Halos around lights (Medical Symptom)

Possible causes of Halos around lights (Medical Symptom)

A visual perception of halos occurring around a light source

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Music: 'Undaunted' Kevin Macleod CC-BY-3.0
Source/Images: "Halos around lights" CC-BY-2.5 https://www.freebase.com/m/06_mrn4