What is the hallmark symptom of a detached retina?

The hallmark symptom of a detached retina is sudden flashes of light. This occurs due to the retinal cells being stimulated as the retina detaches from its underlying layer, leading to sensations of light or flashes that may not correspond to actual visual stimuli in the external environment. This symptom often presents along with other manifestations such as sudden vision loss or the perception of floaters, but the characteristic flashing lights are particularly notable as they can serve as an early warning sign of the severity of the condition.

Patients may experience these flashes intermittently, and they might perceive them as brief bursts of light akin to electrical sparks or lightning. It is crucial to recognize these symptoms as they can indicate an urgent issue that requires immediate medical attention to potentially restore vision and prevent permanent damage.