But when you’re viewing your monitor in a well-lit room, your screen also reflects light. That’s why when you read white text on a dark background in a dark room, it’s easier to read than in a well-lit room. Developers often work in dark, dim rooms. That’s why coding apps use white text on a dark background to make it easy on theirs eyes. In my case on the screen I have a black background and white text, but on the paper I've got it inverted, just normal black text on white paper!!!!! All works just fine. The only thing left is to figure it out how to make it default.

I'm age 97 and have had an Apple computer of one size or another for quite a few years. My previous one was a 27 inch 'Lion.' My eyesight is still pretty good with tri-focals for regular use and bi-focals prescribed for computer viewing, and I have little trouble except for very small print like newspaper type especially when in light colors (a dumb idea) and I was led to believe by the advance hype that the new Apple Yosemite would be great for reading on-screen text. So as soon as the Yosemite came on market I bought (at a cost of about $2800) one of the early 27 inch Yosemite models and what a mistake that was. The text had more resolution but they got that by making everything much smaller. I had to go to the least resolution available on the scale menu in order to read it at all and I still have to do so when not online or wenj using the Apple Safari browser. After a frustrating year of experimentation I finally switched from Safari to the Google Chrome browser and it helped a great deal because the Google Chrome browser has an extension which allows one to go through a range of color modifications.

The best option I found on it was the switch to High Contrast which makes the raised contrast on the Apple display option look like a joke. On the Google Chrome browser it also makes all the texts look bigger and as if they were all in BOLD.

I have recently upgraded the Yosemite system to the new El Capitan at no cost which also helps some, but by and large I would say the trouble I have had with Yosemite from the beginning is inexcusable for Apple. In my view it certainly wasn't ready for prime time. For those having the same problems I did, I suggest trying the Google Chrome browser which does have a few bugs of it's own but in my case it made considerable improvement in my use of all the computer's features when online. Unfortunately when offline I still have to wrestle with almost invisible texts when viewing some of the built-in apps. Why can't Apple just give us an option to make all the texts stand out in BOLD like Google has done with their High Contrast extension? There is an option to enable a high-contrast view in OS X Mountain Lion. It is however, a global effect, so you can't modify specific regions.

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To enable a high contrast mode: > On the Dock, click Settings > In Settings, click on Accessibility (System Section, second icon from right) > Select Display from the list on the left side > Ensure the Invert Colors checkbox is checked. This setting will invert the colours on your screen: Black becomes white, white becomes black, blue goes to orange, green goes to purple. I'm not sure if it's the solution you're looking for, but it should help you increase readibility in some cases. If it does work for you, and you don't want to use it all the time, you can place a shortcut to the options in the menu bar: > On the Dock, click Settings > In Settings, click on Accessibility (System Section, second icon from right) > At the bottom of the window, select the Show Accessibility status in menu bar checkbox. Hope this helps you out!

There is an option to enable a high-contrast view in OS X Mountain Lion. It is however, a global effect, so you can't modify specific regions. Video player for mac .swf. To enable a high contrast mode: > On the Dock, click Settings > In Settings, click on Accessibility (System Section, second icon from right) > Select Display from the list on the left side > Ensure the Invert Colors checkbox is checked. This setting will invert the colours on your screen: Black becomes white, white becomes black, blue goes to orange, green goes to purple.