Abstract: Lens nuclear opacities can objectively reflect the degree of lens opacity in patients with nuclear cataract, and can also indirectly evaluate the difficulty of phacoemulsification and postoperative visual acuity recovery. At present, the international LOCS III grading method and the Emery grading method in China are subjectively graded by the degree of turbidity and color of the lens nucleus, which are qualitative analysis and have certain unrepeatability. Recently, objective lens nucleus opacities measurement methods such as Scheimpflug technology and optical correlation tomography (OCT) have been emerging, which not only can improve the high accuracy and repeatability, but also can be combined with machine deep learning to automatically predict cataract grading, which is conducive to the refined preoperative evaluation of cataract patients.

Key words: cataract lens, nuclear opacities