To evaluate changes in subfoveal choroidal thickness (SFCT) after Pattern Scan Laser (PASCAL) panretinal photocoagulation (PRP) in patients with diabetic retinopathy.


This study included 39 patients (50 eyes) treated with PRP using PASCAL then followed for at least 3 months. Patients were classified into 2 groups according to severity: very severe non-proliferative diabetic retinopathy (NPDR) and proliferative diabetic retinopathy (PDR). SFCT was measured by enhanced depth imaging (EDI) optical coherence tomography (OCT) (Cirrus-HD OCT, Carl Zeiss). The changes of SFCT was analyzed at 1 and 3 months after PRP.


SFCT was 270.42 ± 61.44 ㎠› before PRP, 264.52 ± 60.78 um at 1 month and 255.74 ± 56.89 um at 3 months after PRP. Significant change of SFCT was found at 3 months after PRP (p=0.036). Central macular thickness (CMT) was 275.56 ± 50.61 um before PRP and increased to 295.18 ± 52.80 um and 293.10 ± 57.24 um at 1, 3 months post-treatment (p=0.001, 0.007). There were no significant differences between groups in baseline and amount of change in SFCT after PRP.


After PASCAL laser PRP, SFCT showed no significant change at 1 month, but significantly decreased at 3 months.

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