Ocular Rosacea Eye Infection From Your Contacts
CONTACT LENS ASSOCIATED EYE INFECTIONS
Microbial keratitis, with or without associated conjunctivitis and/or iritis, associated with contact lens use has become an increasingly important problem in recent years. Somewhere between a third and two thirds of cases of ulcerative keratitis are contact lens related.
The increased frequency is largely a function of increasing usage, with contact lens usage having increased by about twenty times in the last twenty years, but also relates to the advent, and increasing popularity, of extended wear varieties and practices. People who wear soft contact lenses for 24 hours or less at a time but sleep with them in are more than three times as likely to develop corneal infection than those who take them out at night, while those who wear them for more than 24 hours at a time are more than 18 times as likely. Estimated annual incidence per 10,000 users is 1 for daily wear rigid gas permeable lenses, 4 for daily wear soft lenses and 20 for extended wear soft lenses.
Symptoms of bacterial keratitis usually present acutely (within 24 hours) and include pain, photophobia, tearing, purulent discharge and reduced vision. Early in the course of the disease, a whitish to yellow stromal infiltrate develops under an epithelial defect in the presence of anterior chamber reaction and conjunctival injection. This progresses to stromal and epithelial oedema, anterior chamber reaction, hypopyon and, eventually, stromal necrosis. Often, Gram negative bacteria induce an immune precipitate (Wessely ring) to form around the nidus of infection.
A variety of organisms can be involved but the most commonly isolated organisms are Serratia, Pseudomonas and Acinetobacter (from contaminated sterilising and washing solutions) and staphylococci (from direct handling of lenses).
2001 by wordnet.com.au.
Microbial keratitis, with or without associated conjunctivitis and/or iritis, associated with contact lens use has become an increasingly important problem in recent years. Somewhere between a third and two thirds of cases of ulcerative keratitis are contact lens related.
The increased frequency is largely a function of increasing usage, with contact lens usage having increased by about twenty times in the last twenty years, but also relates to the advent, and increasing popularity, of extended wear varieties and practices. People who wear soft contact lenses for 24 hours or less at a time but sleep with them in are more than three times as likely to develop corneal infection than those who take them out at night, while those who wear them for more than 24 hours at a time are more than 18 times as likely. Estimated annual incidence per 10,000 users is 1 for daily wear rigid gas permeable lenses, 4 for daily wear soft lenses and 20 for extended wear soft lenses.
Symptoms of bacterial keratitis usually present acutely (within 24 hours) and include pain, photophobia, tearing, purulent discharge and reduced vision. Early in the course of the disease, a whitish to yellow stromal infiltrate develops under an epithelial defect in the presence of anterior chamber reaction and conjunctival injection. This progresses to stromal and epithelial oedema, anterior chamber reaction, hypopyon and, eventually, stromal necrosis. Often, Gram negative bacteria induce an immune precipitate (Wessely ring) to form around the nidus of infection.
A variety of organisms can be involved but the most commonly isolated organisms are Serratia, Pseudomonas and Acinetobacter (from contaminated sterilising and washing solutions) and staphylococci (from direct handling of lenses).
2001 by wordnet.com.au.
posted by Nick Riley at 8:48 AM
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