What kind of an eye injury? If you had a cornea injury you could have a scar on your cornea causing the problem. If it is dry eye it should go away, at least temporarily, when you put in artificial tears or blink. Using any type of electronic screen and reading cause decreased blink rate and drying of the eyes. Look away from the screen each 10-15 minutes, focus across the room and blink 6-7 times firmly. You can also get a second opinion if the problem persists from another eye MD