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Disposable contact lens use as a risk factor for microbial keratitis
C F Radford1, D C Minassian, J K Dart
1Moorfields Eye Hospital, London.
The British Journal of Ophthalmology
|January 30, 1999
Summary
Disposable soft contact lenses (SCL) pose a higher risk of microbial keratitis compared to non-disposable lenses. This increased risk is linked to wear patterns and hygiene practices, highlighting potential complacency in fitting and use.
Area of Science:
- Ophthalmology
- Microbiology
- Public Health
Background:
- Microbial keratitis is a significant cause of vision loss.
- Soft contact lens (SCL) wear is a known risk factor for microbial keratitis.
- Understanding specific SCL wear modalities contributing to risk is crucial for prevention.
Purpose of the Study:
- To evaluate soft contact lens (SCL) wear modality as a risk factor for microbial keratitis.
- To identify specific SCL use habits associated with an increased risk of microbial keratitis.
Main Methods:
- A case-control study was conducted at Moorfields Eye Hospital.
- Contact lens wearers presenting to the emergency department were surveyed.
- Multivariable logistic regression analysis was used to calculate odds ratios for microbial keratitis risk.
Main Results:
- Disposable SCL wear, both daily and extended, showed a substantially increased risk compared to non-disposable SCL.
- Odds ratios for disposable SCL were 3.51 for daily wear and 4.76 for extended wear.
- Occasional overnight wear, chlorine-based disinfection systems with poor case hygiene, and irregular disinfection were also significant risk factors for daily wear users.
Conclusions:
- Properties of some disposable SCL may contribute to increased microbial keratitis risk.
- Complacency among patients and practitioners regarding disposable SCL fitting and use may be a significant factor.
- Improved adherence to hygiene protocols and appropriate SCL selection are essential for reducing microbial keratitis incidence.