| 
      
        |  | Total | Argon group | PASCAL group | P value |  
        |  | N=49 eyes | N=26 eyes | N=23eyes |  |  
        | Before PRP |  |  |  |  |  
        | Retinal thickness | 279.84    ±26.62 | 280.19±26.86 | 279.43±26.95 | 0.922 |  
        | Choroidal thickness | 298.43±43.67 | 295.96±29.89 | 301.22±55.95 | 0.690 |  
        | Total retinal volume | 9.19±0.63 | 9.20±0.69 | 9.18±0.56 | 0.906 |  
        | Total choroidal volume | 8.12±1.10 | 8.17±1.03 | 8.06±1.20 | 0.726 |  
        | After PRP |  |  |  |  |  
        | Retinal thickness | 308.06±50.75 | 314.11±63.33 | 301.22±31.13 | 0.594 |  
        | Choroidal thickness | 302.57±43.11 | 300.31±24.29 | 305.13±58.08 | 0.714 |  
        | Total retinal volume | 9.72±0.82 | 9.82±1.00 | 9.61±0.55 | 0.343 |  
        | Total choroidal volume | 8.16±1.17 | 8.22±1.08 | 8.08±1.27 | 0.682 |  
        | Change after PRP |  |  |  |  |  
        | ΔRetinal thickness | 28.22±39.90 | 33.92±50.45 | 21.78±22.37 | 0.293 |  
        | ΔChoroidal thickness | 3.65±18.05 | 4.35±20.94 | 3.91±15.25 | 0.935 |  
        | ΔTotal retinal    volume | 0.53±0.39 | 0.62±0.47 | 0.43±0.24 | 0.071 |  
        | ΔTotal choroidal    volume | 0.04±0.30 | 0.05±0.27 | 0.03±0.35 | 0.766 |  | 
  
    | PRP: Panretinal Photocoagulation | 
  
    | Table 3: Subgroup comparison (argon laser vs. PASCAL laser) of topographic
    changes after panretinal photocoagulation. |