Table 3: Feature importance calculated by GBDT (top 10).

No.FeaturesFeature importance

1Horizontal disc angle1.000
2Spherical equivalent0.723
3Average cup depth0.427
4Nasal rim/disc area ratio0.284
5Age0.145
6cpRNFLT (superior sector in four sectors)0.136
7cpRNFLT (temporal superior sector in six sectors)0.127
8Cup area0.040
9Maximum cup depth0.038
10Superior nasal rim/disc area ratio0.038