Definition of the GDx parameters analysed
| TSNIT average | the average RNFL thickness around the calculation circle |
| SUP | the average RNFL thickness in the superior 120° region of the calculation circle |
| INF | the average RNFL thickness in the inferior 120° region of the calculation circle |
| SD | this measure represents the standard deviation of the values contained in the calculation circle |
| NFI | it is a global measure based on the entire RNFL thickness map calculating using an advanced form of neural network to discriminate normal from glaucoma |