Before you choose colored contacts, be mindful of these key factors:
Although there are different-sized lenses to fit most wearers, there will be some occasions (such as during blinking) where the colored portion may slide somewhat over the pupil. This creates a less-than-natural appearance, particularly when wearing opaque color contacts.
Also, the size of your pupil is constantly changing to accommodate varying light conditions — so sometimes, like at night, your pupil may be larger than the clear center of the lens. In these instances, your vision may be affected slightly.