I was just 'clicking' and changed the accessibility settings on Acrobat Pro 10. Now all my .pdf s read with a faint font 0- I have lost the depth of black in the text which makes it all hard to read. This is in all .pdfs so the setting is in Acrobat but I cannot reverse or change what I have done.
If anyone can help, please do. I use Mac Yosemite on iMac and MacBookPro.