There are many ways to protect your eyes. but forming a good habit is the most important thing. You need to pay attention to eye hygiene, don't play computer games for a long time, wear a pair of sunglasses when you are in the outside if it is too hot. And there are many foods that you can eat to provide your eyes with enough nutrients. I think the best eye care product is what we eat daily. If you are not picky, you can get enough nutrients from food, then you can have good eyesight.
Our eyes need many kinds of nutrients. Though there are many products sold in many shops that said they are good for our eyes. But I think there isn't best eye care product that you can find in any shops. You can only provide your eyes with all kinds of nutrients day by day. And when we are getting older, our organ can't digest all nutrients, so our eyes will degenerate and our eyesight will decrease. This is a common phenomenon. But don't worry. It happens to everybody, so why not accept this natural phenomenon?