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Gonioscopy findings and prevalence of occludable angles in a Burmese population: the Meiktila Eye Study
  1. R J Casson1,
  2. H S Newland1,
  3. J Muecke1,
  4. S McGovern1,
  5. L M Abraham1,
  6. W K Shein2,
  7. D Selva1,
  8. T Aung3
  1. 1South Australian Institute of Ophthalmology, Department of Ophthalmology & Visual Sciences, Adelaide University, Adelaide, South Australia
  2. 2Trachoma Control and Prevention Programme, Meiktila Eye Hospital, Meiktila, Myanmar
  3. 3Yangon Eye Hospital, Yangon, Myanmar
  1. Correspondence to: Professor R J Casson Department of Ophthalmology & Visual Sciences, South Australian Institute of Ophthalmology, Adelaide University, South Australia 5000, Australia; robert.casson{at}


Aim: To determine the prevalence of preglaucomatous angle-closure disease in central Myanmar.

Methods: A population-based survey of inhabitants ⩾40 years in the Meiktila District was carried out; 2481 subjects were identified, 2076 participated and 2060 underwent gonioscopy of at least one eye. Eyes with angles traditionally described as “occludable” were recorded as primary angle-closure suspects (PACS); eyes with PACS and peripheral anterior synechiae (PAS), or an increased intraocular pressure but without primary angle-closure glaucoma, were recorded as primary angle closure (PAC).

Results: The prevalence of PACS in at least one eye was 5.7% (95% CI 4.72 to 6.62); prevalence increased with age and was more common in women (p<0.001). The prevalence of PAC in at least one eye was 1.50% (95% CI 1.47 to 1.53). All participants with PAS had at least 90° of closure (range 90–360°).

Conclusion: The prevalence of preglaucomatous angle-closure disease (PACS and PAC) in this population was 5.7% and 1.5%, respectively. PACS was more common in women, and its prevalence increased with age.

  • GON, glaucomatous optic neuropathy
  • IOP, intraocular pressure
  • ISGEO, International Society for Geographical and Epidemiological Ophthalmology
  • MOH, Meiktila Eye Study
  • PAC, primary angle closure
  • PACG, primary angle-closure glaucoma
  • PACS, primary angle-closure suspects
  • PAS, peripheral anterior synechiae
  • VDCR, vertical cup:disc ratio
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  • Competing interests: None.

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