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Background: To determine how many measurements should be evaluated to determine the iris bow and evaluate changes of iris bow at 12 clock positions after LPI in primary angle closure eyes.

Methods: A total of 93 primary angle closure eyes in 93 Chinese patients were enrolled. Anterior iris bowing was evaluated at 12 clock positions and 4 clock positions (3, 6, 9, and 12 o'clock) before, 1 week and 3 months after LPI using swept source optical coherence tomography.

Results: At baseline, almost all of the eyes exhibited an iris bow when measured using 12 clock positions, consistent with results obtained from measurements at 4 clock positions (Cronbach's alpha = 0.99). LPI caused a relative unified change in all of the clock positions (Cronbach's alpha = 0.91) except the LPI site. After LPI, there was no significant difference between 12 and 4 clock position measurements for the iris bow (both p > 0.05), with ~34.1% vs. 33% of the patients remained iris bow at 1 week and 34% vs. 31.9% of the patients remained iris bow at 3 months. However, the coexisting iris bow configuration was more common when measured using 4 clock positions (16.5% vs. 3.3% at 1 week and 25.5% vs. 10.6% at 3 months).

Conclusions: There was excellent consistency when measuring the iris bow at 4 or 12 clock positions. LPI caused a relatively unified iris bow change at 12 clock positions, and a single LPI relieved only ~2/3 of the iris bow configurations.

Titel:	Clock position-based iris bow configuration after laser peripheral iridotomy in Chinese angle closure eyes: a swept source optical coherence tomography study.
Autor/in / Beteiligte Person:	Chen, S ; Liu, Y ; Li, F ; Gao, K ; Zhou, R ; Zhang, X
Link:	View record at Springer (Volltext)
Zeitschrift:	Eye (London, England), Jg. 34 (2020-05-01), Heft 5, S. 873-879
Veröffentlichung:	<2003->: London : Nature Publishing Group ; <i>Original Publication</i>: [London : Ophthalmological Society of the United Kingdom, 1987-, 2020
Medientyp:	academicJournal
ISSN:	1476-5454 (electronic)
DOI:	10.1038/s41433-019-0601-1
Schlagwort:	China Gonioscopy Humans Intraocular Pressure Iridectomy Iris diagnostic imaging Iris surgery Lasers Prospective Studies Tomography, Optical Coherence Glaucoma, Angle-Closure surgery Laser Therapy
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article; Research Support, Non-U.S. Gov't Language: English [Eye (Lond)] 2020 May; Vol. 34 (5), pp. 873-879. <i>Date of Electronic Publication: </i>2019 Sep 25. MeSH Terms: Glaucoma, Angle-Closure* / surgery ; Laser Therapy* ; China ; Gonioscopy ; Humans ; Intraocular Pressure ; Iridectomy ; Iris / diagnostic imaging ; Iris / surgery ; Lasers ; Prospective Studies ; Tomography, Optical Coherence References: Henzan IM, Tomidokoro A, Uejo C, Sakai H, Sawaguchi S, Iwase A, et al. Comparison of ultrasound biomicroscopic configurations among primary angle closure, its suspects, and nonoccludable angles: the Kumejima Study. Am J Ophthalmol. 2011;151:1065–.e1. (PMID: 10.1016/j.ajo.2010.11.030) ; Radhakrishnan S, Goldsmith J, Huang D, Westphal V, Dueker DK, Rollins AM, et al. Comparison of optical coherence tomography and ultrasound biomicroscopy for detection of narrow anterior chamber angles. 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Comparison of new visual disturbances after superior versus nasal/temporal laser peripheral iridotomy: a prospective randomized trial. Ophthalmology. 2018;125:345–51. (PMID: 10.1016/j.ophtha.2017.09.015) Entry Date(s): Date Created: 20190927 Date Completed: 20210618 Latest Revision: 20210618 Update Code: 20231215 PubMed Central ID: PMC7182565

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Clock position-based iris bow configuration after laser peripheral iridotomy in Chinese angle closure eyes: a swept source optical coherence tomography study.