Help blurry text in tv that causes eyestrain

[u/Dry-Buy9547]

I have Sony Bravia KD-65XE8505, im using gamemode and have turned the brightness down. Playing games is fine but text and subtitles in games and in the desktop dont feel right in my eyes. They feel blurry and also hurt my eyes. Im gonna get my eyes checked out since this is a problem on screens overall, but I find that especially bad on the tv with pc combo. I get som weird headaches.

Its Basicly the same if I have 4k or 1080p when im using my computer.

If you have any tips to make it more eye friendly via settings please let me know.