Well, as far as I know, Demi Lovato is one of the three female stars Walt Disney is fostering and paying attention to. And basically, she has got a poor vision ever since her teens age. However, glasses are not suitable for her face and image, therefore, she decided to wear contact lenses on a regular basis. However, sometimes she would like to make a change.
Yes. From some entertainment news, it is said that she was saw going to her optometrist to pick up some new contact lenses one day. And from the article How Your Favorite Celebrities Wear Their Colored Contact Lenses, you can also find that she has been seen sporting nifty colored lenses bought with her mom. Also you can see from an advertisement in YouTube, she is the spokeswoman of a contact brand. So I think the answer is yes.
Yes, Demi lovato wears the contact lenses. After wearing the contact lenses, she will look more beautiful. She will look big at the eyes. She will even be shining at the eyes. If you want to make the eyes show big and fascinating, you could go to the online store to buy a pair of contact lenses with cheap price to show the beauty.