A study from the University of Waterloo found that Eyeliner application may cause eye problems since there's a higher risk of contamination and vision trouble. Aside from bacterial contamination from the pencil/gel/brush/pot itself, tiny eyeliner particles that get into the eye to cause redness and irritation. Worse, when eyeliner builds up on contact lenses this can lead not only to irritation, but to blurred vision or infection.
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| From Beautylish.com's How to Tightline Eyes |
