Researchers stated that the chemicals may have come from the coloring used to tint and create patterns on the contact lenses. Their study also found that these imprints of colors on the lenses contained uneven surfaces which they noted could scratch the eyes, in turn allowing bacteria into the eye causing infection and in some cases even blindness.

Costume contacts safety guidelines

In order to safely wear decorative contacts during Halloween or when dressing up throughout the year, the American Academy of Ophthalmology recommends following these guidelines.

1. Buy approved products

Buy FDA-approved products from retailers who require a prescription. If you do not have a contact lens prescription, obtain a valid prescription from your eye care professional.

2. Use a current prescription

If you have 20/20 vision, a contact lens prescription allows them to fit the contact lens to your eye, minimizing the risk of eye infection and bacterial buildup.

3. Pay attention to eye infections

Any swelling, redness, excessive discharge, or pain can be a sign of eye infection. If any of these symptoms are noticed, see an ophthalmologist immediately. Eye infections can cause blindness if left untreated.

Sources: All About Vision, AAO, AOA, Glaucoma.org, NIH.gov