Plateau iris configuration in eyes with narrow-angle: an ultrasound biomicroscopic study

Hidden mechanisms beyond the pupillary block in acute angle closure: ultrasound biomicroscopic study

“…In the noniridotomized group, no patient had PL as a single mechanism. Reported incidences of PL in AAC eyes were from 2.5% to 6.3% . PL accounts for a large proportion of non‐pupillary block component of angle closure in subjects of non‐Asian ethnicity .…”

Prevalence and characteristics of plateau iris configuration among American Caucasian, American Chinese and mainland Chinese subjects

“…After PIC was initially described,10 11 some researchers reported its prevalence among PACG patients as 30% in Singapore,12 30% in India,13 47.8% in China14 and 37.0% in Japan 15. In addition, recent research also reported PIC in POAG 16. These prior studies were in subjects from Asia.…”

Enhancing the Early Differential Diagnosis of Plateau Iris and Pupillary Block Using A-Scan Ultrasonography

“…Under indentation gonioscopy, pupillary block eye is recognized by increased iris convexity and peripheral iris apposition to the trabeculum meshwork, and plateau iris has the appearance of double iris hump. When plateau iris is suspected, ultrasound biomicroscopy (UBM) is most often used to collect ocular biometric measurements [ 4 – 6 ]. It shows that the two abnormalities have different morphologies.…”

“…Several studies using A-scan ultrasonography have reported PACG eyes to have a shallow anterior chamber, thickened lens, anterior positioned lens, and shorter axial length [ 7 – 10 ].However, these studies excluded plateau iris eyes, a rarer, more difficult to diagnose abnormality. Some studies used UBM to get information about ocular biometry of plateau iris [ 4 – 6 ].However, UBM could evaluate angle anatomy but could not assess lens thickness or axial length ( Fig. 2 ).…”