Chronic angle closure glaucoma — pathophysiology and peripheral anterior synechiae

A 68-year-old man of Indian descent presents with a 6-month history of gradual dimming of vision in the right eye. On examination, the intraocular pressure (IOP) is 32 mmHg in the right eye and 14 mmHg in the left eye. Gonioscopy reveals a narrow angle with peripheral anterior synechiae in the right eye. The optic disc shows a cup-to-disc ratio of 0.8 with superior and inferior notching. Visual field analysis demonstrates a superior arcuate defect. Which of the following mechanisms best explains the elevated IOP in this patient?