New considerations on pupillary block mechanim

Comparison of iridolenticular contact area under different light brightness between post primary acute angle closure and cataract eyes

“…It is also suggested that the increase of the LV would lead to the increase of iridolenticular contact, which would lead to the increase of iris curvature and aggravate pupil block and crowding of anterior chamber angle [ 5 ]. However, more recent studies with new imaging techniques didn’t support the theory about iridolenticular contact in pupil block [ 11 , 19 ]. Recently, Woo EK had found that for patients with pupil block, the iridolenticular contact distance under dark condition was less than that under bright condition [ 12 ].…”

“…Nongpiur et al confirmed that the increase of anterior surface arch may increase iridolenticular contact, which may lead to the increase of iris curvature and aggravate pupil block and anterior chamber angle crowding [ 5 ]. However, other recent studies suggested that ILC was relatively small in pupil block and decreased with pupil dilation [ 11 , 12 ]. Thus, controversies exist regarding the role of iridolenticular contact in pupil block.…”

Changes in ocular biometry and anterior chamber parameters after pharmacologic mydriasis and peripheral iridotomy in primary angle closure suspects

“…The pupil dilation may result in pupillary block and development of APAC. 3 Moreover, it has been shown that AC parameters could be changed after pharmacologic mydriasis. 4 We aimed to measure any change in the ocular biometric characteristic and AC parameters using Lenstar LS 900 biometer (Haag-Streit AG, Koeniz, Switzerland) and Pentacam HR (Oculus, Wetzlar, Germany) before and after pharmacologic mydriasis in patient with PACS before and after Peripheral Iridotomy (PI).…”

Mathematical and computer simulation modelling of intracameral forces causing pupil block due to air bubble use in Descemet's Stripping Endothelial Keratoplasty: the mechanics of iris buckling

“…Angle closure following DSEK has been reported on day 1 post surgery, with the mechanism determined by the location of the air to the iris 7 . Clinical ultrasound biomicroscopy studies have demonstrated shallow anterior chamber depth and associated iris convexity in the setting of pupil block, and correlated a decreased angle with increased iris thickness 8,9 …”

“…7 Clinical ultrasound biomicroscopy studies have demonstrated shallow anterior chamber depth and associated iris convexity in the setting of pupil block, and correlated a decreased angle with increased iris thickness. 8,9 Floppy iris syndrome has been shown to complicate cataract surgery and has been linked with the use of alpha blockers. [10][11][12] Morphological studies report structural alterations to the iris dilator muscle and corresponding antagonized smooth muscle contractions.…”