Eye contact lens, also called contacts, are small round and quite rigid lenses that sit on the eyes. The size of the lens is exactly round in shape to the pupil of the eye that makes it unnoticeable. The lens actually floats on the layer of clear liquid that also keeps itself clean and clear. Not all contact lens are used for eye deterioration concerns but many use them as a fashion to have a different color of eyes for the eye care.
Most lenses now come with a pale tint of color which matches the background tint of the eye and not quite noticeable when they are being worn but this tinted color does help to user to find them when soaking in the pot or if it were accidentally dropped.
But why do people wear them? Maybe it is just a fashion of not wearing any spectacles but practically these lenses do not get smoky or steamed up during rains or a change in atmosphere like the normal glasses do for eye care. Some people may not be able to wear them because of having dry eyes but again this could be ruled out by using some lubricating eye drops for the contact lenses.