If you have trouble reading text, seeing specific colors, or making out things on the screen, Chrome OS has accessibility features bursting at the seams designed to help you. You can manage them individually from the system menu or the Settings app to use on everyday tasks.
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How to View Accessibility Features
The easiest way to enable/disable each accessibility feature without having to open up the Settings app each time is directly from the system menu. This is off by default, so you’ll need to toggle it on first.
First, click on the clock to open the system menu and notification tray; then click on the Settings icon.
Scroll to the bottom and click “Advanced.”
Scroll a little bit further until you see the Accessibility section, and then toggle “Always show accessibility option in the system menu” to the On position.
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Source : A Guide to Your Chromebook’s Accessibility Features