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In 1990, Fleck calculated that an iridotomy of 10–15 μm diameter should theoretically prevent angle closure glaucoma due to pupil block.1 This was consistent with the required iridotomy diameter previously reported by Wheeler.2 Fleck used Navier–Stokes continuity equations and assumed an iris thickness of 50 μm. …
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.