What is a hallmark symptom of acute glaucoma?

Acute glaucoma, specifically acute angle-closure glaucoma, presents with a hallmark symptom of sudden vision loss. This condition arises when there is a rapid increase in intraocular pressure due to the blockage of the drainage angle of the eye. The sudden elevation in pressure can lead to significant damage to the optic nerve and rapid deterioration of vision, making it a critical condition requiring immediate medical attention.

In addition to sudden vision loss, individuals may experience severe eye pain, headache, nausea, vomiting, and halos around lights. The acute nature of this condition is what distinguishes it from other types of glaucoma, where vision loss tends to be more gradual and insidious. The immediate onset of symptoms is why sudden vision loss is a key indicator of acute glaucoma.