Table 2

 Mean values (SD) of contrast sensitivity, assessed at five spatial frequencies, in the better eyes in prematurely born and full term children

Better eye1.5 cycles/deg3 cycles/deg6 cycles/deg12 cycles/deg18 cycles/deg
Significant differences between controls and prematures at 1.5 cycles/deg (p = 0.03), 3 cycles/deg (p<0.001), 6 cycles/deg (p<0.001), 12 cycles/deg (p<0.001) and 18 cycles/deg (p<0.001).
Controls (n = 215)1.73 (0.18)2.11 (0.16)2.13 (0.17)1.92 (0.19)1.49 (0.23)
Prematures (n = 205)1.68 (0.17)2.02 (0.19)2.03 (0.24)1.80 (0.30)1.30 (0.34)
No ROP (n = 133)1.70 (0.17)2.03 (0.19)2.07 (0.19)1.85 (0.24)1.37 (0.27)
Mild ROP (n = 38)1.67 (0.16)2.01 (0.19)2.01 (0.20)1.78 (0.32)1.26 (0.40)
Severe ROP, untreated (n = 12)1.64 (0.15)1.98 (0.17)1.99 (0.18)1.77 (0.24)1.24 (0.23)
Cryotreated ROP (n = 22)1.63 (0.18)1.98 (0.25)1.86 (0.42)1.58 (0.50)0.96 (0.44)