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Ciliary block glaucoma is an important differential diagnosis of shallow anterior chamber, angle closure and high intraocular pressure, which may occur spontaneously or following laser or surgery. Some underlying mechanisms of ciliary block glaucoma remain poorly understood but lens\u2010ciliary body apposition and anterior hyaloid changes with increased hydraulic resistance are major pathogenic factors. An understanding of the pathogenic factors facilitates early recognition of ciliary block glaucoma, and aids a logical sequence of intervention. 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