Hi. If you're having trouble reading the font, you can edit it manually. All information and parameters related to in-game fonts are located in the font.clu file inside your client folder, in the scripts > lua directory. It can be edited with any text editor, like Notepad.
While the game doesn't support a variety of font families and some of them look pretty bad inside the game, it's worth testing some of them out, perhaps you find one which is supported, looks nice and suits you.
Another thing you can do, which might be more likely to help, is edit the font size. I've personally been playing the last year or so with a larger font size in-game and as someone with relatively bad eyesight, I do think it helped make the game more readable; especially in-game chat and character/monster names.
Note: while editing files inside the client is allowed, it's not supported. Meaning that if you run into trouble due to modifications you've made, there's no guarantee that you'll get support and you may need to run Version Check inside the client or download a clean one.
