The symptoms of vision problems are tired eyes, dizziness and headaches. Almost everyone with a chronic case of mild traumatic neck/brain injury has vision problems.
Many people have difficulty reading, and screen work especially is tiring. Over doing it must be avoided and time must be set aside to rest the eyes. Many people forget this when they return to work after sick leave, often full-time from the beginning. If you get headaches, nausea and dizziness from reading, and can only concentrate for a short time; you should get a function test of your vision done.