If it's hard to see what's on the screen, apply a color filter. Color filters change the color palette on the screen and can help you distinguish between things that differ only by color.
To use a color filter:
Select Start > Settings > Ease of Access > Color filters.
Switch on the toggle under Turn on color filters.
Then, select a color filter from the menu. Try each filter to see which one suits you best.
Note: To get to color filter settings in previous versions of Windows 10, select Start > Settings > Ease of Access > Color & high contrast.