OK, my vision is not what it used to be. Even though my 2012 iMac has a great display (non-retina) things are looking a little fuzzier than in days past. But, OS X El Capitan and Yosemite to the rescue, just had to bump up the Contrast a little.
Accessibility System Preferences
If you are in the same boat as I am with the vision thing then just do this. Go into Accessibility in System Preferences and click on Display:
Then, toggle the Increase Contrast to “On” and you will see some very noticeable differences in how your apps and OS look.
Here is the top menubar area of Safari:
You can see the increased contrast on the borders for each menu item. Not a big deal, but a nice touch for visibility. Here is the General Preferences area of Safari:
The drop downs are hilited, but they have that darker blue color scheme as well. I really like that, so much easier to see. Speaking of the dark blue menu items here is a menu in PathFinder:
Menu items are really pronounced, very seeable. I would say that the Contrast improvements are a little more pronounced in Apple apps, but depending on how much third party apps interact with OS X, they have improvements as well.
If you need a little boost in seeing your Mac I highly recommend just upping the Contrast. It is easy to do and if it is not your thing just turn it back off again.