To escape the excruciating pain of migraines, Karen Porter blacked out her entire home and didn't leave for 18 months.

The lack of light helped the pain go away, but left the UK resident with a rare health condition, miners' nystagmus, a vision problem where the eyes become light-sensitive and vibrate, causing everything in a person's vision to also look like it's vibrating.

In a February 23 case report in the journal Annals of Internal Medicine, Porter's doctors explained how they were able to diagnose and treat the 57-year-old's condition, which was coined in the late 1800s when coal miners who spent most of their time underground in the dark developed it.

Migraines are common, affecting one billion people globally, but Porter's methods for relieving pain were extreme, Diego Kaski, the neurologist who treated her, told Stat News.

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