It is always recommended that before you purchase, and especially wear your new yellow contacts that you were properly fitted to make sure that they will fit your eyes. All eyes are different shapes so it’s not always a one size fits all situation.
If you have your eyes checked out by an eye care professional you will know what size you can wear, and that you are safe to wear them. Most yellow contacts you buy online will be medium curve, which fits about 95-98% of the population, but other factors can take a part on the exact yellow contacts you should buy and wear.
If you do have a special need for the yellow contacts you plan on wearing, you should find out first before you spend any time or money on purchasing them. If you do need a special fitting or prescription, you can find a dealer online or locally that will be able to supply you with the perfect yellow contact lenses especially for your needs.