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Anubha Rathi, Gaurav Kumar, Reetika Sharma, Vishal Arora, Meenakshi Wadhwani, Amit Sobti, Tanuj Dada; Prevalence of Plateau Iris in Primary Angle Closure Suspects in North India. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4465.
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To evaluate the presence of plateau iris configuration in Primary Angle Closure Suspects (PACS) post laser iridotomy using Ultrasound Biomicroscopy (UBM) in a North Indian population.
In this cross sectional study, 76 eyes of 76 PACS patients from North India were evaluated with a 50 MHz UBM machine. Primary Angle Closure Suspect was defined as posterior trabecular meshwork not visible on gonioscopy in at least two quadrants. Eyes with any peripheral anterior synechiae, IOP > 21 mmHg or signs of glaucomatous optic neuropathy were excluded. All patients underwent Nd:YAG laser peripheral iridotomy (LPI) and UBM was performed between 4-6 weeks post LPI. Plateau iris was defined in a quadrant as the presence of anteriorly directed ciliary body with an absent ciliary sulcus, pushing iris anteriorly to make irido-angle contact. An eye was labelled as plateau iris if the above criteria were present in at least 2 quadrants.
Seventy four eyes of 74 subjects (41 females, 33 males) with a mean age (SD) of 56.8 (6.2) years were evaluated. Plateau iris was found in 21 (28.3%) eyes. Among all eyes with plateau iris, 13 (61.9%) eyes had plateau iris in two quadrants, 7 (33.3%) eyes had plateau iris in three quadrants and 1 eye had this configuration in all four quadrants. Plateau iris was most commonly observed in the superior quadrant.
Plateau iris was found in nearly one third of PACS eyes after LPI. This may be an important non pupillary block mechanism for persistent angle closure and disease progression in the native PACS population.
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