Reverse engineered accuracy, sensitivity and specificity scores prove that uncomparable performance figures are compared and ranked in almost all papers on retinal vessel segmentation.
Further details in the paper:
https://www.researchgate.net/publication/350236730_Numerical_identification_of_methodological_inconsistencies_affecting_the_evaluations_in_100_papers_on_retinal_vessel_segmentation_and_a_new_baseline_for_the_field