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Were they precribed to you by an optician? If not, chances are they will not fit your eye properly. Contact lenses are made with specific measurements and an optician will give the one that matches your eye best. You can get prescription coloured contact lenses, and you should only really wear lenses at all if you have been advises on wearing, inserting & removing lenses, and cleaning & hygine by a professional optician. Not doing this can lead to horrible eye infections and problems.