They can feel similar but they're different. Eye strain is fatigue: tired, achy, dry eyes and a dull tension headache that builds during screen time and eases when you rest. A migraine is a neurological condition: often a more severe, throbbing headache, sometimes with strong light sensitivity, nausea, or visual aura, and it can strike regardless of screen use.
If rest, breaks, and better screen habits clear it up, it's most likely eye strain. If you get severe, recurring headaches with light sensitivity, nausea, or aura, that sounds more like migraine, and it's worth seeing a doctor, because migraine has specific, effective treatments.
