Harrison I am not familiar with that type of phone. Is the cause of your eyestrain an upgrade of the OS or of some apps? I am curios if it is similar to what happened to my Android phone last month.
I factory reset it. After that, I downloaded only two apps and did not update any stock app. I have used it little since. I feel it is not like before the issue, so I am a bit confused about what happened, but it is definitely smoother than after the upgrade. I am tempted to re-update everything and see if the strain comes back strong, but I am kinda tired of all these tests...
I found the contact of the developer of the app which I suspect of. It is...Google! But no reply. I shall probably say "But of course no reply".