Blindness risk to contact lens users
Friday 16 July 1999
People who wear soft contact lenses for more than 24 hours have a 20 times greater risk of microbial keratitis, in which the cornea, the transparent surface layer of the eye, becomes infected with bacteria, fungi and amoebae, according to Dutch researchers writing in The Lancet.
They conclude: "Use of contact lenses can lead to profound and permanent visual loss in otherwise healthy eyes. The main risk factor for corneal infection is overnight wear."
John Dart, a consultant ophthalmologist at Moorfields Eye Hospital, London, says in a commentary in the journal that the recent lifting of restrictions on extended wear lenses because of improvements in lens materials, may be premature.
Microbial keratitis is rare, affecting just over one person per 10,000 contact-lens wearers a year, but can lead to permanent blindness. The type of lenses and the method of wearing them can significantly affect the chances of getting the disease.
The research found the incidence of microbial keratitis was 1.1 per 10,000 wearers per year for rigid gas permeable lenses, and 3.3 for soft lenses worn for less than 24 hours. Among those who wore soft lenses for over 24 hours the incidence was almost 20 times higher.
- 1 President of Argentina adopts Jewish godson to 'stop him turning into a werewolf'
- 2 Downfall of Dustin 'Screech' Diamond, the 'Saved By The Bell' star charged with bar stabbing
- 3 The 'Black Museum': After 150 years, public set to see exhibits from police’s grisly crime museum
- 5 Sir Winston Churchill’s family begged him not to convert to Islam, letter reveals
President of Argentina adopts Jewish godson to 'stop him turning into a werewolf'
Downfall of Dustin 'Screech' Diamond, the 'Saved By The Bell' star charged with bar stabbing
Syrian teenager Usaid Barho reveals how he escaped from Isis using a suicide vest
Sir Winston Churchill’s family begged him not to convert to Islam, letter reveals
UK weather: 'Coldest night of the year' tonight as freezing temperatures plummet to -10C
Millions of Britons struggling to feed themselves and facing malnourishment
British actor Idris Elba cannot star as James Bond because he is black, says shock jock Rush Limbaugh
Ukip member gets into Christmas spirit with Union Flag plea to Santa 'for our country back'
Germany anti-Islam protests: 17,000 march on Dresden against 'Islamification of the West'
Nigel Farage: Ukip leader named 'Briton of the year' by The Times
Douglas Carswell tells Ukip to stop blaming foreigners as youth poll shows Nigel Farage is even less popular than Nick Clegg
£13000 - £17000 per annum: Recruitment Genius: Junior Property Manager in a yo...
£20000 - £25000 per annum: Recruitment Genius: A fantastic opportunity has ari...
£22000 - £28000 per annum: Recruitment Genius: A fantastic opportunity has ari...
£20000 - £23000 per annum: Recruitment Genius: Our client is a global marketin...