I don't write about eyes at all. There a reason behind it. But, I may not like to tell you the reason at all.
Here is what I'd like to mention. If your eyes get tired very quickly as compared to anyone of your friends or family members, you need to search for it online or meet a ophthalmologist - eye doctor ASAP. Or go to the glasses maker, or lab and test it yourself - if you are confident in yourself. Because the trouble is it'll soon get worse.
Use Snellen chart to test your eye sight.