If used properly, contact lenses are safe for your eyes. However, there are risks involved with contact lens wearers. The most common is the failure to comply with your maintenance plan (such as wearing your contact lenses too long, not cleaning them properly, etc.). Overuse of contacts can cause eye irritation or infections that can have long-term effects on your vision. Royal Optix urges you to follow all instructions carefully and to contact us immediately if you suspect a problem with your contact lenses.