In the section of the dialog, you can enable features that help people with impaired vision.
Turning on enables high contrast black and white icons in the GNOME desktop.
Turning on enlarges the font used in the user interface.
Turning on enables a screen magnifier. You can set the desired magnification and magnifier behavior, including color effects.
By customizing the you can increase the visibility of the mouse cursor.
If the is turned on, any UI element or text that receives keyboard focus is read aloud.
If the are turned on, a sound is played whenever Num Lock or Caps Lock are turned on.