title: Change in subfoveal choroidal thickness after argon laser panretinal photocoagulation.
abstract: OBJECTIVE
  To evaluate changes in subfoveal choroidal thickness (SFCT) and macular thickness as measured by enhanced depth imaging spectral-domain optical coherence tomography (EDI-OCT) after argon laser panretinal photocoagulation (PRP) in patients with severe diabetic retinopathy.
  
  
  METHODS
  This prospective, comparative case series included 21 patients (28 eyes) with severe diabetic retinopathy. All patients underwent three sessions of PRP. The SFCT and macular thickness were measured using EDI-OCT at baseline and one week after completion of 3 sessions of PRP.
  
  
  RESULTS
  SFCT before PRP was (318.1±96.5)µm and increased to (349.9±108.3)µm (P=0.001) after PRP. Macular thickness significantly increased at one week after PRP (from 273.1±23.9µm at baseline vs 295.8±25.3µm at one week; P<0.001). No significant relationship between the changes in macular thickness and SFCT was observed (r=-0.13, P=0.52).
  
  
  CONCLUSIONS
  PRP induced increases in both SFCT and macular thickness. Changes in SFCT did not correlate with changes in macular thickness.
authors.affiliation: Department of Ophthalmology, Ewha Womans University School of Medicine, Seoul, Korea.
authors.forename: Ga Eun
authors.initials: GE
authors.lastname: Cho
authors.forename: Hee Yun
authors.initials: HY
authors.lastname: Cho
authors.forename: Yun Taek
authors.initials: YT
authors.lastname: Kim
keywords: EDI-OCT; choroidal thickness; diabetic retinopathy; macular edema; panretinal photocoagulation