Decorative or cosmetic contact lenses sold without a prescription can pose a serious health risk, according to the Pennsylvania Department of Health.

The lenses are popular for Halloween, but they are also dangerous, health officials warn.

“Contacts sold without a prescription at flea markets, costume shops, beauty salons, online and other places can cause serious damage to your eyes from improper fit,” said Department of Health Secretary Dr. Eli N. Avila. “Every eye has its own unique shape and curvature, and many of these decorative lenses lack proper instruction for use.”

Contact lenses that are improperly fitted or used can cause the loss of an eye, blindness, impaired vision, corneal damage, infection and allergic reactions.

Dr. Avila urged parents to heed this warning, and consult a physician or optometrist if a child wants to wear a cosmetic or decorative contact lens.

For more information, visit www.health.state.pa.us or call 1-877-PA-HEALTH.