Colored contact lenses are usually used for cosmetic purposes - to alter the overall look of your eyes by changing the eye color. They can either change eye color slightly or completely. Depending on the look and effect you want, the choice is completely yours.
The first thing that needs to be decided is one's eye colour. While there are many options, the best option is to choose a colour that has a close match to one's natural skin tone. It's also preferable to choose a colour that is not too dark, as this can make the eye seem a bit yellow in tone. See source to get detailed information about the causes of sudden blurry vision.
Once the eye colour has been decided upon, the next step is to choose a shade. While it may be tempting to go for a color that is the exact same as one's natural skin tone, it may not always suit. If you decide to use dark colors, then choosing a shade of black or navy blue should provide an adequate contrast. However, if you need light shades to give your eyes a better contrast, then it might be a good idea to go for lighter shades of the same colour.
Once the eye colour and shade has been chosen, it's now time to pick a colour for the strap. It's important to choose a colour that matches the colour of the colored lens. For instance, if you have light-coloured eyes, but you have dark brown hair, then it may be a good idea to go for a brown coloured strap. On the other hand, if your eyes are dark-coloured, then go for a black strap.
Now that the coloured contact lens has been chosen, it's important to choose a style. There are many styles available and the most important thing is to choose one that will compliment your eye colour and hair color. One style that has become very popular recently is to use a single colored colour for the whole length of the strap, which provides a subtle contrast.
Color contacts can also be chosen to complement a particular outfit. For example, some people choose to wear black lenses for daytime wear, while others wear white to go to work. If you're planning to wear them on your wedding day, then it may be advisable to choose a white coloured contact so that matches the overall color of the dress. If you're a golfer or a snowboarder then opt for example, it's advisable to go with a different coloured lens that matches your sport. Check it out here for more detailed information about contact lenses: https://en.wikipedia.org/wiki/Contact_lens.