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- Title
Evaluation of anterior chamber angle by van Herick grading and ultrasound biomicroscopy in light and dark conditions for finding appositional angle closure and plateau iris configuration.
- Authors
Uejyo, Chiharu; Henzan, Ichiko Medoruma; Nakamura, Yuko; Ishikawa, Shusaku; Sakai, Hiroshi; Sawaguchi, Shoichi; Kumar, Rajesh S.; Iwase, Aiko; Tomidokoro, Atsuo; Araie, Makoto
- Abstract
Purpose: To evaluate association of the van Herick (VH) grades with the ultrasound biomicroscopic (UBM) parameters, appositional irido‐trabecular contact (A‐ITC) and plateau iris (PI) in a randomly sampled population. Methods: A 10% random sample of all residents aged 40 or older of the Kumejima study underwent UBM under dark and light conditions in the four quadrants of right eyes. Results: Of 301 right eyes with eligible UBM images, 101 (33.6%) and 200 (66.4%) were classified as VH ≤ 2 and VH ≥ 3, respectively. The UBM parameters on angle width and ciliary body configuration were significantly different between VH ≤ 2 and VH ≥ 3 eyes (p < 0.001). A‐ITC was found in at least one quadrant in 54.5% and 75.2% of VH ≤ 2 eyes under light and dark conditions, respectively; and 20.5% and 45.5% of VH ≥ 3 eyes. When 'VH ≤ 2' was used to screen eyes with A‐ITC in three or more quadrants, the sensitivity and specificity were 74.1% and 75.3%, respectively. A‐ITC was significantly associated with shallower anterior chamber (p = 0.018) and higher intraocular pressure (p = 0.044) in VH ≥ 3 eyes. Plateau iris (PI) was found in 15.8% and 6.0% of VH ≤ 2 and VH ≥ 3 eyes, respectively. Plateau iris (PI) was significantly associated with the UBM parameters on angle width and ciliary body configuration. When 'VH ≤ 2' was used to screen eyes with PI, the sensitivity and specificity were 57.1% and 68.9%, respectively. Conclusions: The VH grade of ≤2 and ≥3 showed significant association with UBM angle width and ciliary body configuration parameters. The VH ≤ 2 criterion should be useful for screening of A‐ITC and PI.
- Subjects
ANTERIOR chamber (Eye); CILIARY body; GLAUCOMA; PLATEAUS; ANGLE-closure glaucoma; TONOMETERS
- Publication
Acta Ophthalmologica (1755375X), 2021, Vol 99, Issue 1, pe86
- ISSN
1755-375X
- Publication type
Article
- DOI
10.1111/aos.14502