To the Editor: Extended-wear silicone hydrogel contact lenses allow the convenience of 24-hour correction of refractive error and freedom from cleaning solutions and storage containers. However, they are associated with an increase in the risk of microbial keratitis when worn overnight compared with daily wear.1-5
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- Royal Adelaide Hospital, Adelaide, SA.
Correspondence: john.landers@bigpond.com
- 1. Stapleton F, Edwards K, Keay L, et al. The incidence of contact lens related microbial keratitis in Australia [abstract]. Invest Ophthalmol Vis Sci 2005; 46: B228. Abstract No. 5025.
- 2. Morgan PB, Efron N, Hill EA, et al. Incidence of keratitis of varying severity among contact lens wearers. Br J Ophthalmol 2005; 89: 430-436.
- 3. Holden BA, Sankaridurg PR, Sweeney DF, et al. Microbial keratitis in prospective studies of extended wear with disposable hydrogel contact lenses. Cornea 2005; 24: 156-161.
- 4. Lam DS, Houang E, Fan DS, et al; Hong Kong Microbial Keratitis Study Group. Incidence and risk factors for microbial keratitis in Hong Kong: comparison with Europe and North America. Eye 2002; 16: 608-618.
- 5. Schein OD, McNally JJ, Katz J, et al. The incidence of microbial keratitis among wearers of a 30-day silicone hydrogel extended-wear contact lens. Ophthalmology 2005; 112: 2172-2179.
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