UWorld Internal Medicine Practice Test

A classical symptom of acute angle-closure glaucoma is the presence of a painful red eye. This condition occurs when the drainage angle of the anterior chamber of the eye becomes blocked, leading to a rapid increase in intraocular pressure. The sudden rise in pressure can cause severe eye pain, redness, and a feeling of fullness in the eye. Patients often describe the pain as intense and can be accompanied by other symptoms such as headache, nausea, and vomiting.

The red eye arises due to conjunctival injection and the irritation that results from increased intraocular pressure. Since acute angle-closure glaucoma is a medical emergency, the immediate recognition of a painful red eye is crucial for timely treatment to prevent vision loss.

While symptoms like visual field loss, hazy vision, and headache can occur with other eye conditions or even later in the course of glaucoma, they are not the hallmark presentations of acute angle-closure glaucoma as the painful red eye is. Quick identification of the painful red eye can lead to prompt medical intervention, which is essential to alleviate intraocular pressure and minimize potential damage to the optic nerve.