What visual assessment finding should raise concern in a 75-year-old patient?

The presence of sudden flashes of light in a 75-year-old patient is particularly concerning as it may indicate a serious underlying condition affecting the retina, such as a retinal tear or detachment. This symptom is often associated with the natural aging of the eye, where changes to the vitreous can lead to these visual disturbances. In older adults, any sudden change in vision, especially accompanied by flashes, should be evaluated promptly to prevent potential vision loss.

In contrast, yellowish sclera may suggest jaundice but is less directly connected to acute vision-threatening conditions. Sluggish pupil recovery may indicate a neurological issue, but it is not as immediately alarming as sudden flashes of light. Similarly, grey eyelashes may be a normal aging change without immediate significance for vision. Thus, the sudden appearance of flashes supports a potential urgent issue needing medical attention.