With larger high resolution monitors, application fonts have become very small. I have been looking for a way to set the default size of screen fonts but have not found any.

I am particularly interested in increasing the screen font in Kontact. I have a friend who has failing eyesight and cannot read his contact list in Kontact and cannot read emails received.

I know there are screen magnifiers but he just wants a larger default font size on the applications he uses.

Desktop fonts can be resized but that does not appear to have any effect on application input screens.

Does anyone know of a way of increasing default font sizes in applications?