New Delhi, Dec. 29 -- Have you ever felt a sudden flash of light in your vision or noticed zigzagging lines? This may occur before a severe headache, which could indicate migraines. Migraine symptoms can be different for everyone, but many people have visual disturbances called 'auras'. Migraines can cause transient visual loss or blindness, primarily due to cortical spreading depression (CSD), a wave of abnormal electrical activity in the brain's visual cortex. This activity can disrupt blood flow to the retinal vessels, causing symptoms such as shimmering lights, blind spots, or monocular vision. These symptoms usually go away as blood flow returns to normal.

Why do auras happen with migraines?

An aura is a group of sensory symptoms t...