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Plateau iris in Whites versus Asians.
Thidarat Leeungurasatien1, Sunita Radhakrishnan, Travis Porco
1Department of Ophthalmology, University of California, San Francisco, CA, USA.
Eye Science
|March 27, 2012
Summary
The prevalence of plateau iris, a condition diagnosed by ultrasound biomicroscopy, was similar in White and Asian patients following laser peripheral iridotomy. This finding highlights plateau iris as a common clinical entity in narrow angle patients across different ethnicities.
Area of Science:
- Ophthalmology
- Anatomic studies
- Diagnostic imaging
Background:
- Plateau iris is a morphologic variant characterized by anteriorly rotated ciliary processes and a flat iris, potentially leading to narrow angles.
- Laser peripheral iridotomy (LPI) is a common treatment for narrow angles, aiming to reduce iris bombe and prevent angle closure.
- Understanding the prevalence of plateau iris across different ethnicities is crucial for risk stratification and management.
Purpose of the Study:
- To compare the prevalence of plateau iris diagnosed via ultrasound biomicroscopy (UBM) in White versus Asian patients after LPI.
- To assess the diagnostic utility of UBM in identifying plateau iris in a diverse U.S. clinic population.
Main Methods:
- A prospective, observational study included 55 narrow angle patients undergoing LPI.
- Ultrasound biomicroscopy was performed before and 4-6 weeks after LPI in one eye.
- Plateau iris was diagnosed based on specific UBM criteria indicating anterior ciliary process direction, absent ciliary sulcus, and a flat central iris plane.
Main Results:
- The study included 28 White (50.1%) and 27 Asian (49.0%) subjects.
- Plateau iris was diagnosed in 18 subjects (32.7%) overall.
- The prevalence of plateau iris did not significantly differ between White (32.1%) and Asian (33.3%) patients (P>0.99).
Conclusions:
- The prevalence of plateau iris is comparable between White and Asian individuals.
- Plateau iris represents a significant clinical finding in a substantial proportion of narrow angle patients, irrespective of ethnicity.
- UBM is a valuable tool for diagnosing plateau iris in post-LPI patients.
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