  Amorphous solids lack long-range order. Therefore identifying structural
defects -- akin to dislocations in crystalline solids -- that carry plastic
flow in these systems remains a daunting challenge. By comparing many different
structural indicators in computational models of glasses, under a variety of
conditions we carefully assess which of these indicators are able to robustly
identify the structural defects responsible for plastic flow in amorphous
solids. We further demonstrate that the density of defects changes as a
function of material preparation and strain in a manner that is highly
correlated with the macroscopic material response. Our work represents an
important step towards predicting how and when an amorphous solid will fail
from its microscopic structure.
