Short answer: Contact lenses are safe for the vast majority of people when used correctly. But they are not without risk, and those risks are cumulative. Long-term wear, particularly with poor hygiene habits or extended wear schedules, increases the lifetime probability of serious complications including corneal infection, chronic dry eye, and meibomian gland damage.
This question is central to the Eye Health and Vision Care hub’s comparison of correction approaches. Here is an honest summary.
What Long-Term Contact Lens Wear Does to the Eye
Microbial keratitis (corneal infection): The most serious contact lens complication. The annual incidence for daily soft lens wearers is approximately 1 in 2,500. For extended-wear users (sleeping in lenses), it rises to approximately 1 in 500. Over forty years of contact lens use, the cumulative probability of at least one significant corneal infection is meaningful.
Risk factors that substantially raise individual risk:
- Sleeping in lenses not designed for extended wear
- Swimming or showering while wearing lenses
- Poor hand hygiene before lens insertion or removal
- Inadequate lens case cleaning (replacing solution instead of discarding and replacing the case monthly)
- Wearing lenses past their replacement schedule
Even a single moderate corneal infection can leave permanent scarring that reduces visual acuity.
Corneal hypoxia: The cornea requires oxygen, delivered through the tear film from the atmosphere. Contact lenses reduce oxygen transmissibility. With older hydrogel (HEMA) lenses, chronic hypoxia was common, leading to superficial corneal neovascularization — growth of new blood vessels into the normally avascular cornea. Modern silicone hydrogel lenses have dramatically higher oxygen transmissibility and have largely eliminated this problem for daily wearers — but extended-wear protocols and overwear still create hypoxia risk even with modern materials.
Meibomian gland damage: Perhaps the most underappreciated long-term consequence of contact lens wear. Multiple studies using meibomian gland imaging (meibography) have found that long-term contact lens wearers have higher rates of meibomian gland dropout — permanent, irreversible loss of gland tissue — than non-wearers. Meibomian glands produce the lipid layer of the tear film that prevents evaporation. As gland tissue is lost, chronic evaporative dry eye worsens progressively. This matters for long-term ocular comfort and, critically, for future surgical candidacy. See dry eye syndrome and vision correction surgery for how meibomian gland health affects LASIK eligibility.
Daily Disposables: Lower Risk Profile
Daily disposable contact lenses — worn once and discarded each evening — have the best safety profile among contact lens types. Eliminating lens cases, solution, and the deposit buildup that occurs with multi-wear lenses removes several of the risk vectors for infection and ocular surface irritation. If you wear contacts, daily disposables are the safest modality for long-term use.
Contact Lenses vs. Surgery: The Risk Comparison
For patients who are surgical candidates, it is worth knowing that published estimates of vision-threatening events compare the cumulative risk of contact lens wear over five or more years to the risk of a single LASIK procedure. These comparisons generally find the cumulative contact lens risk to be comparable to or higher than surgical risk in well-screened patients.
This does not mean surgery is right for everyone. It does mean the intuitive assumption that “contacts are safer than surgery” is not straightforwardly true when viewed across a lifetime of wear. For a full comparison, see contact lenses vs. surgery: a long-term health perspective.
When to Consider Evaluating Surgery Instead
Consider a surgical consultation if:
- You have been wearing contacts for more than ten years and notice dry eye symptoms that interfere with comfortable wear
- You have had any contact lens-related corneal issues
- Your optometrist has noted neovascularization or significant meibomian gland changes
- You are tired of the dependence and cost of ongoing lens use
Related Questions
- Can Dry Eyes Be a Sign of Something Serious?
- Can Allergies Affect Vision Correction Surgery?
- How Often Should I Get My Eyes Checked?
*All content is for educational purposes. Consult a qualified eye care professional for personalized guidance on contact lens use and surgical candidacy.*