When cataract reaches a certain level, it is easy to induce glaucoma, especially closed-angle glaucoma. This is because as cataract progresses, the patient’s lens will gradually thicken, plus the Asian anterior segment of the eye is more crowded, which will gradually narrow or even close the atrial angle, and the flow of atrial water will be blocked, resulting in the accumulation of atrial water in the eye, which will cause glaucoma. Just like the increasing sediment in the river, the river channel will gradually become narrower and the water flow will be blocked, at this time, once the water flow increases, it will cause a break in the dike, which means that an acute attack of glaucoma will break out.