Wang W, Zhang J, Gu X, et al. - Researchers conducted this cross-sectional study to measure the lens nuclear opacity using swept-source anterior segment optical coherence tomography (SS-ASOCT) and to assess its correlations with Lens Opacities Classification System III (LOCS-III) system and surgical parameters, as well as to evaluate the diagnostic performance for hard nuclear cataract. Participants in the study were 1,222 eligible patients for cataract surgery (1,222 eyes). The nuclear density had good performance in classifying hard nuclear cataract, with area under the curves of 0.859 for average nuclear density and 0.796 for maximum nuclear density. Objective and quantitative lens nuclear density measurement using SS-ASOCT images enables a precise diagnosis of hard nuclear cataracts.