On the ocular anatomy diagram shown in Figure 1, we can identify the different parts of the eye related to the retinal fundus images.![Figure 1: Eye anatomy with a focus on the fundus part of the eye](https://i.postimg.cc/1XDy8XRc/scheme-eye.png)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Eye anatomy with a focus on the fundus part of the eye

Damages on the optic nerve can be spotted by professional examination of the Optic Disc (OD) and the Optic Cup (OC) located inside the OD [[3]](https://www.hindawi.com/journals/joph/2015/180972/).

Figures 2 and 3 respectively show a healthy eye and a glaucomatous eye, taken from the dataset.
![Figure 2: Optic Disc, Optic Cup and Fovea in fundus healthy eye fundus image](https://i.postimg.cc/C5NYYtxw/OC-OD-F.png)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: Optic Disc, Optic Cup and Fovea in fundus image

![cup_h_disc_h.png](https://i.postimg.cc/CMmkcKw6/cup-h-disc-h.png)
Figure 3: Disc height (OD height) and Cup height (OC height) used in vCDR are represented on a glaucomatous eye fundus image.

As shown in Figures 4 and 5, one relevant feature for glaucoma detection is the vertical Cup-to-Disc Ratio (vCDR) which is the ratio between OC and OD heights, both represented in Figure 3. 

![vCDR](https://i.postimg.cc/KztCSpmJ/Capture-d-cran-2021-04-14-10-25-09.png)

Although other relevant markers exist (Figure 5), the vCDR is the easiest to exploit. The baseline method presented in the following section is thus based on the computation of the vCDR.

![Figure 4: Comparison of Optic Disc (OD) and Cup (OC) for healthy and Glaucomatous eyes. A cupping effect is observed in the second case.](https://i.postimg.cc/GpNKXJGK/g-vs-h.png)
Figure 4: Comparison of Optic Disc (OD) and Cup (OC) for healthy and Glaucomatous eyes. A cupping effect is observed in the second case.

![Figure 5: Three relevant markers for glaucoma.](https://i.postimg.cc/W3GZ0Mnh/g-signs.png)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; Figure 5: Three relevant markers for glaucoma.