Technically, you needn't see an eye doctor if you just want to buy colored contact lenses for looks. Howevver, you'd better see an eye doctor for the seek of your eye health. Even if you needn't prescription to fill contact lenses or eyeglasses, you still need a eye check because not everyone can be the candidate for wearing contact lenses. You shall know if your eye condition allow you wearing contact lenses.
Yes, you are suggested to take an eye examin first if you never worn any types of contact lenses. Because conatct lenses are not aviable for everyone. If you have some eye diseases such as glaucoma, cornea problems, you are suggested not wearing any types of contact lenses. Anyway, it is not a bad thing to take an eye exam. Good luck.
Yeah, of course. You need to consult your eye doctor and get your eyes measured before you get your colored contact lenses. Because different people need the contact lenses with different size. Moreover, you also need to know how to protect your eyes when wearing color contact lenses. Hope this helpful