Long-term contact lens use is generally safe, when used properly, but it does carry significant risks and potential complications, especially with poor hygiene or overuse.
Eye Infections:
- Most serious risk—can lead to corneal ulcers and even vision loss
- Caused by bacteria, fungi, or amoebas (e.g., Acanthamoeba keratitis)
- Risk increases with overnight wear, poor cleaning habits, or extended wear lenses
Reduce oxygen supply:
- Contacts reduce the amount of oxygen reaching the cornea
- Over time, this can lead to corneal swelling, blood vessel growth into the cornea, or corneal thinning
Dry Eye Syndrome
- Contacts can disrupt the tear film, causing chronic dryness, irritation, and blurry vision
- Long-term wearers often experience worsening symptoms over time
Corneal Abrasion:
- Contacts can scratch the surface of the eye if inserted incorrectly or if debris gets under the lens
- Even minor abrasions can increase the risk of infection
Contact Lens Intolerance
- Some users develop intolerance over time—eyes become red, irritated, or unable to wear lenses for more than short periods
- This can result from long-term inflammation or immune response
Other Risks:
- Giant Papillary Conjunctivitis (GPC): an allergic reaction on the inner eyelids from lens wear
- Poor night vision or halos if lenses don’t sit properly
- Lens overwear: wearing lenses longer than recommended shortens their lifespan and increases risk