Large doses of niacin may affect the eyes in several ways, including blurred vision, eyelash or eyebrow loss, swollen eyelids or reduced vision in one eye. A condition called cystoid macular edema (CME) may occur as well. CME is fluid build-up and swelling in the retina that can lead to cystic spaces within the eye.
Most vision problems related to niacin are reversible with early intervention.

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