Celebrity-backed devices promise meditative ‘sober trips’. Researchers are studying how rhythmic light reshapes visual experience and mood.

Each year, thousands of stroke survivors are left with hemianopia, a condition that causes loss of half of their visual field (the “vertical midline”). Hemianopia severely affects daily activities ...

Suddenly you can’t see to one side. It’s not that your left eye (or right) has stopped working entirely. It’s that you lose half of the visual field in both eyes. It’s like wearing glasses with a half ...