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Another possible solution would be to have an eye test! It's possible you need reading glasses if your eyes get blurry, or you get headaches after a while reading - if you already wear glasses, you may need to be retested. Computer monitors are notorious for highlighting bad eyesight.
I have two 13" MBPs, both non-retina - the 3 yr old one running Mavericks is sharp and clear and I get no headaches using it with my eyeglasses. The brand new one running Yosemite, even after all the suggested "adjustments", makes me squint and my eyes get blurry and I get headaches from using it with my eyeglasses.
So do you suggest that I get two different pairs of glasses - one for normal living and using Mavericks on my older MBP; and the other pair for using my Yosemite MBP?
Should I take my two MBPs into my appointment with my eye doctor when he examines my eyes and writes this special "Yosemite" prescription?
I know that you are trying to be helpful, but there seem to be hundreds of complaints on the 'net from long time veteran Mac users about this problem. One day they have Mavericks and can read their Macs fine and the next day after "upgrading" to Yosemite, and every day thereafter they are suffering from eyestrain, headaches and frustration and work downtime. It's not an imagined problem and it can't be attributed to everyone outgrowing their present eyeglass prescription overnight.
Etan
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