What condition is characterized by increased resistance to blood flow due to closure of the anterior chamber angle?

The condition characterized by increased resistance to blood flow due to the closure of the anterior chamber angle is closed-angle glaucoma. In this condition, the angle between the iris and cornea becomes narrowed or completely blocked, preventing normal aqueous humor drainage from the eye. This blockage leads to a sudden increase in intraocular pressure, which can cause significant damage to the optic nerve and result in vision loss if left untreated.

Closed-angle glaucoma often presents with acute symptoms such as severe eye pain, headache, nausea, vomiting, and blurred vision, differentiating it from open-angle glaucoma, which typically develops more gradually and is less symptomatic in its early stages. Other options listed, such as acute conjunctivitis and retinal detachment, do not involve the mechanism of increased resistance due to the anterior chamber angle closure. Therefore, closed-angle glaucoma is the appropriate diagnosis in this context.