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Swept-source optical coherence tomography assessment of iris–trabecular contact after phacoemulsification with or without goniosynechialysis in eyes with primary angle closure glaucoma
  1. Tin A Tun1,
  2. Mani Baskaran1,2,3,
  3. Shamira A Perera1,
  4. Hla M Htoon1,3,
  5. Tin Aung1,2,3,
  6. Rahat Husain1
  1. 1Singapore Eye Research Institute and Singapore National Eye Centre, Singapore, Singapore
  2. 2Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
  3. 3Duke-NUS Graduate Medical School, National University of Singapore, Singapore, Singapore
  1. Correspondence to Professor Tin Aung, Singapore National Eye Centre, 11 Third Hospital Avenue, Singapore 168751, Singapore; aung.tin{at}snec.com.sg

Abstract

Aims To compare the change in iris–trabecular contact (ITC) area using swept-source optical coherence tomography (SS-OCT) in eyes with primary angle closure glaucoma (PACG) and cataract that underwent phacoemulsification (PE) with intraocular lens implantation alone compared with PE with goniosynechialysis (GSL).

Methods One eye of 22 patients with PACG with peripheral anterior synechiae (PAS) detected by indentation gonioscopy was randomised into two groups (PE alone (n=11) and PE+GSL (n=11)). The anterior chamber angles were evaluated by SS-OCT under dark conditions before and 12 months after surgery using the three-dimensional angle analysis scan protocol that simultaneously obtains 128 cross-sectional radial scans across the anterior chamber at equal intervals (every 1.4°). The ITC area, defined as the area of extent of the circumferential contact of peripheral iris to the angle wall, was computed automatically by SS-OCT after an observer marked the scleral spurs of all 128 scans of each eye.

Results The majority of the 22 subjects were women (77.3%) and the mean±SD age was 67.3±5.8 years. The ITC area was significantly reduced in the PE+GSL group compared with the PE alone group (10.2 mm2 vs 4.6 mm2, β=0.54, p=0.03) after adjusting for age, gender, intraocular pressure, extent of PAS and pupil diameter before surgery. Smaller iris volume at baseline was associated with greater ITC area reduction by PE+GSL (β=−0.728, p=0.03).

Conclusions Eyes that undergo PE+GSL surgery have a greater reduction in circumferential ITC area than eyes that undergo PE alone.

  • Anterior chamber
  • Glaucoma
  • Imaging
  • Intraocular pressure

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