Halloween costume contacts sold without a prescription pose serious risks to eyes. The American Academy of Ophthalmology warns against non-prescription colored contacts, which are technically illegal in the U.S. even though companies sell them.
The CDC identifies risks including "eye sores and vision loss." A 2017 FDA report found bacterial contamination in 27% of costume contacts tested.
Cheap Halloween contacts are typically one-size-fits-all, but the AAO emphasizes that contacts should never be one-size-fits-all. A contact that is too large or too small can cause corneal abrasions, corneal ulcers, and infections like keratitis. In severe cases, infections can lead to blindness.
Legitimate colored contacts require a prescription and cost $40 and up from sites like lens.com, Discount Contacts, and Wicked Eyez. These retailers require you to provide prescription information before ordering. The Federal Trade Commission has ruled that eye care providers must give you your contact prescription after a fitting at no extra charge, allowing you to shop around.
If you wear contacts, watch for redness, swelling, pain, or excessive discharge and seek care immediately if you suspect an infection. Eyes are more sensitive to infections than other body parts.
Basic care steps include washing your hands before handling lenses, storing them in contact lens solution with a clean case, and never sharing lenses with friends.