By C. Hong, T. Yamamoto, K.H. Park, Y.Y. Kim
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Extra resources for Angle Closure Glaucoma
They suggested that this finding supports the theory of direct lens block, that is, block due to forward movement of the lens. 28-31 Lens-related mechanism can also act in concert with other mechanisms. Changes in the lens antero-posterior thickness and forward lens positioning are also related to increased pupillary block. A lens may be susceptible to anterior movement due to zonular instability. 32 A smaller corneal diameter, in the presence of a normal-sized lens, would decrease the ciliorenticular distance, and this phenomenon can lead to zonules slackness.
Inoue T, Yamamoto T, Kitazawa Y. Distribution and morphology of peripheral anterior synechiae in primary angle-closure glaucoma. J Glaucoma 1993;3:171-6. 47. Mok KH, Lee VW. Synechial angle closure pattern in Chinese chronic primary angle-closure glaucoma patients. J Glaucoma 2001;10:427-8. 48. Phillips CI. Closed-angle glaucoma: Significance of sectorial variations in angle depth. Br J Ophthalmol 1956;40:136-43. indb 40 16-8-2007 9:46:32 Classification 41 Classification Ningli Wang, Sizhen Li and Yuanbo Liang Tongren Eye Center, Capital University of Medical Science, Beijing, China Introduction The most appropriate method of classification of angle-closure glaucoma has been a matter of considerable debate.
Traditionally, the pupillary block-angle closure-peripheral iridotomy principle has been the core concept in the pathophysiology of primary angle-closure glaucoma. However, several mechanisms including pupillary block, plateau iris, lens-related block, and others alone or in combination, can cause contact between the iris and trabecular meshwork. Mechanism of angle closure Pupillary block The concept of pupillary block is centered on the pressure gradient created between the anterior and posterior chambers.