Omega-3 fatty acid found in fish-derived supplements and commonly used to treat dry eye disease is no more effective than placebo at alleviating the condition, a new clinical trial shows. Dry eye disease is an often chronic condition that causes burning, itching, or stinging sensations in the eye, as well as impairs vision.

The study results refute the long-held belief that EPA and DHA -- types of Omega-3 -- reduce dry eye symptoms.