were analysed. The parameters studied were trabecular-iris angle (TIA), angle opening distance (AOD), trabecular-iris space area (TISA), trabecular-iris contact length (TICL), iris thickness (IT) and maximum iris bow height (MIBH).
Results: Images of 71 eyes of 71 patients were assessed. The mean age at laser PI was 60.3 ± 10.0 years. Forty (56.3%) were women, and 14 (19.7%) had PACG. The mean time from laser PI to the follow-up AS-OCT scan was 5.92 ± 3.22 weeks. The IT did not alter significantly after laser PI, but there were significant increases in the TIA, AOD and TISA, as well as a significant decrease in MIBH, in both light and dark. There was no difference in the magnitude of change seen between the temporal and nasal angles, or between PACS/PAC and PACG eyes.
Conclusion: In Caucasian eyes, laser PI resulted in significant angle widening (increased TIA, AOD and TISA) and iris profile flattening (decreased MIBH) at the temporal and nasal angles based on AS-OCT imaging in both light and dark.