Correlations between optic disc variables and age (x) and temporal quadrant integral of RNFL thickness (y) in 38 normal subjects.
| Variable | Equation | p Value | R | R2 |
| Age | y = 2.8E−04x + 0.111 | 0.332 | −0.162 | 0.026 |
| Disc area | y = 0.011x + 0.072 | 0.303 | 0.172 | 0.029 |
| Average depth | y = 0.005x + 0.102 | 0.952 | 0.016 | 0.000 |
| C/D ratio | y = 0.031x + 0.087 | 0.204 | 0.211 | 0.044 |
| Contour modulation | y = 0.113x + 0.085 | 0.547 | 0.157 | 0.025 |
| Contour variation | y = 0.116x + 0.052 | 0.253 | 0.293 | 0.086 |
| ½ depth area | y = 0.003x + 0.101 | 0.948 | 0.017 | 0.000 |
| ½ depth volume | y = −0.002x + 0.101 | 0.994 | −0.002 | 0.000 |
| Effective area | y = 0.014x + 0.086 | 0.103 | 0.269 | 0.072 |
| Maximum depth | y = −0.024x + 0.085 | 0.256 | −0.189 | 0.036 |
| Mean contour depth | y = −0.033x + 0.099 | 0.314 | −0.168 | 0.028 |
| NRA | y = −0.009x + 0.111 | 0.382 | −0.146 | 0.021 |
| Volume above | y = −0.034x + 0.109 | 0.209 | −0.209 | 0.043 |
| Volume below | y = −0.035x + 0.091 | 0.165 | −0.230 | 0.053 |