With chronic migraines, she avoided light for 18 months — and developed a condition from centuries past

In 2017, Karen Porter mentioned something unusual at a routine neurology appointment: Everything she saw appeared to be vibrating.

The 57-year-old U.K. resident has chronic migraines, and over the past few years had become increasingly sensitive to light; her house was almost completely blacked out, except for a dim camping light. In low light, she’d noticed the startling change in her vision. 

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