Abstract: The mechanism of angle closure glaucoma is unclear. Although a direct causal relationship between choroidal volume changes and angle closure glaucoma has not been established, angle closure glaucoma has thicker choroidal thickness and higher proportion of choroidal effusion. Obstruction of venous return and abnormal distribution of arterial blood flow may be the possible mechanism of increased choroidal volume in angle closure glaucoma. Increased choroidal volume may be a key factor in the development of angle-closure glaucoma.(Int Rev Ophthalmol, 2023, 47: 104-109)

Key words: angle closure glaucoma, choroid volume