Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Contact lenses are safe when used correctly, but poor hygiene can cause serious, sight-threatening eye infections. A few simple rules keep your eyes safe.
Never sleep in lenses unless they are approved for it
Never use water or saliva — only fresh lens solution
Replace lenses and the case as directed; do not "top up" old solution
Remove lenses and swim/shower without them where possible
When to see a doctor urgently
A red, painful eye with blurred vision or light sensitivity in a lens wearer — remove lenses and get urgent care (possible corneal ulcer)
Persistent discomfort or a feeling something is in the eye
Do not wear lenses over their replacement schedule
A painful red eye in a lens wearer is urgent. Contact-lens-related corneal infections can threaten sight and progress fast — remove the lenses and seek same-day eye care for a painful red eye. MedDroid gives general information, not a diagnosis.
Frequently asked questions
How do I avoid eye infections from contact lenses?
Wash hands first, never sleep in lenses (unless approved), never use water/saliva, use fresh solution each time, replace lenses and case on schedule, and avoid water while wearing them.
Can I sleep in my contact lenses?
Only if they are specifically approved for overnight wear. Sleeping in daily lenses greatly raises the risk of serious infection.
When should I remove my lenses and see a doctor?
Immediately for a red, painful eye with blurred vision or light sensitivity — this can be a corneal ulcer, a sight-threatening emergency.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.