Transient monocular vision loss (TMVL) is a common but diagnostically challenging presentation in Ophthalmology and emergency medicine. Two clinically important causes include retinal migraine and amaurosis fugax, which differ significantly in underlying pathology, systemic risk, and management. To provide a practical and clinically focused approach to differentiating retinal migraine from amaurosis fugax in patients presenting with TMVL. Narrative clinical review of key diagnostic features, risk factors, and investigation strategies relevant to TMVL, with emphasis on bedside differentiation. Amaurosis fugax is most commonly embolic in origin and is strongly associated with carotid atherosclerosis and cardiovascular risk factors, requiring urgent stroke pathway assessment. Retinal migraine is rare, diagnosis of exclusion condition, typically seen in younger patients with a history of migraine and reversible vasospasm. Duration of symptoms, symptom character and vascular risk profile and associated systemic features are key differentiators. Accurate distinction between retinal migraine and amaurosis fugax is essential to prevent missed cerebrovascular disease and avoid unnecessary investigations in benign cases. A structured clinical approach improved diagnostic accuracy and patient safety.