What condition may require immediate referral to a specialist?

Sudden visual loss is a condition that requires immediate referral to a specialist because it can indicate a serious underlying issue that needs urgent medical attention. This could involve conditions such as retinal detachment, stroke, or other critical eye conditions that, if not treated promptly, could lead to permanent vision loss. Rapid intervention in these cases is crucial for the possibility of recovery and preservation of eyesight.

In contrast, a dry eye condition, regular eye fatigue, and allergic reactions, while uncomfortable and requiring management, do not typically pose immediate threats to vision and can often be addressed through more conservative treatment measures or routine care. These conditions, while they may need attention, do not carry the same urgency as sudden visual loss.