Number of clusters

According to the elbow criteria we decided to create 4 clusters, since the reduction in the intra-groups variability is not important for more than 4 groups.

K-means clusters

Map of glaucoma stages whithout healty eyes

As can be seen in this chart, the four clusters can be separated almost perfectly along the x-axis of the first principal component.

Map of glaucoma stages whith healty eyes

Distribution of the first principal component by glaucoma stages

Confidence intervals of means by glaucoma stages