Original ArticleLimbus-insertion distance of superior rectus in primary angle closure glaucoma: an anterior segment OCT study
Section snippets
Subject Recruitment
All participants received a detailed explanation about the study and signed an informed consent form in accordance with the principles embodied in the Declaration of Helsinki. This study was approved by the Ethics Review Committee of Zhongshan Ophthalmic Center. Participants were recruited prospectively and consecutively for this study, between April 2013 and July 2013. All subjects were from a Chinese Han population.
Participants were selected as a representative sample of patients and age- and
Results
A total of 92 subjects (eyes) were enrolled in the study: 35 were nonglaucoma controls and 57 were PACG patients. The demographic and clinical data of the 2 groups are summarized in Table 1. The mean age of the PACG patients and the normal control individuals was 60.8 ± 8.7 and 58.7 ± 15.7 years, respectively (p = 0.473). No significant difference was noted in sex distribution between the 2 groups. As would be expected, AL was significantly longer in normal eyes than in the PACG group (p <
Discussion
The intraoperative surgical caliper measurement was considered the gold standard because it provides a direct view and measurement. The correlation determined in this study between AS-OCT and surgical caliper measurements was considered good. This result matches the strong correlations found in a previous study.14 AS-OCT provides a good image of the structure of the superior rectus muscles with satisfactory reliability and accuracy. In the present study, the mean limbus-insertion distance of
Conclusions
We found that AS-OCT can provide a good image of the structure of the superior rectus muscles with satisfactory accuracy for the measurement of the limbus-insertion distance. The limbus-insertion distance of the superior rectus was shorter in PACG eyes than in normal eyes. Shorter limbus-insertion distance of the superior rectus was significantly associated with shorter AL and “crowded” angle (smaller ACD, ACW, ACA, and ACV). Thus, a shorter limbus-insertion distance may be another anatomic
Disclosure
The authors have no proprietary or commercial interest in any materials discussed in this article.
Acknowledgements
This work was supported in whole or in part by the National Natural Science Foundation of China (81371008, 81200670), and the Science and Technology Planning Project of Guangdong Province, China (No. 2012B031800353).
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