Table 4

Effect of age on optic disc variables

VariableEquationp Value R
Contour variationy = 0.265+0.002x0.1340.173
Mean contour depthy = −0.112+0.002x0.2200.141
Cup shapey = −0.079+0.001x0.4050.095
Effective areay = 1.296−0.005x0.413−0.095
1/2 depth areay = 0.688−0.005x 0.131−0.173
C/D ratio y = 0.536−0.002x0.332−0.114
NRRA y = 0.988+0.009x0.1500.167
Volume abovey = 0.152+0.001x0.3990.118
Volume belowy = −0.397+0.002x0.3420.109
1/2 depth volumey = −0.100+0.001x0.1540.164
Average depthy = −0.265+0.001x0.6270.055
Maximum depthy = −0.231−0.006x0.076−0.205
Average slopey = 30.113+0.034x0.7390.045
Maximum slopey = 72.987+0.097x0.1910.152
  • R = correlation coefficient; C/D = cup/disc; NRRA = neuroretinal rim area.