Well, as a matter of fact, I quite understand your curiosity. Anyway, colored contact lenses are different from clear contacts in that their rim is colored, and it does not impede our vision, you still have the ability to see things clearly with contact lenses and they provide visual aids to you. I find them really amazing but there are some setbacks and side effects.
Of course, you can see through the colored contact lenses. The colored contact lenses can be used as the eyeglasses which may offer you the opportunity to see things clearly. That is why a lot of people with prescription now wear the colored contact lenses to help them for the vision. At the same time, it will make them look beautiful.
As we all known, a contact lens, or simply contact, is a lens placed on the eye. At first, contact lenses don't have any colors but white and light blue. With the technology development and cultural spreading, colored contact lenses begin to come into being. Now we can see more and more people who wear colored contact lenses, especially stars, for instance, Brad Pitt wears blue contact lenses. Tim Minchin also wears blue contact lenses on stage. Well, your confusion is really not confusion. You can see through the colored contact lenses indeed. On the contrary, colored contact lenses even can adjust your vision. For those with certain color deficiencies, a red-tinted "X-Chrom" contact lens may be used. Corrective contact lenses are designed to improve vision, most commonly by correcting refractive error. Meanwhile, most people chose colored contact lenses just for a cosmetic contact lens is designed to change the appearance of the eye.