Canthaxanthin Retinopathy: A Long-term Observation
Canthaxanthine is a naturally occurring carotenoid that has been a popular over-the-counter oral artificial tanning agent in Europe, Canada, and Australia since 1979. It is also used at low dosage as a food-colouring agent and as a therapeutic agent for photosensitivity disorders such as erythropoietic protoporphyria. Canthaxanthin retinopathy was first described in 1982 by Cortin et al. In Germany the office of the federal board of health refused the permit for oral tanning agents containing canthaxanthine in 1985. At that time the long-term course of the disease was not known. 25 years later the investigators did these long-term follow-up examinations.
|Study Design:||Observational Model: Case-Only
Time Perspective: Prospective
- all eye diseases [ Time Frame: 2008 and 2009 ] [ Designated as safety issue: No ]All patients will have the follow-up examination 2008 or 2009. The examination included at most visual acuity (distant and near vision), Amsler test, examination of anterior segment, posterior segment, 10-2 and 30-2 visual field, electrooculography, electroretinography, multifocal electroretinography, fundus photography, fluorescein angiography, and an examination for autofluorescence.
|Study Start Date:||December 1983|
|Study Completion Date:||May 2010|
|Primary Completion Date:||December 2009 (Final data collection date for primary outcome measure)|