In the panretinal photocoagulation group, the average vascular densities of the macula were 13.5 ± 3.6 mm⁻¹ before treatment, and 14.7 ± 3.1 mm⁻¹ after 1 week, 13.7 ± 2.6 mm⁻¹ after 1 month, and 12.8 ± 3.8 mm⁻¹ after 3 months of treatment. The average vascular densities of the optic disc were 14.7 ± 5.2 mm⁻¹ before treatment, and 14.1 ± 4.7 mm⁻¹ after 1 week, 14.8 ± 5.3 mm⁻¹ after 1 month, and 15.0 ± 4.7 mm⁻¹ after 3 months of treatment. The average subfoveal choroidal thicknesses were 327.5 ± 57.9 µm before treatment, and 334.4 ± 52.5 µm after 1 week, 291.2 ± 52.9 µm after 1 month, and 286.3 ± 44.4 µm after 3 months of treatment.