What symptom is reported by patients in case of central retinal artery occlusion?

In the case of central retinal artery occlusion (CRAO), the hallmark symptom that patients typically report is sudden, painless unilateral vision loss. This symptom arises because the occlusion obstructs blood flow to the retina, leading to a rapid loss of function in that part of the eye. The lack of blood supply results in a sudden drop in vision, often described as a "curtain" coming down over the visual field.

The absence of pain is significant and contrasts with other ocular conditions that might cause visual loss with associated discomfort. Patients often notice the vision loss while engaged in normal activities. The typical presentation is commonly characterized by no prior warning signs, leading to immediate concern regarding the severity of the visual impairment.

Gradual vision loss, painful vision loss, and diplopia are not typical symptoms associated with central retinal artery occlusion and usually indicate different underlying conditions. Hence, the correct understanding of CRAO's symptoms focuses on the sudden and painless aspect of the vision loss experienced by patients.