So this Halloween I want some coloured contact lenses so I went to a special glasses store and they sell the Halloween ones and I asked how much they were and if I just buy them, she said they are 18€ for one day and you just buy them. So I'm wondering there's no prescription, but since they are from a special glasses store and I'm only using them for around 4-5 hours even less are they safe?
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Are coloured contacts safe?