A dry eye means a lack of enough tears. As far as I know, there are various causes that could give rise to dry eyes. The most common reason is overusing of the eyes. And will finally cause eye disorder. The direct result is the image coming into your eyeballs not to get the right position on the retinal while around lights. Instead, the image comes in front of the retinal. And you will see halos eventually. To treat this situation, having a good balance between your entertainment time and rest time is the direct and effective way. Meanwhile, more diets which contain vitamin A should be available. Persist in taking above measures, a few days later, you will see changes.