New considerations on pupillary block mechanim

Cronemberger, Sebastião; Calixto, Nassim; Andrade, André Oliveira de; Mérula, Rafael Vidal

doi:10.1590/s0004-27492010000100002

Cited by 11 publications

(11 citation statements)

References 24 publications

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“…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 ].…”

Section: Discussionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 98%

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

et al. 2022

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Background To study the iridolenticular contact area (ILCA) under different light conditions in acute primary angle closure (APAC). Methods This cross-sectional, observational study involved 22 unilateral APAC patients and 59 cataract patients (59 eyes). Images of the APAC eyes, fellow eyes and cataract eyes were collected by anterior segment optical coherence tomography (ASOCT) under different light conditions respectively. The ILCA, anterior chamber width (ACW), anterior chamber area (ACA), lens vault (LV), angle opening distance at 750 μm (AOD750), trabecular iris space area at 750 μm (TISA750) and iris area at 750 μm (IA750) were measured using Image J software. Results The ILCA of cataract eyes were significantly larger than APAC eyes (4.424 ± 1.208 vs 4.049 ± 2.725mm2, P = 0.034) and fellow eyes (4.424 ± 1.208 vs 3.651 ± 1.629 mm2, P = 0.008) under dark condition. Under dark condition, ILCA of APAC eyes was negatively correlated with AOD750 (r = -0.444, P = 0.038), TISA750 (r = -0.498, P = 0.018). The ILCA of cataract eyes under dark condition was significantly greater than under bright condition (4.424 ± 1.208 vs 2.526 ± 0.992 mm2, P < 0.001). Conclusions This study showed that ILCA in both APAC eye and fellow eye were smaller than cataract eye. Future study should focus on both the contact area and force at the interface of lens and iris with larger sample size.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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

et al. 2022

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“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Razeghinejad

Lashkarizadeh

Nowroozzadeh

et al. 2016

Journal of Optometry

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PurposeThe aim of this study was to evaluate the effects of pharmacologic mydriasis and Peripheral Iridotomy (PI) on ocular biometry and anterior chamber parameters in primary angle closure suspects.MethodsIn this prospective interventional case series, 21 primary angle closure suspects were enrolled. Intraocular pressure, refraction, ocular biometry (Lenstar, LS900), and anterior chamber parameters (Pentacam HR) were measured at four occasions: before PI (before and after mydriasis with phenylephrine) and two weeks after PI (before and after mydriasis). The study was conducted on both eyes and only one eye per patient, in random, was included in the analysis.ResultsThe mean age of the participants was 60 ± 7 years and 17 (81%) were female. There were no significant differences in intraocular pressure, refraction, keratometry, biometric and anterior chamber parameters between groups, except for anterior chamber volume, which showed increments with PI and mydriasis. The corresponding values for anterior chamber volume were as follows: 88.2 ± 13.7 mm3 before PI, undilated; 106.3 ± 18.8 before PI, dilated; 99.0 ± 14.6 after PI, undilated, and 107.4 ± 16.5 after PI, dilated (P < 0.001).ConclusionsThis study showed no change in the ocular biometric and anterior chamber parameters including iridocorneal angle after PI and/or pharmacologic mydriasis except for increments in anterior chamber volume. This factor has the potential to be used as a numerical proxy for iris position in evaluating and monitoring patients with primary angle closure suspects after PI.

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“…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 …”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Lockington

Luo

Wang

et al. 2011

Clinical Exper Ophthalmology

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New considerations on pupillary block mechanim

Cited by 11 publications

References 24 publications

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

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

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

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

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