Two types of haloes.: The classic symptom of colored haloes around lights occurs due to corneal edema, often associated with acute angle closure glaucoma. Otherwise, white haloes around lights are usually caused by a refractive error, but any corneal surface irregularity, including dry eyes, can cause the symptom. Artificial tears are an easy treatment, and many medications, especially anxiolytics, can cause dryness.
Answered 8/28/2014
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