How to reduce display contrast in OS X 10.10

I just updated to OS X 10.10 and found that the display is too bright and has too high contrast for my eyes. In fact, I can barely look at the screen without hurting my eyes since I am already sensitive about looking at lights. I reduced the brightness as much as can reasonably be reduced to, but the contrast is still too high to look at. If I reduce the brightness any further, the content becomes too dark to read or see. Even with Brightness at one bar, the screen is glaring at me. In Accessibility there is an option to increase contrast, but none to decrease it. Please help.
Moreover, I must mention here that it was quite impossible to find the appropriate Community to post this question to, I don't know why.

You would start up with the Mac OS X Installation CD. Run the installer. Select the option to "erase and install."
If you want to erase the old data more "securely," from the first Installer screen, go to the Installer menu and run Disk Utility. Select the hard drive. Go to the Erase tab. I haven't use 10.2 in a while, but hopefully there's a button there for Options. If so, select the option for Zero out data. That writes zeros to all sectors. Then quit Disk Utility and proceed with the installation.

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