| 
      
        | Diopter | Base    hospital | Surgical    eye camps |  
        | n    (%) | n    (%) |  
        | 14    -18 | 13    ( 5.9) | 7    (3.1) |  
        | 18.5-19.5 | 10    (4.5) | 13    (5.8) |  
        | 20-20.5 | 26    (11.8) | 30    (13.4) |  
        | 21-21.5 | 41    (18.6) | 36    (16.1) |  
        | 22-22.5 | 60    (27.1) | 55    (24.6) |  
        | 23-23.5 | 44    (19.9) | 42    (18.8 |  
        | 24-24.5 | 18    (8.1) | 23    (10.3 |  
        | >25 | 9    (4.1) | 18  (8) |  
        | Total | 221    (100) | 224    (100) |  |