Changing Appearance or font in ElCapitan

etnad wrote:

For reasons unknown to me especially using the HTML text in my emails, and WEB forms, click boxes and so on are barely visible.

I need to keep the accessibility app at hand and "invert" colours.

I wonder if Is there a way to change the default system font in ELCAPITAN? or force the system to apply the fonts and size I like in MAILS OR WEB PAGES, no matter how they are encoded?

I'm aware that even if this was possible still check boxes forms and so on will still be faint and using the tab key not always takes me to the area I should fill up ... but at least I would be able to read what often is too faint too read.

The only options you have available to you are what are in System Preferences --> Accessibility as far as making font more readable goes. There is no way that I know of, without using a 3rd party hack (which I never advocate), to change the system font or its color.

etnad wrote:

Thanks ..... but while testing all options in Appearance I still have the same problems

I am not using Apple Monitors in my MACPRO 4.1

However the various "manual" options I find in my ASUS PB287Q allow me to change most settings

But still .....

It doesn't matter what monitor you're using. There is no way in OS X to change the color or typeface of the system font.

About the best you can do is to check these two checkboxes in the System/Accessability/Display preference pane.