Most Windows applications I use in my daily work (email clients, browsers, text editors) have a handy feature allowing to make the text larger by increasing (or smaller by decreasing) the font size. Increasing the text size in a web browser is something I got accustomed to doing frequently – to make the web page easier to read if the default text size was set too small for my eyes.
Even though all applications have some visual way (track bars mainly) to zoom in/out their display – all also support zooming by using (standard?) keyboard shortcuts. CTRL+Plus to increase the font size, CTRL+Minus to decrease. Am not sure if you know, but Delphi IDE unit editor also has this feature.