Many celebrities wear contact lenses especially if there is going to be a picture or photo of them that will be close up. They wear them because it makes their eyes look fresher and nicer. Women especially wear contacts in their eyes. Some will even wear them even if they don’t have any eye problems. Drake is known for wearing contact lenses.
In the very earliest part of his career, Drake wore glasses, so you know that there is a visual problem which would explain why he would wear contact lenses. In some pictures, his lenses make his eyes appear brown which is his natural eye color. In other pictures, his eyes appear hazel which is probably when he is wearing contact lenses.