Predicting glaucoma development with longitudinal deep learning predictions from fundus photographs.

Abstract Purpose To assess whether longitudinal changes in a deep learning algorithm’s predictions of retinal nerve fiber layer (RNFL) thickness based on fundus photographs can predict future development of glaucomatous visual field defects. Design Retrospective cohort study Methods This study included 1072 eyes of 827 glaucoma-suspect patients with an average follow-up of 5.9 ± 3.8 years. All eyes had normal standard automated perimetry (SAP) at baseline. Additional SAP and fundus photographs were acquired throughout follow-up. Conversion to glaucoma was defined as repeatable glaucomatous defects on SAP. An OCT-trained deep learning algorithm (Machine to Machine, M2M) was used to predict RNFL thicknesses from fundus photographs. Joint longitudinal survival models were used to assess whether baseline and longitudinal change in M2M’s RNFL thickness estimates could predict development of visual field defects. Results 196 eyes (18%) converted to glaucoma during follow-up. The mean rate of change in M2M’s predicted RNFL thickness was -1.02 μm/y for conversors and -0.67 μm/y for non-conversors (P Conclusions Longitudinal changes in a deep learning algorithm’s predictions of RNFL thickness measurements based on fundus photographs can be used to predict risk of glaucoma conversion in eyes suspected of having the disease.