Just this evening I realized I couldn’t find a way to adjust the contrast on my iMac and so I scanned the Internet in search of an answer and found this great shortcut:
To increase contrast setting: control+option+command+. (period)
To decrease contrast setting: control+option+command+, (comma)
– forboy1965

This is a good tip. I’ll be using it as the MacMost quick tip of the week! Thanks.
Glad to be of help for a switch Gary.
Thank you, Thank you! This tip is really significant and long overdue for my comfort with the Mac screen!