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G. Kumar, A. Sharma, A. Panda, S. Bhartiya, I. Bhatiya, T. Dada; Prevalence of Plateau Iris in Indian Eyes With Primary Angle Closure Glaucoma (PACG). Invest. Ophthalmol. Vis. Sci. 2010;51(13):5526.
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To determine the prevalence of plateau iris in North Indian PACG patients using ultrasound biomicroscopy (UBM).
PACG patients with a patent peripheral laser iridotomy attending the glaucoma clinic were recruited in this observational cross-sectional study. PACG was defined as closed angle (posterior trabecular meshwork was not visible in more than 2 quadrant on indentation gonioscopy with a Sussman gonioscope) with optic nerve head changes typical of a glaucomatous optic neuropathy. UBM was performed using P 40 machine (Paradigm Medical Industries, Salt Lake City, UT) in one randomly selected eye of each patient. Plateau iris was defined in a quadrant by the presence of all of the following features: a steep iris configuration with a closed angle (irido-corneal contact), an anteriorly directed ciliary body and an absent ciliary sulcus. Eyes with the above features in two or more quadrants were classified as plateau iris.
Fifty one patients with a mean age of 56.4 ± 6.8 years were evaluated. There were 32 females and 19 males. Plateau iris was found in 10 (19.6%) eyes. Superior quadrant was most common quadrant to have plateau iris. None of the eyes had plateau iris in all 4 quadrants, 3 eyes (5.8%) had involvement of 3 quadrants, 7 eyes (13.7%) had only 2 quadrants involved, and 1 quadrant alone was involved in 4 eyes (7.8%).
One in five eyes with PACG were found to have plateau iris. UBM evaluation should be performed in eyes with PACG post laser iridotomy to evaluate presence of non-pupillary block mechanisms for angle closure.
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