Turkish ophthalmologists have issued a warning about nine common habits that can damage eye health, including sleeping in contact lenses, excessive screen use, and poor hygiene, urging the public to adopt preventive measures to avoid infections, corneal ulcers, and long-term vision loss.
Why These Everyday Habits Pose a Silent Threat to Vision
Despite widespread access to eye care in Turkey and globally, preventable ocular surface diseases remain a leading cause of outpatient visits, particularly among young adults who frequently sleep in contact lenses or overuse digital devices. These behaviors disrupt the corneal epithelium, reduce tear film stability, and create anaerobic environments conducive to microbial keratitis—a sight-threatening infection that can progress to corneal perforation within 24–48 hours if untreated. The risk is amplified in regions with limited access to urgent ophthalmic care, where delays in treatment increase the likelihood of permanent scarring and vision impairment.
In Plain English: The Clinical Takeaway
- Sleeping in contact lenses increases your risk of a serious eye infection by up to 8 times, even with “extended wear” lenses.
- Staring at screens for hours without blinking dries out your eyes and damages the protective surface over time.
- Never use tap water or saliva to clean lenses—these introduce harmful microbes that can cause ulcers or blindness.
The Hidden Danger of Overnight Lens Wear: Acanthamoeba and Pseudomonas
One of the most severe risks associated with sleeping in contact lenses is microbial keratitis caused by Acanthamoeba or Pseudomonas aeruginosa. Acanthamoeba keratitis, though rare, is notoriously difficult to treat and often requires prolonged antifungal therapy or corneal transplantation. A 2024 multicenter study published in Ophthalmology found that 92% of Acanthamoeba cases were linked to improper lens hygiene, including swimming or showering even as wearing lenses. In contrast, Pseudomonas infections progress rapidly and can cause stromal melting within days, necessitating urgent fortified antibiotic drops and possible surgical intervention.
“Patients often underestimate how quickly a seemingly minor habit like napping in lenses can escalate. We’ve seen cases where healthy 20-year-olds required emergency keratoplasty after just one night of overnight wear.”
— Dr. Elif Yılmaz, Professor of Ophthalmology, Hacettepe University Faculty of Medicine, Ankara
Digital Eye Strain: More Than Just Discomfort
Extended screen use contributes to digital eye strain, characterized by dryness, blurred vision, and headaches—a condition now recognized as a public health concern by the World Health Organization (WHO). Reduced blink rate during focused screen work destabilizes the tear film, increasing osmolarity and triggering inflammation of the ocular surface. A 2023 meta-analysis in JAMA Ophthalmology reported that individuals using screens for >6 hours daily had a 41% higher prevalence of dry eye disease compared to those with <2 hours of use. While not infectious, chronic dry eye can lead to filamentary keratitis and reduced quality of life, particularly in aging populations.
Geopolitical Disparities in Eye Care Access
In Turkey, the Ministry of Health reports approximately 1.2 million annual visits for conjunctivitis and corneal abrasions, with a significant proportion attributed to contact lens misuse. However, access to timely ophthalmic care varies: urban centers like Istanbul and Ankara have well-equipped tertiary eye hospitals, while rural regions in Eastern Anatolia often lack slit-lamp biomicroscopes and corneal specialists. This mirrors global disparities—according to the International Agency for the Prevention of Blindness (IAPB), over 90% of vision impairment cases due to preventable causes occur in low- and middle-income countries, where shortages of ophthalmologists and diagnostic tools delay treatment.
| Risk Factor | Associated Condition | Relative Risk Increase | Preventive Measure |
|---|---|---|---|
| Sleeping in contact lenses | Microbial keratitis | 8x | Remove lenses before sleep; follow replacement schedule |
| Swimming/showering with lenses | Acanthamoeba keratitis | 14x | Use waterproof goggles or daily disposables |
| Screen use >6 hrs/day | Dry eye disease | 1.4x | 20-20-20 rule; artificial tears; humidifier |
| Using tap water/saliva for lenses | Bacterial/fungal keratitis | 10x | Use only sterile saline or multipurpose solution |
Contraindications & When to Consult a Doctor
Individuals with a history of corneal surgery, autoimmune dry eye (e.g., Sjögren’s syndrome), or immunocompromised states should avoid extended-wear lenses entirely. Symptoms warranting immediate ophthalmologic evaluation include sudden eye pain, photophobia, blurred vision, purulent discharge, or a foreign body sensation that persists after lens removal. Delaying care increases the risk of stromal scarring, which may necessitate corneal transplantation—a procedure with limited donor availability in many regions.
Evidence-Based Alternatives and Public Health Recommendations
Ophthalmologists recommend switching to daily disposable lenses for those who struggle with hygiene compliance, as they eliminate the need for cleaning and reduce infection risk. For screen users, the 20-20-20 rule—taking a 20-second break every 20 minutes to view something 20 feet away—helps restore blink rate and tear film stability. Lubricating eye drops containing hyaluronic acid or carboxymethylcellulose can alleviate mild dryness, but preservative-free formulations are advised for frequent use. Public health campaigns modeled after the CDC’s “Contact Lens Hygiene” initiative have shown success in reducing keratitis rates by up to 30% in targeted populations.
“Prevention is far more effective than treatment when it comes to eye infections. Simple behavioral changes—like washing hands before handling lenses or avoiding overnight wear—can preserve vision for a lifetime.”
— Dr. Tedros Adhanom Ghebreyesus, Director-General, World Health Organization (WHO), Geneva
References
- Stapleton F, et al. Risk Factors for Acanthamoeba Keratitis: A Case-Control Study. Ophthalmology. 2024;131(2):145-153.
- Wang M, et al. Digital Screen Use and Dry Eye Disease: A Systematic Review and Meta-analysis. JAMA Ophthalmol. 2023;141(5):489-498.
- Jones L, et al. TFOS DEWS II Lifestyle Report: Executive Summary. Ocul Surf. 2017;15(3):439-451.
- Centers for Disease Control, and Prevention. Contact Lens Hygiene and Compliance. CDC.gov. Updated 2023.
- World Health Organization. World Report on Vision. WHO Press; 2019.
This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.
