Colored contact lenses come in three variants: opaque color tints, enhancement tints, and visibility tints.
These colored contacts are available in either corrective or non-corrective forms.
Eyeglasses or contact lenses that are worn only for cosmetic purposes are called Plano contact lenses or glasses. Corrective colored lenses may be used for astigmatism, near-sightedness, far-sightedness, and even for people who just want disposable lenses.
Opaque tints dramatically change the color of the eyes. Enhancement tints are prescribed to people with light-colored eyes to make their eyes look brighter and put more accents on them.
Visibility tint does not change the eye color. It only puts color to the lens so the owner may see them even when in cleaning solution. There are also theatrical lenses; those with designs. You may have eyes like those of a vampire, an alien, a fictional creature, or a witch.
Just like corrective lenses and glasses, colored lenses also need prescription. In fact, this is even applicable for Plano contact lenses. Buying contact lenses and getting fitted with a pair are two different things.
Since a contact lens is a medical device, it requires a prescription from a medical expert just like drugs. If it is not prescribed well, it may not help correct your vision.
Or much worse, it might give you more problems such as allergies or make your vision problem a lot more of a hassle. Not having the proper type of contact lenses can give you discomfort, inflammation, abrasion that can cause more damage to the cornea, swelling, and other problems that might lead to permanent eye damage.
Now how do you choose the right kind of colored contact lens? If you want to show off a bit and make people ask about your eyes, you might want to wear brightly colored contact lenses.
If you are a center-of-attention type of person and want people to notice your contacts easily, try wearing opaque color tints. If your skin is dark, use bright-colored contacts.
In case you have natural brown eyes, try wearing violet, blue, or green ones. If you wear eye makeup, wear contact lenses with a color that will stand out form your mascara and eye shadow.
But if you want a subtle change where people would only notice something new but not know exactly what has changed, you would want to try color enhancers. One option is to use an enhancer with a shade of blue. It would deepen your natural eye color and define the edges of your iris.