You will need a prescription if you plan on buying pink contact lenses.
A few years back the FDA changed the law so that now you have to get a valid prescription from your eye care specialist, or doctor, if you want to get any kinds of contact lenses whatsoever, whether they are vision correcting or just plano colored contacts for theatrical purposes.
This is because they are now considered to be “medical devices” instead of just accessories. This was mostly done since these contact lenses will be in your eye, they don’t want just anybody to be able to sell them. This is so there is some accountability if something goes wrong.
If you you wear broken or torn, or poorly made contact lenses then you can damage your eye, and if just anyone is allowed to sell pink contacts then the chance of this happening is much more common.
You used to be able to find colored contacts for your eye just about anywhere. A convenient store, the flea market, but since this law has passed the only way to get them is to visit a license eye care specialist and have them give you a prescription.
The good news is that it is easy and inexpensive to get the prescription so as long as you plan a little ahead you should have no problems in finding the perfect pink contact lenses.
You can view the exact FDA law by visiting this link.