I also find that david caruso often wears sunglasses. He must be just for the looks. Wearing the sunglasses will make him look so cool and fashionable. The sunglasses become the necessary part in the fashionable circle. Many people like to wear them to show the different styles to match with their clothing. If you are the fashionable one, you could try it.
First of all, sunglasses are the necessity for celebrities. Because sunglasses make them more fashionable. And they can show their tastes as well.
Then, you need know, sunglasses are also important for ordinary, because they can protect us against the UV, fluorescent light, etc.
Anyway, sunglasses are pretty helpful for everyone. Ordinary can't afford the designer sunglasses, but they can wear good-quality sunglasses with middle price.
Celebrities chase for the fashion, so they wear sunglasses more often.
I think you are very fond of that guy ,who is an American actor. From what I know, he likes to wear different kinds of sunglasses from time to time. For in that way, he appears to be more attractive and mysterious. However, when off the stage, he could also be ok without sunglasses. Of course sunglasses are not necessary for anyone of us.