Inclusion criteria:  age: 45-79 years old, BCVA>0.3. Clinical diagnosis of angle-closure glaucoma, with 19mm<axial length<24mm. Clinical diagnosis of age-related cataract (as control group), with 22mm<axial length<26mm. All the surgeries were finished by the same two experienced ophthalmologists. The first operated eye was included for observation.  Exclusion criteria:  Age-related cataract patients whose anterior chamber depth (ACD)<2.5mm. Patients who underwent ocular surgery, such as peripheral iridotomy, trabeculectomy. Patients with history of ocular trauma. Patients with other ophthalmic diseases that can cause shallow anterior chamber expect glaucoma and cataract, such as choroid detachment, ciliary body detachment, retinal detachment, bulbar tumor, etc. Secondary glaucoma, such as neovascular glaucoma.