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Prevalence and characteristics of plateau iris configuration among American Caucasian, American Chinese and mainland Chinese subjects
  1. Yingjie Li1,2,
  2. Ye Elaine Wang1,3,
  3. Guofu Huang2,
  4. Dandan Wang1,4,
  5. Mingguang He4,
  6. Mary Qiu1,
  7. Shan Lin1
  1. 1University of California, San Francisco, California, USA
  2. 2The Third Affiliated Hospital of Nanchang University, Nanchang, China
  3. 3Duke University, School of Medicine, Durham, North Carolina, USA
  4. 4State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
  1. Correspondence to Dr Shan C Lin, Department of Ophthalmology, University of California, 10 Koret way, Room K301, San Francisco, CA 94143-0730, USA; lins{at}vision.ucsf.edu

Abstract

Background To investigate the prevalence, risk factors and characteristics of plateau iris configuration (PIC) among American Caucasian, American Chinese and mainland Chinese.

Methods This multicentre, cross-sectional study of non-glaucomatous subjects (40–80 years) included 111 American Caucasian, 116 American Chinese and 110 mainland Chinese. Prevalence of PIC based on ultrasound biomicroscopy imaging was compared among the different ethnic groups. Risk factors and anterior segment optical coherence tomography-measured iris and angle parameters in eyes with PIC were compared.

Results The prevalence of PIC was 25.2% in American Caucasian, 24.1% in American Chinese and 20.9% in mainland Chinese (p=0.73). The presence of PIC was associated with more positive spherical equivalence (OR=1.31, p=0.002) and shorter axial length (OR=0.75, p=0.04). There were significant differences in angle recess area (ARA) (p=0.04), IT750 (p=0.007) and IT2000 (p<0.001) between Chinese and Caucasians who have PIC.

Conclusions The prevalence of PIC did not differ among American Caucasian, American Chinese and mainland Chinese. PIC was associated with non-myopia and shorter axial length. Chinese eyes with PIC had smaller ARA and thicker irides than Caucasian ones. PIC might be a physiological variation of the iris and ciliary body that exists in normal eyes, both in Chinese and Caucasians.

  • Glaucoma
  • Anatomy
  • Iris

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