Angle closure is well documented to be more severe in dilation [1, 2]. In addition, many anatomical and physiological factors associated with dilation may also contribute to severity of angle-closure. For example, population-based studies have shown that the prevalence rates of primary angle closure glaucoma (PACG) are relatively high among Asian population, particularly older women. Three potential causes for dilation-induced angle-closure have been reported: iris volume change (or lack thereof), posterior location of the dilator muscle, and (dynamic) pupillary block.

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